{"title":"UMS Petrol Radial \u0026 Twin Engines","description":"\u003cp\u003eDiscover high-performance \u003cstrong data-start=\"298\" data-end=\"336\"\u003eUMS petrol radial and twin engines\u003c\/strong\u003e, engineered for reliability, smooth operation, and exceptional power-to-weight ratios. Ideal for scale aircraft, aerobatic models, and demanding RC applications, UMS engines are known for precision craftsmanship, authentic sound, and long-lasting performance.\u003cbr data-start=\"596\" data-end=\"599\"\u003eExplore our range of petrol radial and twin engines designed to deliver realistic operation, efficient fuel consumption, and dependable starts every time.\u003c\/p\u003e","products":[{"product_id":"ums-5-cylinder-125cc-petrol-radial-engine-4-stroke-scale-aircraft-powerplant","title":"UMS 5-Cylinder 125cc Petrol Radial Engine – 4-Stroke Scale Aircraft Powerplant","description":"\u003cp data-start=\"320\" data-end=\"682\"\u003eThe \u003cstrong data-start=\"324\" data-end=\"364\"\u003eUMS 5-125cc 5-Cylinder Radial Engine\u003c\/strong\u003e is a premium petrol-powered 4-stroke engine designed to deliver exceptional realism, smooth performance, and long-term reliability for large-scale model aircraft. With its authentic radial layout and superb machining quality, it perfectly replicates the look, sound, and operation of classic vintage aircraft engines.\u003c\/p\u003e\n\u003cp data-start=\"684\" data-end=\"980\"\u003eReady to run straight out of the box, this engine is supplied complete with an exhaust collector ring, electronic ignition system, spark plugs, carburettor, and engine mount. User-friendly choke and throttle bellcranks make installation and operation straightforward, even in complex scale cowls.\u003c\/p\u003e\n\u003cp data-start=\"982\" data-end=\"1354\"\u003eManufactured using CNC-machined aluminium and aircraft-grade alloys, the UMS 5-125 is built to exacting standards. Internally, it features a heavy-duty double-bearing crankshaft, billet aluminium pistons with hardened steel rings, hard-chromed and lapped cylinder bores, and hardened steel cams ensuring smooth running, excellent power delivery, and outstanding longevity.\u003c\/p\u003e\n\u003cp data-start=\"1356\" data-end=\"1654\"\u003eOptimised for \u003cstrong data-start=\"1370\" data-end=\"1394\"\u003e87–110 octane petrol\u003c\/strong\u003e with a \u003cstrong data-start=\"1402\" data-end=\"1425\"\u003e32:1 petrol\/oil mix\u003c\/strong\u003e, this radial engine delivers powerful thrust with dependable operation. Whether powering a large warbird, vintage replica, or custom scale project, the UMS 5-125 provides unmatched mechanical beauty, performance, and durability.\u003c\/p\u003e\n\u003ch3 data-start=\"1661\" data-end=\"1681\"\u003e\u003cstrong data-start=\"1665\" data-end=\"1681\"\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul data-start=\"1682\" data-end=\"2323\"\u003e\n\u003cli data-start=\"1682\" data-end=\"1752\"\u003e\n\u003cp data-start=\"1684\" data-end=\"1752\"\u003eStunning 5-cylinder radial configuration for maximum scale realism\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1753\" data-end=\"1808\"\u003e\n\u003cp data-start=\"1755\" data-end=\"1808\"\u003e4-stroke petrol engine with smooth, authentic sound\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1809\" data-end=\"1879\"\u003e\n\u003cp data-start=\"1811\" data-end=\"1879\"\u003eReady-to-run package including exhaust collector ring and ignition\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1880\" data-end=\"1942\"\u003e\n\u003cp data-start=\"1882\" data-end=\"1942\"\u003eUser-friendly choke and throttle bellcranks for easy setup\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1943\" data-end=\"1996\"\u003e\n\u003cp data-start=\"1945\" data-end=\"1996\"\u003eCNC-machined aluminium and bar stock construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1997\" data-end=\"2050\"\u003e\n\u003cp data-start=\"1999\" data-end=\"2050\"\u003eAircraft-grade alloy crankcase and cylinder heads\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2051\" data-end=\"2091\"\u003e\n\u003cp data-start=\"2053\" data-end=\"2091\"\u003eHeavy-duty double-bearing crankshaft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2092\" data-end=\"2146\"\u003e\n\u003cp data-start=\"2094\" data-end=\"2146\"\u003eBillet aluminium pistons with hardened steel rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2147\" data-end=\"2208\"\u003e\n\u003cp data-start=\"2149\" data-end=\"2208\"\u003eHard-chromed, lapped cylinder bores for long service life\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2209\" data-end=\"2270\"\u003e\n\u003cp data-start=\"2211\" data-end=\"2270\"\u003eHardened steel cams for reliability under sustained loads\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2271\" data-end=\"2323\"\u003e\n\u003cp data-start=\"2273\" data-end=\"2323\"\u003eBurns petrol fuel for efficiency and convenience\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"2330\" data-end=\"2349\"\u003e\u003cstrong data-start=\"2334\" data-end=\"2349\"\u003ePerfect For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul data-start=\"2350\" data-end=\"2557\"\u003e\n\u003cli data-start=\"2350\" data-end=\"2404\"\u003e\n\u003cp data-start=\"2352\" data-end=\"2404\"\u003eLarge-scale warbirds and vintage aircraft replicas\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2405\" data-end=\"2464\"\u003e\n\u003cp data-start=\"2407\" data-end=\"2464\"\u003eScale model aircraft requiring authentic radial engines\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2465\" data-end=\"2512\"\u003e\n\u003cp data-start=\"2467\" data-end=\"2512\"\u003eSerious hobbyists and professional builders\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2513\" data-end=\"2557\"\u003e\n\u003cp data-start=\"2515\" data-end=\"2557\"\u003eCustom showcase and competition aircraft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"2564\" data-end=\"2587\"\u003e\u003cstrong data-start=\"2568\" data-end=\"2587\"\u003eProduct Summary\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2588\" data-end=\"2874\"\u003eThe UMS 5-125cc radial engine combines breathtaking scale realism with modern engineering excellence. With its ready-to-run design, robust construction, and proven reliability, it is the ideal centrepiece for high-end scale aircraft projects demanding both performance and authenticity.\u003c\/p\u003e\n\u003ch3 data-start=\"2881\" data-end=\"2903\"\u003e\u003cstrong data-start=\"2885\" data-end=\"2903\"\u003eSpecifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul data-start=\"2904\" data-end=\"3484\"\u003e\n\u003cli data-start=\"2904\" data-end=\"2940\"\u003e\n\u003cp data-start=\"2906\" data-end=\"2940\"\u003e\u003cstrong data-start=\"2906\" data-end=\"2922\"\u003eEngine Type:\u003c\/strong\u003e 4-Stroke Petrol\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2941\" data-end=\"2972\"\u003e\n\u003cp data-start=\"2943\" data-end=\"2972\"\u003e\u003cstrong data-start=\"2943\" data-end=\"2957\"\u003eCylinders:\u003c\/strong\u003e 5 (ABC type)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2973\" data-end=\"3000\"\u003e\n\u003cp data-start=\"2975\" data-end=\"3000\"\u003e\u003cstrong data-start=\"2975\" data-end=\"2992\"\u003eDisplacement:\u003c\/strong\u003e 125cc\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3001\" data-end=\"3019\"\u003e\n\u003cp data-start=\"3003\" data-end=\"3019\"\u003e\u003cstrong data-start=\"3003\" data-end=\"3012\"\u003eBore:\u003c\/strong\u003e 31mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3020\" data-end=\"3040\"\u003e\n\u003cp data-start=\"3022\" data-end=\"3040\"\u003e\u003cstrong data-start=\"3022\" data-end=\"3033\"\u003eStroke:\u003c\/strong\u003e 33mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3041\" data-end=\"3073\"\u003e\n\u003cp data-start=\"3043\" data-end=\"3073\"\u003e\u003cstrong data-start=\"3043\" data-end=\"3057\"\u003eRPM Range:\u003c\/strong\u003e 1,000 – 6,000\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3074\" data-end=\"3123\"\u003e\n\u003cp data-start=\"3076\" data-end=\"3123\"\u003e\u003cstrong data-start=\"3076\" data-end=\"3095\"\u003eApprox. Thrust:\u003c\/strong\u003e 14–15kgf (with 28×8 prop)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3124\" data-end=\"3190\"\u003e\n\u003cp data-start=\"3126\" data-end=\"3190\"\u003e\u003cstrong data-start=\"3126\" data-end=\"3153\"\u003eRecommended Propellers:\u003c\/strong\u003e 26×8, 26×10, 27×10, 28×8 (2-blade)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3191\" data-end=\"3227\"\u003e\n\u003cp data-start=\"3193\" data-end=\"3227\"\u003e\u003cstrong data-start=\"3193\" data-end=\"3209\"\u003eCarburettor:\u003c\/strong\u003e Walbro \/ WT-621\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3228\" data-end=\"3273\"\u003e\n\u003cp data-start=\"3230\" data-end=\"3273\"\u003e\u003cstrong data-start=\"3230\" data-end=\"3243\"\u003eIgnition:\u003c\/strong\u003e Electronic (2S LiPo direct)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3274\" data-end=\"3298\"\u003e\n\u003cp data-start=\"3276\" data-end=\"3298\"\u003e\u003cstrong data-start=\"3276\" data-end=\"3291\"\u003eSpark Plug:\u003c\/strong\u003e CM-6\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3299\" data-end=\"3341\"\u003e\n\u003cp data-start=\"3301\" data-end=\"3341\"\u003e\u003cstrong data-start=\"3301\" data-end=\"3313\"\u003eMuffler:\u003c\/strong\u003e Collector ring (included)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3342\" data-end=\"3380\"\u003e\n\u003cp data-start=\"3344\" data-end=\"3380\"\u003e\u003cstrong data-start=\"3344\" data-end=\"3353\"\u003eFuel:\u003c\/strong\u003e Petrol with 32:1 oil mix\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3381\" data-end=\"3422\"\u003e\n\u003cp data-start=\"3383\" data-end=\"3422\"\u003e\u003cstrong data-start=\"3383\" data-end=\"3406\"\u003eDimensions (Ø x L):\u003c\/strong\u003e 265mm x 166mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3423\" data-end=\"3484\"\u003e\n\u003cp data-start=\"3425\" data-end=\"3484\"\u003e\u003cstrong data-start=\"3425\" data-end=\"3436\"\u003eWeight:\u003c\/strong\u003e Approx. 4.6kg including ignition and silencer\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"3491\" data-end=\"3529\"\u003e\u003cstrong data-start=\"3495\" data-end=\"3529\"\u003eWhy Buy from Probuild Aircraft\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"3530\" data-end=\"3723\"\u003e✅ Official UK stockist – 100% genuine UMS engines\u003cbr data-start=\"3579\" data-end=\"3582\"\u003e✅ Trusted by top international pilots and builders\u003cbr data-start=\"3632\" data-end=\"3635\"\u003e✅ Fast UK shipping and secure packaging\u003cbr data-start=\"3674\" data-end=\"3677\"\u003e✅ Supplying and supporting pilots since 1993\u003c\/p\u003e\n\u003cp data-start=\"3530\" data-end=\"3723\"\u003eManual:\u003c\/p\u003e\n\u003cp data-start=\"3530\" data-end=\"3723\"\u003e\u003ca href=\"https:\/\/ch-ignitions.com\/wp-content\/uploads\/2020\/03\/ums-gas-radial-engine-manual-9-115.pdf\" target=\"_blank\" rel=\"noopener\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/Screenshot_2026-02-04_115553.png?v=1770206937\" alt=\"\" width=\"233\" height=\"351\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"UMS Engines","offers":[{"title":"Default Title","offer_id":56309750727042,"sku":"UMS5-125","price":1832.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/UMS-5-125CC-PETROL.jpg?v=1770206514"},{"product_id":"ums-7-cylinder-360cc-petrol-radial-engine-4-stroke-scale-aircraft-powerplant","title":"UMS 7-Cylinder 360cc Petrol Radial Engine – 4-Stroke Scale Aircraft Powerplant","description":"\u003cp data-start=\"379\" data-end=\"758\"\u003eThe \u003cstrong data-start=\"383\" data-end=\"428\"\u003eUMS 7-Cylinder 360cc Petrol Radial Engine\u003c\/strong\u003e is a high-performance, 4-stroke powerplant designed for serious scale aircraft builders. Delivering breath-taking realism and smooth, powerful performance, this \u003cstrong data-start=\"589\" data-end=\"619\"\u003eready-to-run radial engine\u003c\/strong\u003e combines authentic appearance with modern engineering, making it the perfect centrepiece for large-scale RC and replica aircraft projects.\u003c\/p\u003e\n\u003ch2 data-start=\"765\" data-end=\"793\"\u003e\u003cstrong data-start=\"768\" data-end=\"791\"\u003eProduct Description\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"795\" data-end=\"1108\"\u003eThe \u003cstrong data-start=\"799\" data-end=\"837\"\u003eUMS 7-Cylinder 360cc Radial Engine\u003c\/strong\u003e is engineered to provide both \u003cstrong data-start=\"868\" data-end=\"905\"\u003etrue-to-scale visual authenticity\u003c\/strong\u003e and \u003cstrong data-start=\"910\" data-end=\"947\"\u003ereliable, high-output performance\u003c\/strong\u003e. Its classic 7-cylinder radial configuration closely replicates full-scale aviation engines while delivering smooth, balanced operation across a wide RPM range.\u003c\/p\u003e\n\u003cp data-start=\"1110\" data-end=\"1461\"\u003eWith a substantial \u003cstrong data-start=\"1129\" data-end=\"1151\"\u003e360cc displacement\u003c\/strong\u003e, this engine produces impressive torque and thrust, ideal for large warbirds, scale aerobatic aircraft, and museum-quality replica builds. Supplied \u003cstrong data-start=\"1300\" data-end=\"1316\"\u003eready to run\u003c\/strong\u003e, it includes an exhaust collector ring, electronic ignition, spark plugs, and engine mount, allowing for straightforward installation and setup.\u003c\/p\u003e\n\u003cp data-start=\"1463\" data-end=\"1873\"\u003ePrecision CNC machining from aluminium and bar stock ensures exceptional build quality. Aircraft-grade aluminium alloy cylinder heads and crankcases provide outstanding strength without unnecessary weight. Internally, a \u003cstrong data-start=\"1683\" data-end=\"1712\"\u003edouble-bearing crankshaft\u003c\/strong\u003e, billet aluminium pistons with hardened steel rings, and \u003cstrong data-start=\"1770\" data-end=\"1801\"\u003ehard-chromed cylinder bores\u003c\/strong\u003e ensure long-term durability, smooth running, and excellent compression.\u003c\/p\u003e\n\u003cp data-start=\"1875\" data-end=\"2092\"\u003eUser-friendly throttle and choke bellcranks simplify installation and day-to-day operation, while compatibility with \u003cstrong data-start=\"1992\" data-end=\"2016\"\u003e87–110 octane petrol\u003c\/strong\u003e and a \u003cstrong data-start=\"2023\" data-end=\"2044\"\u003e32:1 fuel mixture\u003c\/strong\u003e makes this engine both practical and versatile.\u003c\/p\u003e\n\u003cp data-start=\"2094\" data-end=\"2256\"\u003eDesigned for builders who demand \u003cstrong data-start=\"2127\" data-end=\"2193\"\u003eauthentic sound, scale realism, and uncompromising performance\u003c\/strong\u003e, the UMS 7-360cc radial engine is a true statement powerplant.\u003c\/p\u003e\n\u003ch2 data-start=\"2263\" data-end=\"2284\"\u003e\u003cstrong data-start=\"2266\" data-end=\"2282\"\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2285\" data-end=\"2979\"\u003e\n\u003cli data-start=\"2285\" data-end=\"2350\"\u003e\n\u003cp data-start=\"2287\" data-end=\"2350\"\u003e7-cylinder 4-stroke radial engine for unmatched scale realism\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2351\" data-end=\"2413\"\u003e\n\u003cp data-start=\"2353\" data-end=\"2413\"\u003e360cc displacement delivering high torque and smooth power\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2414\" data-end=\"2496\"\u003e\n\u003cp data-start=\"2416\" data-end=\"2496\"\u003eReady-to-run package including ignition, plugs, exhaust collector ring \u0026amp; mount\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2497\" data-end=\"2560\"\u003e\n\u003cp data-start=\"2499\" data-end=\"2560\"\u003ePrecision CNC-machined aluminium and bar stock construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2561\" data-end=\"2615\"\u003e\n\u003cp data-start=\"2563\" data-end=\"2615\"\u003eAircraft-grade alloy cylinder heads and crankcases\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2616\" data-end=\"2674\"\u003e\n\u003cp data-start=\"2618\" data-end=\"2674\"\u003eDouble-bearing crankshaft for smooth, stable operation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2675\" data-end=\"2736\"\u003e\n\u003cp data-start=\"2677\" data-end=\"2736\"\u003eBillet aluminium pistons with hardened steel piston rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2737\" data-end=\"2808\"\u003e\n\u003cp data-start=\"2739\" data-end=\"2808\"\u003eHard-chromed and lapped cylinder bores for durability and longevity\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2809\" data-end=\"2862\"\u003e\n\u003cp data-start=\"2811\" data-end=\"2862\"\u003eHardened steel camshaft for reliable valve timing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2863\" data-end=\"2922\"\u003e\n\u003cp data-start=\"2865\" data-end=\"2922\"\u003eIntegrated choke and throttle bellcranks for easy setup\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2923\" data-end=\"2979\"\u003e\n\u003cp data-start=\"2925\" data-end=\"2979\"\u003eCompatible with 87–110 octane petrol (32:1 fuel mix)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"2986\" data-end=\"3006\"\u003e\u003cstrong data-start=\"2989\" data-end=\"3004\"\u003ePerfect For\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"3007\" data-end=\"3305\"\u003e\n\u003cli data-start=\"3007\" data-end=\"3055\"\u003e\n\u003cp data-start=\"3009\" data-end=\"3055\"\u003eLarge-scale RC warbirds and vintage aircraft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3056\" data-end=\"3109\"\u003e\n\u003cp data-start=\"3058\" data-end=\"3109\"\u003eMuseum-quality and competition-level scale builds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3110\" data-end=\"3175\"\u003e\n\u003cp data-start=\"3112\" data-end=\"3175\"\u003eBuilders seeking authentic radial engine appearance and sound\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3176\" data-end=\"3246\"\u003e\n\u003cp data-start=\"3178\" data-end=\"3246\"\u003eHigh-torque applications requiring smooth, reliable 4-stroke power\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3247\" data-end=\"3305\"\u003e\n\u003cp data-start=\"3249\" data-end=\"3305\"\u003eAdvanced hobbyists and professional aircraft modellers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3312\" data-end=\"3335\"\u003e\u003cstrong data-start=\"3315\" data-end=\"3333\"\u003eSpecifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3337\" data-end=\"3824\"\u003e\u003cstrong data-start=\"3337\" data-end=\"3353\"\u003eEngine Type:\u003c\/strong\u003e 4-Stroke\u003cbr data-start=\"3362\" data-end=\"3365\"\u003e\u003cstrong data-start=\"3365\" data-end=\"3379\"\u003eCylinders:\u003c\/strong\u003e 7 (ABC Type)\u003cbr data-start=\"3392\" data-end=\"3395\"\u003e\u003cstrong data-start=\"3395\" data-end=\"3412\"\u003eDisplacement:\u003c\/strong\u003e 360cc\u003cbr data-start=\"3418\" data-end=\"3421\"\u003e\u003cstrong data-start=\"3421\" data-end=\"3430\"\u003eBore:\u003c\/strong\u003e 40.0mm\u003cbr data-start=\"3437\" data-end=\"3440\"\u003e\u003cstrong data-start=\"3440\" data-end=\"3451\"\u003eStroke:\u003c\/strong\u003e 42.0mm\u003cbr data-start=\"3458\" data-end=\"3461\"\u003e\u003cstrong data-start=\"3461\" data-end=\"3480\"\u003eApprox. Thrust:\u003c\/strong\u003e 38kgf @ 39×12 prop\u003cbr data-start=\"3499\" data-end=\"3502\"\u003e\u003cstrong data-start=\"3502\" data-end=\"3516\"\u003eRPM Range:\u003c\/strong\u003e 900 – 5,000\u003cbr data-start=\"3528\" data-end=\"3531\"\u003e\u003cstrong data-start=\"3531\" data-end=\"3569\"\u003eWeight (with silencer \u0026amp; ignition):\u003c\/strong\u003e Approx. 9.3kg\u003cbr data-start=\"3583\" data-end=\"3586\"\u003e\u003cstrong data-start=\"3586\" data-end=\"3606\"\u003eEngine Diameter:\u003c\/strong\u003e 340mm\u003cbr data-start=\"3612\" data-end=\"3615\"\u003e\u003cstrong data-start=\"3615\" data-end=\"3633\"\u003eEngine Length:\u003c\/strong\u003e 242mm\u003cbr data-start=\"3639\" data-end=\"3642\"\u003e\u003cstrong data-start=\"3642\" data-end=\"3668\"\u003eRecommended Propeller:\u003c\/strong\u003e 2-Blade 39×12\u003cbr data-start=\"3682\" data-end=\"3685\"\u003e\u003cstrong data-start=\"3685\" data-end=\"3702\"\u003eMuffler Type:\u003c\/strong\u003e Collector Ring\u003cbr data-start=\"3717\" data-end=\"3720\"\u003e\u003cstrong data-start=\"3720\" data-end=\"3735\"\u003eSpark Plug:\u003c\/strong\u003e CM-6 RCExl\u003cbr data-start=\"3746\" data-end=\"3749\"\u003e\u003cstrong data-start=\"3749\" data-end=\"3765\"\u003eCarburettor:\u003c\/strong\u003e Walbro\u003cbr data-start=\"3772\" data-end=\"3775\"\u003e\u003cstrong data-start=\"3775\" data-end=\"3789\"\u003eFuel Type:\u003c\/strong\u003e Petrol (87–110 octane, 32:1 mix)\u003c\/p\u003e\n\u003ch3 data-start=\"3491\" data-end=\"3529\"\u003e\u003cstrong data-start=\"3495\" data-end=\"3529\"\u003eWhy Buy from Probuild Aircraft\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"3530\" data-end=\"3723\"\u003e✅ Official UK stockist – 100% genuine UMS engines\u003cbr data-start=\"3579\" data-end=\"3582\"\u003e✅ Trusted by top international pilots and builders\u003cbr data-start=\"3632\" data-end=\"3635\"\u003e✅ Fast UK shipping and secure packaging\u003cbr data-start=\"3674\" data-end=\"3677\"\u003e✅ Supplying and supporting pilots since 1993\u003c\/p\u003e\n\u003cp data-start=\"3530\" data-end=\"3723\"\u003eManual:\u003c\/p\u003e\n\u003cp data-start=\"3530\" data-end=\"3723\"\u003e\u003ca href=\"https:\/\/ch-ignitions.com\/wp-content\/uploads\/2020\/03\/ums-gas-radial-engine-manual-9-115.pdf\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/Screenshot_2026-02-04_115553.png?v=1770206937\" alt=\"\" width=\"233\" height=\"351\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"UMS Engines","offers":[{"title":"Default Title","offer_id":56337239966082,"sku":"UMS7-360","price":3499.17,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/UMS-7-360CC-PETROL.jpg?v=1770741196"},{"product_id":"ums-5-cylinder-260cc-petrol-radial-engine-4-stroke-scale-aircraft-powerplant","title":"UMS 5-Cylinder 260cc Petrol Radial Engine – 4-Stroke Scale Aircraft Powerplant","description":"\u003cp data-start=\"372\" data-end=\"803\"\u003eThe \u003cstrong data-start=\"376\" data-end=\"421\"\u003eUMS 5-Cylinder 260cc Petrol Radial Engine\u003c\/strong\u003e is a premium 4-stroke powerplant designed for scale aircraft builders who demand \u003cstrong data-start=\"503\" data-end=\"580\"\u003eauthentic radial appearance, smooth operation, and dependable performance\u003c\/strong\u003e. With its classic 5-cylinder layout, precision CNC construction, and ready-to-run configuration, this engine delivers realistic sound, excellent torque, and long-term reliability for serious RC and scale aviation projects.\u003c\/p\u003e\n\u003ch2 data-start=\"810\" data-end=\"838\"\u003e\u003cstrong data-start=\"813\" data-end=\"836\"\u003eProduct Description\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"840\" data-end=\"1180\"\u003eThe \u003cstrong data-start=\"844\" data-end=\"882\"\u003eUMS 5-Cylinder 260cc Radial Engine\u003c\/strong\u003e blends traditional radial engine aesthetics with modern engineering to create a powerful and reliable propulsion solution for large-scale model aircraft. Its \u003cstrong data-start=\"1041\" data-end=\"1076\"\u003e5-cylinder radial configuration\u003c\/strong\u003e provides a striking, realistic appearance while ensuring smooth, balanced running across the RPM range.\u003c\/p\u003e\n\u003cp data-start=\"1182\" data-end=\"1557\"\u003eWith a \u003cstrong data-start=\"1189\" data-end=\"1211\"\u003e260cc displacement\u003c\/strong\u003e, this engine is ideally suited for scale warbirds, vintage aircraft, and precision-built projects that require both visual authenticity and strong performance. Supplied \u003cstrong data-start=\"1381\" data-end=\"1397\"\u003eready to run\u003c\/strong\u003e, it includes an exhaust collector ring, electronic ignition system, spark plugs, and a robust engine mount making installation straightforward and hassle-free.\u003c\/p\u003e\n\u003cp data-start=\"1559\" data-end=\"2015\"\u003eManufactured using \u003cstrong data-start=\"1578\" data-end=\"1628\"\u003eprecision CNC-machined aluminium and bar stock\u003c\/strong\u003e, the engine features \u003cstrong data-start=\"1650\" data-end=\"1704\"\u003eaircraft-grade alloy cylinder heads and crankcases\u003c\/strong\u003e, delivering exceptional strength without unnecessary weight. Internally, durability and smoothness are ensured by a \u003cstrong data-start=\"1821\" data-end=\"1861\"\u003eheavy-duty double-bearing crankshaft\u003c\/strong\u003e, billet aluminium pistons with hardened steel rings, and \u003cstrong data-start=\"1919\" data-end=\"1958\"\u003ehard-chromed, lapped cylinder bores\u003c\/strong\u003e for excellent wear resistance and compression retention.\u003c\/p\u003e\n\u003cp data-start=\"2017\" data-end=\"2341\"\u003eHardened steel camshafts provide accurate valve timing and long service life, while integrated choke and throttle bellcranks make setup and operation simple. Designed to run on \u003cstrong data-start=\"2194\" data-end=\"2218\"\u003e87–110 octane petrol\u003c\/strong\u003e with a \u003cstrong data-start=\"2226\" data-end=\"2254\"\u003e32:1 fuel-to-oil mixture\u003c\/strong\u003e, the UMS 5-260cc radial engine offers versatility, efficiency, and proven reliability.\u003c\/p\u003e\n\u003cp data-start=\"2343\" data-end=\"2486\"\u003eThis engine is an outstanding choice for builders seeking \u003cstrong data-start=\"2401\" data-end=\"2485\"\u003eauthentic radial sound, refined engineering, and dependable 4-stroke performance\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2 data-start=\"2493\" data-end=\"2514\"\u003e\u003cstrong data-start=\"2496\" data-end=\"2512\"\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2515\" data-end=\"3220\"\u003e\n\u003cli data-start=\"2515\" data-end=\"2584\"\u003e\n\u003cp data-start=\"2517\" data-end=\"2584\"\u003e5-cylinder 4-stroke radial engine with authentic scale appearance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2585\" data-end=\"2651\"\u003e\n\u003cp data-start=\"2587\" data-end=\"2651\"\u003e260cc displacement delivering smooth torque and reliable power\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2652\" data-end=\"2741\"\u003e\n\u003cp data-start=\"2654\" data-end=\"2741\"\u003eReady-to-run package including ignition, plugs, exhaust collector ring \u0026amp; engine mount\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2742\" data-end=\"2805\"\u003e\n\u003cp data-start=\"2744\" data-end=\"2805\"\u003ePrecision CNC-machined aluminium and bar stock construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2806\" data-end=\"2860\"\u003e\n\u003cp data-start=\"2808\" data-end=\"2860\"\u003eAircraft-grade alloy cylinder heads and crankcases\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2861\" data-end=\"2922\"\u003e\n\u003cp data-start=\"2863\" data-end=\"2922\"\u003eHeavy-duty double-bearing crankshaft for smooth operation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2923\" data-end=\"2984\"\u003e\n\u003cp data-start=\"2925\" data-end=\"2984\"\u003eBillet aluminium pistons with hardened steel piston rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2985\" data-end=\"3042\"\u003e\n\u003cp data-start=\"2987\" data-end=\"3042\"\u003eHard-chromed and lapped cylinder bores for durability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3043\" data-end=\"3096\"\u003e\n\u003cp data-start=\"3045\" data-end=\"3096\"\u003eHardened steel camshafts for precise valve timing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3097\" data-end=\"3163\"\u003e\n\u003cp data-start=\"3099\" data-end=\"3163\"\u003eIntegrated choke and throttle bellcranks for easy installation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3164\" data-end=\"3220\"\u003e\n\u003cp data-start=\"3166\" data-end=\"3220\"\u003eCompatible with 87–110 octane petrol (32:1 fuel mix)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3227\" data-end=\"3247\"\u003e\u003cstrong data-start=\"3230\" data-end=\"3245\"\u003ePerfect For\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"3248\" data-end=\"3518\"\u003e\n\u003cli data-start=\"3248\" data-end=\"3296\"\u003e\n\u003cp data-start=\"3250\" data-end=\"3296\"\u003eLarge-scale RC warbirds and vintage aircraft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3297\" data-end=\"3344\"\u003e\n\u003cp data-start=\"3299\" data-end=\"3344\"\u003eScale and competition-grade aircraft builds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3345\" data-end=\"3410\"\u003e\n\u003cp data-start=\"3347\" data-end=\"3410\"\u003eBuilders seeking realistic radial engine sound and appearance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3411\" data-end=\"3459\"\u003e\n\u003cp data-start=\"3413\" data-end=\"3459\"\u003eSmooth, reliable 4-stroke power applications\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3460\" data-end=\"3518\"\u003e\n\u003cp data-start=\"3462\" data-end=\"3518\"\u003eAdvanced hobbyists and professional aircraft modellers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3525\" data-end=\"3548\"\u003e\u003cstrong data-start=\"3528\" data-end=\"3546\"\u003eSpecifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3550\" data-end=\"3882\"\u003e\u003cstrong data-start=\"3550\" data-end=\"3566\"\u003eEngine Type:\u003c\/strong\u003e 4-Stroke\u003cbr data-start=\"3575\" data-end=\"3578\"\u003e\u003cstrong data-start=\"3578\" data-end=\"3592\"\u003eCylinders:\u003c\/strong\u003e 5 (ABC Type)\u003cbr data-start=\"3605\" data-end=\"3608\"\u003e\u003cstrong data-start=\"3608\" data-end=\"3625\"\u003eDisplacement:\u003c\/strong\u003e 260cc\u003cbr data-start=\"3631\" data-end=\"3634\"\u003e\u003cstrong data-start=\"3634\" data-end=\"3643\"\u003eBore:\u003c\/strong\u003e 40mm\u003cbr data-start=\"3648\" data-end=\"3651\"\u003e\u003cstrong data-start=\"3651\" data-end=\"3662\"\u003eStroke:\u003c\/strong\u003e 42mm\u003cbr data-start=\"3667\" data-end=\"3670\"\u003e\u003cstrong data-start=\"3670\" data-end=\"3689\"\u003eApprox. Thrust:\u003c\/strong\u003e 27kgf @ 33×14 prop\u003cbr data-start=\"3708\" data-end=\"3711\"\u003e\u003cstrong data-start=\"3711\" data-end=\"3725\"\u003eRPM Range:\u003c\/strong\u003e 1,000 – 5,500\u003cbr data-start=\"3739\" data-end=\"3742\"\u003e\u003cstrong data-start=\"3742\" data-end=\"3780\"\u003eWeight (with silencer \u0026amp; ignition):\u003c\/strong\u003e Approx. 6.0kg\u003cbr data-start=\"3794\" data-end=\"3797\"\u003e\u003cstrong data-start=\"3797\" data-end=\"3817\"\u003eEngine Diameter:\u003c\/strong\u003e 286mm\u003cbr data-start=\"3823\" data-end=\"3826\"\u003e\u003cstrong data-start=\"3826\" data-end=\"3844\"\u003eEngine Length:\u003c\/strong\u003e 208mm\u003cbr data-start=\"3850\" data-end=\"3853\"\u003e\u003cstrong data-start=\"3853\" data-end=\"3880\"\u003eRecommended Propellers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"3883\" data-end=\"4069\"\u003e\n\u003cli data-start=\"3883\" data-end=\"3900\"\u003e\n\u003cp data-start=\"3885\" data-end=\"3900\"\u003e2-Blade 32×12\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3901\" data-end=\"3918\"\u003e\n\u003cp data-start=\"3903\" data-end=\"3918\"\u003e2-Blade 32×14\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3919\" data-end=\"4069\"\u003e\n\u003cp data-start=\"3921\" data-end=\"4069\"\u003e2-Blade 33×14\u003cstrong data-start=\"3937\" data-end=\"3954\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3921\" data-end=\"4069\"\u003e\u003cstrong data-start=\"3937\" data-end=\"3954\"\u003eMuffler Type:\u003c\/strong\u003e Collector Ring\u003cbr data-start=\"3969\" data-end=\"3972\"\u003e\u003cstrong data-start=\"3972\" data-end=\"3987\"\u003eSpark Plug:\u003c\/strong\u003e CM6\u003cbr data-start=\"3991\" data-end=\"3994\"\u003e\u003cstrong data-start=\"3994\" data-end=\"4010\"\u003eCarburettor:\u003c\/strong\u003e Walbro\u003cbr data-start=\"4017\" data-end=\"4020\"\u003e\u003cstrong data-start=\"4020\" data-end=\"4034\"\u003eFuel Type:\u003c\/strong\u003e Petrol (87–110 octane, 32:1 mix)\u003c\/p\u003e\n\u003ch3 data-start=\"3491\" data-end=\"3529\"\u003e\u003cstrong data-start=\"3495\" data-end=\"3529\"\u003eWhy Buy from Probuild Aircraft\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"3530\" data-end=\"3723\"\u003e✅ Official UK stockist – 100% genuine UMS engines\u003cbr data-start=\"3579\" data-end=\"3582\"\u003e✅ Trusted by top international pilots and builders\u003cbr data-start=\"3632\" data-end=\"3635\"\u003e✅ Fast UK shipping and secure packaging\u003cbr data-start=\"3674\" data-end=\"3677\"\u003e✅ Supplying and supporting pilots since 1993\u003c\/p\u003e\n\u003cp data-start=\"3530\" data-end=\"3723\"\u003eManual:\u003c\/p\u003e\n\u003cp data-start=\"3530\" data-end=\"3723\"\u003e\u003ca href=\"https:\/\/ch-ignitions.com\/wp-content\/uploads\/2020\/03\/ums-gas-radial-engine-manual-9-115.pdf\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/Screenshot_2026-02-04_115553.png?v=1770206937\" alt=\"\" width=\"233\" height=\"351\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"UMS Engines","offers":[{"title":"Default Title","offer_id":56337273061762,"sku":"UMS7-360","price":2799.17,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/UMS-5-260-PETROL.jpg?v=1770737090"},{"product_id":"ums-5-cylinder-210cc-petrol-radial-engine-4-stroke-scale-aircraft-powerplant-copy","title":"UMS 5-Cylinder 210cc Petrol Radial Engine – 4-Stroke Scale Aircraft Powerplant","description":"\u003cp data-start=\"383\" data-end=\"769\"\u003eThe \u003cstrong data-start=\"387\" data-end=\"432\"\u003eUMS 5-Cylinder 210cc Petrol Radial Engine\u003c\/strong\u003e is a beautifully engineered 4-stroke powerplant designed for scale aircraft builders who demand \u003cstrong data-start=\"529\" data-end=\"595\"\u003eauthentic appearance, smooth operation, and proven reliability\u003c\/strong\u003e. With its classic 5-cylinder radial layout and precision CNC construction, it delivers realistic sound and dependable performance for serious scale and RC aviation projects.\u003c\/p\u003e\n\u003ch2 data-start=\"776\" data-end=\"804\"\u003e\u003cstrong data-start=\"779\" data-end=\"802\"\u003eProduct Description\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"806\" data-end=\"1081\"\u003eThe \u003cstrong data-start=\"810\" data-end=\"848\"\u003eUMS 5-Cylinder 210cc Radial Engine\u003c\/strong\u003e combines traditional radial engine aesthetics with modern manufacturing precision. Its authentic 5-cylinder configuration provides smooth, balanced running while closely replicating the look and sound of full-scale aviation engines.\u003c\/p\u003e\n\u003cp data-start=\"1083\" data-end=\"1403\"\u003eWith a \u003cstrong data-start=\"1090\" data-end=\"1112\"\u003e210cc displacement\u003c\/strong\u003e, this engine is ideally suited to medium and large-scale warbirds, vintage aircraft, and detailed scale builds. Supplied \u003cstrong data-start=\"1234\" data-end=\"1250\"\u003eready to run\u003c\/strong\u003e, it includes an exhaust collector ring, electronic ignition, spark plugs, and a sturdy engine mount—allowing for quick and straightforward installation.\u003c\/p\u003e\n\u003cp data-start=\"1405\" data-end=\"1780\"\u003eThe engine is built using \u003cstrong data-start=\"1431\" data-end=\"1481\"\u003eprecision CNC-machined aluminium and bar stock\u003c\/strong\u003e, ensuring consistent tolerances and long-term reliability. \u003cstrong data-start=\"1541\" data-end=\"1595\"\u003eAircraft-grade alloy cylinder heads and crankcases\u003c\/strong\u003e provide excellent strength while keeping weight under control. Internally, a \u003cstrong data-start=\"1673\" data-end=\"1713\"\u003eheavy-duty double-bearing crankshaft\u003c\/strong\u003e ensures smooth operation and durability even under sustained load.\u003c\/p\u003e\n\u003cp data-start=\"1782\" data-end=\"2055\"\u003eBillet aluminium pistons fitted with hardened steel rings improve efficiency and compression, while \u003cstrong data-start=\"1882\" data-end=\"1924\"\u003ehard-chromed and lapped cylinder bores\u003c\/strong\u003e enhance wear resistance and longevity. Hardened steel camshafts ensure accurate valve timing and dependable long-term performance.\u003c\/p\u003e\n\u003cp data-start=\"2057\" data-end=\"2365\"\u003eDesigned to run on \u003cstrong data-start=\"2076\" data-end=\"2100\"\u003e87–110 octane petrol\u003c\/strong\u003e with a \u003cstrong data-start=\"2108\" data-end=\"2136\"\u003e32:1 fuel-to-oil mixture\u003c\/strong\u003e, the UMS 5-210cc radial engine is practical, versatile, and engineered for real-world flying conditions. It is an excellent choice for builders seeking \u003cstrong data-start=\"2289\" data-end=\"2364\"\u003escale realism, refined engineering, and dependable 4-stroke performance\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2 data-start=\"2372\" data-end=\"2393\"\u003e\u003cstrong data-start=\"2375\" data-end=\"2391\"\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2394\" data-end=\"3098\"\u003e\n\u003cli data-start=\"2394\" data-end=\"2463\"\u003e\n\u003cp data-start=\"2396\" data-end=\"2463\"\u003e5-cylinder 4-stroke radial engine with authentic scale appearance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2464\" data-end=\"2520\"\u003e\n\u003cp data-start=\"2466\" data-end=\"2520\"\u003e210cc displacement delivering smooth, reliable power\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2521\" data-end=\"2610\"\u003e\n\u003cp data-start=\"2523\" data-end=\"2610\"\u003eReady-to-run package including ignition, plugs, exhaust collector ring \u0026amp; engine mount\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2611\" data-end=\"2674\"\u003e\n\u003cp data-start=\"2613\" data-end=\"2674\"\u003ePrecision CNC-machined aluminium and bar stock construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2675\" data-end=\"2729\"\u003e\n\u003cp data-start=\"2677\" data-end=\"2729\"\u003eAircraft-grade alloy cylinder heads and crankcases\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2730\" data-end=\"2799\"\u003e\n\u003cp data-start=\"2732\" data-end=\"2799\"\u003eHeavy-duty double-bearing crankshaft for smooth, stable operation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2800\" data-end=\"2861\"\u003e\n\u003cp data-start=\"2802\" data-end=\"2861\"\u003eBillet aluminium pistons with hardened steel piston rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2862\" data-end=\"2919\"\u003e\n\u003cp data-start=\"2864\" data-end=\"2919\"\u003eHard-chromed and lapped cylinder bores for durability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2920\" data-end=\"2973\"\u003e\n\u003cp data-start=\"2922\" data-end=\"2973\"\u003eHardened steel camshafts for precise valve timing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2974\" data-end=\"3041\"\u003e\n\u003cp data-start=\"2976\" data-end=\"3041\"\u003eIntegrated choke and throttle bell cranks for easy installation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3042\" data-end=\"3098\"\u003e\n\u003cp data-start=\"3044\" data-end=\"3098\"\u003eCompatible with 87–110 octane petrol (32:1 fuel mix)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3105\" data-end=\"3125\"\u003e\u003cstrong data-start=\"3108\" data-end=\"3123\"\u003ePerfect For\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"3126\" data-end=\"3381\"\u003e\n\u003cli data-start=\"3126\" data-end=\"3168\"\u003e\n\u003cp data-start=\"3128\" data-end=\"3168\"\u003eScale RC warbirds and vintage aircraft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3169\" data-end=\"3212\"\u003e\n\u003cp data-start=\"3171\" data-end=\"3212\"\u003eMedium to large-scale aircraft projects\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3213\" data-end=\"3271\"\u003e\n\u003cp data-start=\"3215\" data-end=\"3271\"\u003eBuilders seeking realistic radial sound and appearance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3272\" data-end=\"3322\"\u003e\n\u003cp data-start=\"3274\" data-end=\"3322\"\u003eSmooth, dependable 4-stroke power applications\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3323\" data-end=\"3381\"\u003e\n\u003cp data-start=\"3325\" data-end=\"3381\"\u003eAdvanced hobbyists and professional aircraft modellers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3388\" data-end=\"3411\"\u003e\u003cstrong data-start=\"3391\" data-end=\"3409\"\u003eSpecifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3413\" data-end=\"3749\"\u003e\u003cstrong data-start=\"3413\" data-end=\"3429\"\u003eEngine Type:\u003c\/strong\u003e 4-Stroke\u003cbr data-start=\"3438\" data-end=\"3441\"\u003e\u003cstrong data-start=\"3441\" data-end=\"3455\"\u003eCylinders:\u003c\/strong\u003e 5 (ABC Type)\u003cbr data-start=\"3468\" data-end=\"3471\"\u003e\u003cstrong data-start=\"3471\" data-end=\"3488\"\u003eDisplacement:\u003c\/strong\u003e 210cc\u003cbr data-start=\"3494\" data-end=\"3497\"\u003e\u003cstrong data-start=\"3497\" data-end=\"3506\"\u003eBore:\u003c\/strong\u003e 37mm\u003cbr data-start=\"3511\" data-end=\"3514\"\u003e\u003cstrong data-start=\"3514\" data-end=\"3525\"\u003eStroke:\u003c\/strong\u003e 39.2mm\u003cbr data-start=\"3532\" data-end=\"3535\"\u003e\u003cstrong data-start=\"3535\" data-end=\"3554\"\u003eApprox. Thrust:\u003c\/strong\u003e 23.5kgf @ 30×12 prop\u003cbr data-start=\"3575\" data-end=\"3578\"\u003e\u003cstrong data-start=\"3578\" data-end=\"3592\"\u003eRPM Range:\u003c\/strong\u003e 1,000 – 5,500\u003cbr data-start=\"3606\" data-end=\"3609\"\u003e\u003cstrong data-start=\"3609\" data-end=\"3647\"\u003eWeight (with silencer \u0026amp; ignition):\u003c\/strong\u003e Approx. 5.8kg\u003cbr data-start=\"3661\" data-end=\"3664\"\u003e\u003cstrong data-start=\"3664\" data-end=\"3684\"\u003eEngine Diameter:\u003c\/strong\u003e 285mm\u003cbr data-start=\"3690\" data-end=\"3693\"\u003e\u003cstrong data-start=\"3693\" data-end=\"3711\"\u003eEngine Length:\u003c\/strong\u003e 205mm\u003cbr data-start=\"3717\" data-end=\"3720\"\u003e\u003cstrong data-start=\"3720\" data-end=\"3747\"\u003eRecommended Propellers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"3750\" data-end=\"3767\"\u003e\n\u003cp data-start=\"3752\" data-end=\"3767\"\u003e2-Blade 30×10\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3768\" data-end=\"3785\"\u003e\n\u003cp data-start=\"3770\" data-end=\"3785\"\u003e2-Blade 30×12\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3788\" data-end=\"3936\"\u003e2-Blade 32×10\u003cbr data-start=\"3801\" data-end=\"3804\"\u003e\u003cstrong data-start=\"3804\" data-end=\"3821\"\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong data-start=\"3804\" data-end=\"3821\"\u003eMuffler Type:\u003c\/strong\u003e Collector Ring\u003cbr data-start=\"3836\" data-end=\"3839\"\u003e\u003cstrong data-start=\"3839\" data-end=\"3854\"\u003eSpark Plug:\u003c\/strong\u003e CM6\u003cbr data-start=\"3858\" data-end=\"3861\"\u003e\u003cstrong data-start=\"3861\" data-end=\"3877\"\u003eCarburettor:\u003c\/strong\u003e Walbro\u003cbr data-start=\"3884\" data-end=\"3887\"\u003e\u003cstrong data-start=\"3887\" data-end=\"3901\"\u003eFuel Type:\u003c\/strong\u003e Petrol (87–110 octane, 32:1 mix)\u003c\/p\u003e\n\u003ch3 data-start=\"3491\" data-end=\"3529\"\u003e\u003cstrong data-start=\"3495\" data-end=\"3529\"\u003eWhy Buy from Probuild Aircraft\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"3530\" data-end=\"3723\"\u003e✅ Official UK stockist – 100% genuine UMS engines\u003cbr data-start=\"3579\" data-end=\"3582\"\u003e✅ Trusted by top international pilots and builders\u003cbr data-start=\"3632\" data-end=\"3635\"\u003e✅ Fast UK shipping and secure packaging\u003cbr data-start=\"3674\" data-end=\"3677\"\u003e✅ Supplying and supporting pilots since 1993\u003c\/p\u003e\n\u003cp data-start=\"3530\" data-end=\"3723\"\u003eManual:\u003c\/p\u003e\n\u003cp data-start=\"3530\" data-end=\"3723\"\u003e\u003ca href=\"https:\/\/ch-ignitions.com\/wp-content\/uploads\/2020\/03\/ums-gas-radial-engine-manual-9-115.pdf\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/Screenshot_2026-02-04_115553.png?v=1770206937\" alt=\"\" width=\"233\" height=\"351\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"UMS Engines","offers":[{"title":"Default Title","offer_id":56337310417282,"sku":"UMS5-210","price":2312.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/UMS-5-210CC-PETROL.jpg?v=1770738003"},{"product_id":"ums-5-cylinder-180cc-petrol-radial-engine-4-stroke-scale-aircraft-powerplant","title":"UMS 5-Cylinder 180cc Petrol Radial Engine – 4-Stroke Scale Aircraft Powerplant","description":"\u003cp data-start=\"383\" data-end=\"757\"\u003eThe \u003cstrong data-start=\"387\" data-end=\"432\"\u003eUMS 5-Cylinder 180cc Petrol Radial Engine\u003c\/strong\u003e is a compact yet powerful 4-stroke radial engine designed for scale aircraft builders who want \u003cstrong data-start=\"528\" data-end=\"599\"\u003eauthentic appearance, smooth performance, and long-term reliability\u003c\/strong\u003e. Precision CNC-machined and supplied ready to run, this engine delivers classic radial sound and dependable power for serious scale and RC aircraft projects.\u003c\/p\u003e\n\u003ch2 data-start=\"764\" data-end=\"792\"\u003e\u003cstrong data-start=\"767\" data-end=\"790\"\u003eProduct Description\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"794\" data-end=\"1095\"\u003eThe \u003cstrong data-start=\"798\" data-end=\"836\"\u003eUMS 5-Cylinder 180cc Radial Engine\u003c\/strong\u003e offers an ideal balance of \u003cstrong data-start=\"864\" data-end=\"929\"\u003erealistic scale appearance and modern engineering performance\u003c\/strong\u003e. Its classic 5-cylinder radial configuration provides smooth, well-balanced operation while accurately replicating the look and sound of full-scale aircraft engines.\u003c\/p\u003e\n\u003cp data-start=\"1097\" data-end=\"1424\"\u003eWith a \u003cstrong data-start=\"1104\" data-end=\"1126\"\u003e180cc displacement\u003c\/strong\u003e, this engine is perfectly suited for medium-scale warbirds, vintage aircraft, and detailed scale models. Supplied \u003cstrong data-start=\"1241\" data-end=\"1257\"\u003eready to run\u003c\/strong\u003e, it includes an exhaust collector ring, electronic ignition system, spark plugs, and a robust engine mount, allowing for straightforward installation and quick setup.\u003c\/p\u003e\n\u003cp data-start=\"1426\" data-end=\"1815\"\u003eBuilt using \u003cstrong data-start=\"1438\" data-end=\"1488\"\u003eprecision CNC-machined aluminium and bar stock\u003c\/strong\u003e, the engine maintains tight manufacturing tolerances for consistent performance. \u003cstrong data-start=\"1570\" data-end=\"1634\"\u003eAircraft-grade aluminium alloy cylinder heads and crankcases\u003c\/strong\u003e ensure strength and durability while keeping weight to a minimum. A \u003cstrong data-start=\"1703\" data-end=\"1743\"\u003eheavy-duty double-bearing crankshaft\u003c\/strong\u003e provides smooth operation and enhances longevity under sustained loads.\u003c\/p\u003e\n\u003cp data-start=\"1817\" data-end=\"2104\"\u003eInternally, billet aluminium pistons with hardened steel rings reduce friction and improve combustion efficiency, while \u003cstrong data-start=\"1937\" data-end=\"1979\"\u003ehard-chromed and lapped cylinder bores\u003c\/strong\u003e deliver excellent wear resistance. Hardened steel camshafts ensure accurate valve timing and reliable long-term performance.\u003c\/p\u003e\n\u003cp data-start=\"2106\" data-end=\"2422\"\u003eDesigned to operate on \u003cstrong data-start=\"2129\" data-end=\"2153\"\u003e87–110 octane petrol\u003c\/strong\u003e with a \u003cstrong data-start=\"2161\" data-end=\"2189\"\u003e32:1 fuel-to-oil mixture\u003c\/strong\u003e, the UMS 5-180cc radial engine is versatile, practical, and engineered for real-world flying conditions. It is an excellent choice for builders seeking \u003cstrong data-start=\"2342\" data-end=\"2421\"\u003eauthentic radial sound, refined construction, and dependable 4-stroke power\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2 data-start=\"2429\" data-end=\"2450\"\u003e\u003cstrong data-start=\"2432\" data-end=\"2448\"\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2451\" data-end=\"3168\"\u003e\n\u003cli data-start=\"2451\" data-end=\"2520\"\u003e\n\u003cp data-start=\"2453\" data-end=\"2520\"\u003e5-cylinder 4-stroke radial engine with authentic scale appearance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2521\" data-end=\"2577\"\u003e\n\u003cp data-start=\"2523\" data-end=\"2577\"\u003e180cc displacement delivering smooth, reliable power\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2578\" data-end=\"2667\"\u003e\n\u003cp data-start=\"2580\" data-end=\"2667\"\u003eReady-to-run package including ignition, plugs, exhaust collector ring \u0026amp; engine mount\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2668\" data-end=\"2731\"\u003e\n\u003cp data-start=\"2670\" data-end=\"2731\"\u003ePrecision CNC-machined aluminium and bar stock construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2732\" data-end=\"2786\"\u003e\n\u003cp data-start=\"2734\" data-end=\"2786\"\u003eAircraft-grade alloy cylinder heads and crankcases\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2787\" data-end=\"2856\"\u003e\n\u003cp data-start=\"2789\" data-end=\"2856\"\u003eHeavy-duty double-bearing crankshaft for smooth, stable operation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2857\" data-end=\"2918\"\u003e\n\u003cp data-start=\"2859\" data-end=\"2918\"\u003eBillet aluminium pistons with hardened steel piston rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2919\" data-end=\"2990\"\u003e\n\u003cp data-start=\"2921\" data-end=\"2990\"\u003eHard-chromed and lapped cylinder bores for durability and longevity\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2991\" data-end=\"3044\"\u003e\n\u003cp data-start=\"2993\" data-end=\"3044\"\u003eHardened steel camshafts for precise valve timing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3045\" data-end=\"3111\"\u003e\n\u003cp data-start=\"3047\" data-end=\"3111\"\u003eIntegrated choke and throttle bellcranks for easy installation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3112\" data-end=\"3168\"\u003e\n\u003cp data-start=\"3114\" data-end=\"3168\"\u003eCompatible with 87–110 octane petrol (32:1 fuel mix)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3175\" data-end=\"3195\"\u003e\u003cstrong data-start=\"3178\" data-end=\"3193\"\u003ePerfect For\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"3196\" data-end=\"3436\"\u003e\n\u003cli data-start=\"3196\" data-end=\"3238\"\u003e\n\u003cp data-start=\"3198\" data-end=\"3238\"\u003eScale RC warbirds and vintage aircraft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3239\" data-end=\"3273\"\u003e\n\u003cp data-start=\"3241\" data-end=\"3273\"\u003eMedium-scale aircraft projects\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3274\" data-end=\"3332\"\u003e\n\u003cp data-start=\"3276\" data-end=\"3332\"\u003eBuilders seeking realistic radial sound and appearance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3333\" data-end=\"3377\"\u003e\n\u003cp data-start=\"3335\" data-end=\"3377\"\u003eSmooth, dependable 4-stroke petrol power\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3378\" data-end=\"3436\"\u003e\n\u003cp data-start=\"3380\" data-end=\"3436\"\u003eAdvanced hobbyists and professional aircraft modellers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3443\" data-end=\"3466\"\u003e\u003cstrong data-start=\"3446\" data-end=\"3464\"\u003eSpecifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3468\" data-end=\"3802\"\u003e\u003cstrong data-start=\"3468\" data-end=\"3484\"\u003eEngine Type:\u003c\/strong\u003e 4-Stroke\u003cbr data-start=\"3493\" data-end=\"3496\"\u003e\u003cstrong data-start=\"3496\" data-end=\"3510\"\u003eCylinders:\u003c\/strong\u003e 5 (ABC Type)\u003cbr data-start=\"3523\" data-end=\"3526\"\u003e\u003cstrong data-start=\"3526\" data-end=\"3543\"\u003eDisplacement:\u003c\/strong\u003e 180cc\u003cbr data-start=\"3549\" data-end=\"3552\"\u003e\u003cstrong data-start=\"3552\" data-end=\"3561\"\u003eBore:\u003c\/strong\u003e 35.7mm\u003cbr data-start=\"3568\" data-end=\"3571\"\u003e\u003cstrong data-start=\"3571\" data-end=\"3582\"\u003eStroke:\u003c\/strong\u003e 37mm\u003cbr data-start=\"3587\" data-end=\"3590\"\u003e\u003cstrong data-start=\"3590\" data-end=\"3609\"\u003eApprox. Thrust:\u003c\/strong\u003e 21kgf @ 30×10 prop\u003cbr data-start=\"3628\" data-end=\"3631\"\u003e\u003cstrong data-start=\"3631\" data-end=\"3645\"\u003eRPM Range:\u003c\/strong\u003e 1,000 – 5,500\u003cbr data-start=\"3659\" data-end=\"3662\"\u003e\u003cstrong data-start=\"3662\" data-end=\"3700\"\u003eWeight (with silencer \u0026amp; ignition):\u003c\/strong\u003e Approx. 5.5kg\u003cbr data-start=\"3714\" data-end=\"3717\"\u003e\u003cstrong data-start=\"3717\" data-end=\"3737\"\u003eEngine Diameter:\u003c\/strong\u003e 277mm\u003cbr data-start=\"3743\" data-end=\"3746\"\u003e\u003cstrong data-start=\"3746\" data-end=\"3764\"\u003eEngine Length:\u003c\/strong\u003e 198mm\u003cbr data-start=\"3770\" data-end=\"3773\"\u003e\u003cstrong data-start=\"3773\" data-end=\"3800\"\u003eRecommended Propellers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"3803\" data-end=\"3989\"\u003e\n\u003cli data-start=\"3803\" data-end=\"3820\"\u003e\n\u003cp data-start=\"3805\" data-end=\"3820\"\u003e2-Blade 28×10\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3821\" data-end=\"3838\"\u003e\n\u003cp data-start=\"3823\" data-end=\"3838\"\u003e2-Blade 28×12\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3839\" data-end=\"3989\"\u003e\n\u003cp data-start=\"3841\" data-end=\"3989\"\u003e2-Blade 30×10\u003cbr data-start=\"3854\" data-end=\"3857\"\u003e\u003cstrong data-start=\"3857\" data-end=\"3874\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3841\" data-end=\"3989\"\u003e\u003cstrong data-start=\"3857\" data-end=\"3874\"\u003eMuffler Type:\u003c\/strong\u003e Collector Ring\u003cbr data-start=\"3889\" data-end=\"3892\"\u003e\u003cstrong data-start=\"3892\" data-end=\"3907\"\u003eSpark Plug:\u003c\/strong\u003e CM6\u003cbr data-start=\"3911\" data-end=\"3914\"\u003e\u003cstrong data-start=\"3914\" data-end=\"3930\"\u003eCarburettor:\u003c\/strong\u003e Walbro\u003cbr data-start=\"3937\" data-end=\"3940\"\u003e\u003cstrong data-start=\"3940\" data-end=\"3954\"\u003eFuel Type:\u003c\/strong\u003e Petrol (87–110 octane, 32:1 mix)\u003c\/p\u003e\n\u003ch3 data-end=\"3529\" data-start=\"3491\"\u003e\u003cstrong data-end=\"3529\" data-start=\"3495\"\u003eWhy Buy from Probuild Aircraft\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e✅ Official UK stockist – 100% genuine UMS engines\u003cbr data-end=\"3582\" data-start=\"3579\"\u003e✅ Trusted by top international pilots and builders\u003cbr data-end=\"3635\" data-start=\"3632\"\u003e✅ Fast UK shipping and secure packaging\u003cbr data-end=\"3677\" data-start=\"3674\"\u003e✅ Supplying and supporting pilots since 1993\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003eManual:\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e\u003ca rel=\"noopener\" href=\"https:\/\/ch-ignitions.com\/wp-content\/uploads\/2020\/03\/ums-gas-radial-engine-manual-9-115.pdf\" target=\"_blank\"\u003e\u003cimg height=\"351\" width=\"233\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/Screenshot_2026-02-04_115553.png?v=1770206937\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"UMS Engines","offers":[{"title":"Default Title","offer_id":56337374183810,"sku":"UMS5-180","price":2132.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/UMS-5-180CC-PERTOL.jpg?v=1770738689"},{"product_id":"ums-5-cylinder-150cc-petrol-radial-engine-4-stroke-scale-aircraft-powerplant","title":"UMS 5-Cylinder 150cc Petrol Radial Engine – 4-Stroke Scale Aircraft Powerplant","description":"\u003cp data-start=\"387\" data-end=\"787\"\u003eThe \u003cstrong data-start=\"391\" data-end=\"436\"\u003eUMS 5-Cylinder 150cc Petrol Radial Engine\u003c\/strong\u003e is a compact, precision-engineered 4-stroke powerplant designed for scale aircraft builders who want \u003cstrong data-start=\"538\" data-end=\"620\"\u003eauthentic radial appearance, smooth power delivery, and dependable reliability\u003c\/strong\u003e. Supplied ready to run and CNC-machined from aircraft-grade materials, this engine delivers classic radial sound and performance in a lighter, more versatile package.\u003c\/p\u003e\n\u003ch2 data-start=\"794\" data-end=\"822\"\u003e\u003cstrong data-start=\"797\" data-end=\"820\"\u003eProduct Description\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"824\" data-end=\"1123\"\u003eThe \u003cstrong data-start=\"828\" data-end=\"866\"\u003eUMS 5-Cylinder 150cc Radial Engine\u003c\/strong\u003e is engineered to strike the perfect balance between \u003cstrong data-start=\"919\" data-end=\"966\"\u003escale realism, performance, and ease of use\u003c\/strong\u003e. Its classic 5-cylinder radial configuration provides smooth, balanced operation while closely replicating the look and sound of full-size aviation engines.\u003c\/p\u003e\n\u003cp data-start=\"1125\" data-end=\"1498\"\u003eWith a \u003cstrong data-start=\"1132\" data-end=\"1154\"\u003e150cc displacement\u003c\/strong\u003e, this engine is ideal for medium-scale warbirds, vintage aircraft, and detailed scale projects where weight, realism, and reliability are equally important. Delivered \u003cstrong data-start=\"1322\" data-end=\"1338\"\u003eready to run\u003c\/strong\u003e, it includes an exhaust collector ring, electronic ignition, spark plugs, and a robust engine mount, allowing for quick installation and straightforward setup.\u003c\/p\u003e\n\u003cp data-start=\"1500\" data-end=\"1874\"\u003eAll major components are \u003cstrong data-start=\"1525\" data-end=\"1595\"\u003eprecision CNC-machined from aircraft-grade aluminium and bar stock\u003c\/strong\u003e, ensuring tight tolerances and consistent performance. The cylinder heads and crankcases use high-strength aluminium alloys to provide durability without unnecessary weight. A \u003cstrong data-start=\"1772\" data-end=\"1812\"\u003eheavy-duty double-bearing crankshaft\u003c\/strong\u003e enhances smoothness and longevity during sustained operation.\u003c\/p\u003e\n\u003cp data-start=\"1876\" data-end=\"2144\"\u003eInternally, \u003cstrong data-start=\"1888\" data-end=\"1942\"\u003ebillet aluminium pistons with hardened steel rings\u003c\/strong\u003e improve efficiency and compression, while \u003cstrong data-start=\"1985\" data-end=\"2027\"\u003ehard-chromed and lapped cylinder bores\u003c\/strong\u003e reduce wear and extend service life. Hardened steel camshafts ensure precise valve timing and long-term reliability.\u003c\/p\u003e\n\u003cp data-start=\"2146\" data-end=\"2466\"\u003eDesigned to run on \u003cstrong data-start=\"2165\" data-end=\"2189\"\u003e87–110 octane petrol\u003c\/strong\u003e with a \u003cstrong data-start=\"2197\" data-end=\"2225\"\u003e32:1 fuel-to-oil mixture\u003c\/strong\u003e, the UMS 5-150cc radial engine is practical, economical, and engineered for real-world flying conditions. It is an excellent choice for builders seeking \u003cstrong data-start=\"2379\" data-end=\"2465\"\u003eauthentic scale presence, refined engineering, and dependable 4-stroke performance\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2 data-start=\"2473\" data-end=\"2494\"\u003e\u003cstrong data-start=\"2476\" data-end=\"2492\"\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2495\" data-end=\"3218\"\u003e\n\u003cli data-start=\"2495\" data-end=\"2564\"\u003e\n\u003cp data-start=\"2497\" data-end=\"2564\"\u003e5-cylinder 4-stroke radial engine with authentic scale appearance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2565\" data-end=\"2623\"\u003e\n\u003cp data-start=\"2567\" data-end=\"2623\"\u003e150cc displacement delivering smooth, dependable power\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2624\" data-end=\"2713\"\u003e\n\u003cp data-start=\"2626\" data-end=\"2713\"\u003eReady-to-run package including ignition, plugs, exhaust collector ring \u0026amp; engine mount\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2714\" data-end=\"2792\"\u003e\n\u003cp data-start=\"2716\" data-end=\"2792\"\u003ePrecision CNC-machined aircraft-grade aluminium and bar stock construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2793\" data-end=\"2847\"\u003e\n\u003cp data-start=\"2795\" data-end=\"2847\"\u003eAircraft-grade alloy cylinder heads and crankcases\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2848\" data-end=\"2917\"\u003e\n\u003cp data-start=\"2850\" data-end=\"2917\"\u003eHeavy-duty double-bearing crankshaft for smooth, stable operation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2918\" data-end=\"2979\"\u003e\n\u003cp data-start=\"2920\" data-end=\"2979\"\u003eBillet aluminium pistons with hardened steel piston rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2980\" data-end=\"3039\"\u003e\n\u003cp data-start=\"2982\" data-end=\"3039\"\u003eHard-chromed and lapped cylinder bores for reduced wear\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3040\" data-end=\"3094\"\u003e\n\u003cp data-start=\"3042\" data-end=\"3094\"\u003eHardened steel camshafts for accurate valve timing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3095\" data-end=\"3161\"\u003e\n\u003cp data-start=\"3097\" data-end=\"3161\"\u003eIntegrated choke and throttle bellcranks for easy installation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3162\" data-end=\"3218\"\u003e\n\u003cp data-start=\"3164\" data-end=\"3218\"\u003eCompatible with 87–110 octane petrol (32:1 fuel mix)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3225\" data-end=\"3245\"\u003e\u003cstrong data-start=\"3228\" data-end=\"3243\"\u003ePerfect For\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"3246\" data-end=\"3494\"\u003e\n\u003cli data-start=\"3246\" data-end=\"3288\"\u003e\n\u003cp data-start=\"3248\" data-end=\"3288\"\u003eScale RC warbirds and vintage aircraft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3289\" data-end=\"3333\"\u003e\n\u003cp data-start=\"3291\" data-end=\"3333\"\u003eMedium-scale aircraft and replica builds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3334\" data-end=\"3392\"\u003e\n\u003cp data-start=\"3336\" data-end=\"3392\"\u003eBuilders seeking realistic radial sound and appearance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3393\" data-end=\"3435\"\u003e\n\u003cp data-start=\"3395\" data-end=\"3435\"\u003eSmooth, reliable 4-stroke petrol power\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3436\" data-end=\"3494\"\u003e\n\u003cp data-start=\"3438\" data-end=\"3494\"\u003eAdvanced hobbyists and professional aircraft modellers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3501\" data-end=\"3524\"\u003e\u003cstrong data-start=\"3504\" data-end=\"3522\"\u003eSpecifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3526\" data-end=\"3862\"\u003e\u003cstrong data-start=\"3526\" data-end=\"3542\"\u003eEngine Type:\u003c\/strong\u003e 4-Stroke\u003cbr data-start=\"3551\" data-end=\"3554\"\u003e\u003cstrong data-start=\"3554\" data-end=\"3568\"\u003eCylinders:\u003c\/strong\u003e 5 (ABC Type)\u003cbr data-start=\"3581\" data-end=\"3584\"\u003e\u003cstrong data-start=\"3584\" data-end=\"3601\"\u003eDisplacement:\u003c\/strong\u003e 150cc\u003cbr data-start=\"3607\" data-end=\"3610\"\u003e\u003cstrong data-start=\"3610\" data-end=\"3619\"\u003eBore:\u003c\/strong\u003e 35.7mm\u003cbr data-start=\"3626\" data-end=\"3629\"\u003e\u003cstrong data-start=\"3629\" data-end=\"3640\"\u003eStroke:\u003c\/strong\u003e 31mm\u003cbr data-start=\"3645\" data-end=\"3648\"\u003e\u003cstrong data-start=\"3648\" data-end=\"3667\"\u003eApprox. Thrust:\u003c\/strong\u003e 18.5kgf @ 30×10 prop\u003cbr data-start=\"3688\" data-end=\"3691\"\u003e\u003cstrong data-start=\"3691\" data-end=\"3705\"\u003eRPM Range:\u003c\/strong\u003e 1,000 – 5,500\u003cbr data-start=\"3719\" data-end=\"3722\"\u003e\u003cstrong data-start=\"3722\" data-end=\"3760\"\u003eWeight (with silencer \u0026amp; ignition):\u003c\/strong\u003e Approx. 5.1kg\u003cbr data-start=\"3774\" data-end=\"3777\"\u003e\u003cstrong data-start=\"3777\" data-end=\"3797\"\u003eEngine Diameter:\u003c\/strong\u003e 260mm\u003cbr data-start=\"3803\" data-end=\"3806\"\u003e\u003cstrong data-start=\"3806\" data-end=\"3824\"\u003eEngine Length:\u003c\/strong\u003e 177mm\u003cbr data-start=\"3830\" data-end=\"3833\"\u003e\u003cstrong data-start=\"3833\" data-end=\"3860\"\u003eRecommended Propellers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"3863\" data-end=\"4049\"\u003e\n\u003cli data-start=\"3863\" data-end=\"3880\"\u003e\n\u003cp data-start=\"3865\" data-end=\"3880\"\u003e2-Blade 28×10\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3881\" data-end=\"3898\"\u003e\n\u003cp data-start=\"3883\" data-end=\"3898\"\u003e2-Blade 30×10\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3899\" data-end=\"4049\"\u003e\n\u003cp data-start=\"3901\" data-end=\"4049\"\u003e2-Blade 30×12\u003cbr data-start=\"3914\" data-end=\"3917\"\u003e\u003cstrong data-start=\"3917\" data-end=\"3934\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3901\" data-end=\"4049\"\u003e\u003cstrong data-start=\"3917\" data-end=\"3934\"\u003eMuffler Type:\u003c\/strong\u003e Collector Ring\u003cbr data-start=\"3949\" data-end=\"3952\"\u003e\u003cstrong data-start=\"3952\" data-end=\"3967\"\u003eSpark Plug:\u003c\/strong\u003e CM6\u003cbr data-start=\"3971\" data-end=\"3974\"\u003e\u003cstrong data-start=\"3974\" data-end=\"3990\"\u003eCarburettor:\u003c\/strong\u003e Walbro\u003cbr data-start=\"3997\" data-end=\"4000\"\u003e\u003cstrong data-start=\"4000\" data-end=\"4014\"\u003eFuel Type:\u003c\/strong\u003e Petrol (87–110 octane, 32:1 mix)\u003c\/p\u003e\n\u003ch3 data-end=\"3529\" data-start=\"3491\"\u003e\u003cstrong data-end=\"3529\" data-start=\"3495\"\u003eWhy Buy from Probuild Aircraft\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e✅ Official UK stockist – 100% genuine UMS engines\u003cbr data-end=\"3582\" data-start=\"3579\"\u003e✅ Trusted by top international pilots and builders\u003cbr data-end=\"3635\" data-start=\"3632\"\u003e✅ Fast UK shipping and secure packaging\u003cbr data-end=\"3677\" data-start=\"3674\"\u003e✅ Supplying and supporting pilots since 1993\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003eManual:\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e\u003ca rel=\"noopener\" href=\"https:\/\/ch-ignitions.com\/wp-content\/uploads\/2020\/03\/ums-gas-radial-engine-manual-9-115.pdf\" target=\"_blank\"\u003e\u003cimg height=\"351\" width=\"233\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/Screenshot_2026-02-04_115553.png?v=1770206937\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"UMS Engines","offers":[{"title":"Default Title","offer_id":56337425793410,"sku":"UMS5-150","price":2082.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/UMS-5-150CC-PETROL.jpg?v=1770739705"},{"product_id":"ums-5-cylinder-100cc-petrol-radial-engine-4-stroke-scale-aircraft-powerplant","title":"UMS 5-Cylinder 100cc Petrol Radial Engine – 4-Stroke Scale Aircraft Powerplant","description":"\u003cp data-start=\"375\" data-end=\"721\"\u003eThe \u003cstrong data-start=\"379\" data-end=\"424\"\u003eUMS 5-Cylinder 100cc Petrol Radial Engine\u003c\/strong\u003e is a compact, lightweight 4-stroke radial engine delivering \u003cstrong data-start=\"485\" data-end=\"561\"\u003eauthentic scale appearance, smooth operation, and dependable performance\u003c\/strong\u003e. Designed for smaller scale and lightweight radial projects, it offers true radial sound and engineering precision in an easy-to-install, ready-to-run package.\u003c\/p\u003e\n\u003ch2 data-start=\"728\" data-end=\"756\"\u003e\u003cstrong data-start=\"731\" data-end=\"754\"\u003eProduct Description\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"758\" data-end=\"1100\"\u003eThe \u003cstrong data-start=\"762\" data-end=\"800\"\u003eUMS 5-Cylinder 100cc Radial Engine\u003c\/strong\u003e is engineered for builders who demand \u003cstrong data-start=\"839\" data-end=\"897\"\u003evisual authenticity and refined mechanical performance\u003c\/strong\u003e in compact scale aircraft. Its classic 5-cylinder radial layout closely replicates full-size aviation engines while delivering smooth, balanced power suitable for detailed scale and vintage RC aircraft.\u003c\/p\u003e\n\u003cp data-start=\"1102\" data-end=\"1479\"\u003eWith a \u003cstrong data-start=\"1109\" data-end=\"1131\"\u003e100cc displacement\u003c\/strong\u003e, this engine is ideal for lighter warbirds, vintage models, and scale aircraft where realism and weight efficiency are critical. Supplied \u003cstrong data-start=\"1270\" data-end=\"1286\"\u003eready to run\u003c\/strong\u003e, it includes an exhaust collector ring, electronic ignition system, spark plugs, and a sturdy engine mount, ensuring a straightforward installation and reliable operation from the first start.\u003c\/p\u003e\n\u003cp data-start=\"1481\" data-end=\"1868\"\u003ePrecision manufacturing is at the heart of this engine. All major components are \u003cstrong data-start=\"1562\" data-end=\"1606\"\u003eCNC-machined from aluminium or bar stock\u003c\/strong\u003e, maintaining tight tolerances for consistent performance. \u003cstrong data-start=\"1665\" data-end=\"1719\"\u003eAircraft-grade alloy cylinder heads and crankcases\u003c\/strong\u003e provide strength and durability without unnecessary weight. A \u003cstrong data-start=\"1782\" data-end=\"1822\"\u003eheavy-duty double-bearing crankshaft\u003c\/strong\u003e ensures smooth running and reduced vibration.\u003c\/p\u003e\n\u003cp data-start=\"1870\" data-end=\"2169\"\u003eInternally, \u003cstrong data-start=\"1882\" data-end=\"1936\"\u003ebillet aluminium pistons with hardened steel rings\u003c\/strong\u003e deliver excellent sealing and longevity, while \u003cstrong data-start=\"1984\" data-end=\"2026\"\u003ehard-chromed and lapped cylinder bores\u003c\/strong\u003e reduce wear and enhance efficiency. Hardened steel camshafts ensure accurate valve timing and long-term reliability under sustained operation.\u003c\/p\u003e\n\u003cp data-start=\"2171\" data-end=\"2475\"\u003eDesigned to operate on \u003cstrong data-start=\"2194\" data-end=\"2218\"\u003e87–110 octane petrol\u003c\/strong\u003e with a \u003cstrong data-start=\"2226\" data-end=\"2254\"\u003e32:1 fuel-to-oil mixture\u003c\/strong\u003e, the UMS 5-100cc radial engine combines traditional radial character with modern engineering, making it a perfect choice for scale builders seeking \u003cstrong data-start=\"2403\" data-end=\"2474\"\u003erealistic sound, refined performance, and dependable 4-stroke power\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2 data-start=\"2482\" data-end=\"2503\"\u003e\u003cstrong data-start=\"2485\" data-end=\"2501\"\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2504\" data-end=\"3203\"\u003e\n\u003cli data-start=\"2504\" data-end=\"2573\"\u003e\n\u003cp data-start=\"2506\" data-end=\"2573\"\u003e5-cylinder 4-stroke radial engine with authentic scale appearance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2574\" data-end=\"2633\"\u003e\n\u003cp data-start=\"2576\" data-end=\"2633\"\u003e100cc displacement ideal for lightweight scale aircraft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2634\" data-end=\"2723\"\u003e\n\u003cp data-start=\"2636\" data-end=\"2723\"\u003eReady-to-run package including ignition, plugs, exhaust collector ring \u0026amp; engine mount\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2724\" data-end=\"2787\"\u003e\n\u003cp data-start=\"2726\" data-end=\"2787\"\u003ePrecision CNC-machined aluminium and bar stock construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2788\" data-end=\"2842\"\u003e\n\u003cp data-start=\"2790\" data-end=\"2842\"\u003eAircraft-grade alloy cylinder heads and crankcases\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2843\" data-end=\"2904\"\u003e\n\u003cp data-start=\"2845\" data-end=\"2904\"\u003eHeavy-duty double-bearing crankshaft for smooth operation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2905\" data-end=\"2966\"\u003e\n\u003cp data-start=\"2907\" data-end=\"2966\"\u003eBillet aluminium pistons with hardened steel piston rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2967\" data-end=\"3024\"\u003e\n\u003cp data-start=\"2969\" data-end=\"3024\"\u003eHard-chromed and lapped cylinder bores for durability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3025\" data-end=\"3079\"\u003e\n\u003cp data-start=\"3027\" data-end=\"3079\"\u003eHardened steel camshafts for long-term reliability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3080\" data-end=\"3146\"\u003e\n\u003cp data-start=\"3082\" data-end=\"3146\"\u003eIntegrated choke and throttle bellcranks for easy installation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3147\" data-end=\"3203\"\u003e\n\u003cp data-start=\"3149\" data-end=\"3203\"\u003eCompatible with 87–110 octane petrol (32:1 fuel mix)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3210\" data-end=\"3230\"\u003e\u003cstrong data-start=\"3213\" data-end=\"3228\"\u003ePerfect For\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"3231\" data-end=\"3483\"\u003e\n\u003cli data-start=\"3231\" data-end=\"3285\"\u003e\n\u003cp data-start=\"3233\" data-end=\"3285\"\u003eLightweight scale RC warbirds and vintage aircraft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3286\" data-end=\"3326\"\u003e\n\u003cp data-start=\"3288\" data-end=\"3326\"\u003eSmaller radial-engine scale projects\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3327\" data-end=\"3387\"\u003e\n\u003cp data-start=\"3329\" data-end=\"3387\"\u003eBuilders prioritising realism with reduced engine weight\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3388\" data-end=\"3430\"\u003e\n\u003cp data-start=\"3390\" data-end=\"3430\"\u003eSmooth, reliable 4-stroke petrol power\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3431\" data-end=\"3483\"\u003e\n\u003cp data-start=\"3433\" data-end=\"3483\"\u003eAdvanced hobbyists and precision scale modellers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3490\" data-end=\"3513\"\u003e\u003cstrong data-start=\"3493\" data-end=\"3511\"\u003eSpecifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3515\" data-end=\"3853\"\u003e\u003cstrong data-start=\"3515\" data-end=\"3531\"\u003eEngine Type:\u003c\/strong\u003e 4-Stroke\u003cbr data-start=\"3540\" data-end=\"3543\"\u003e\u003cstrong data-start=\"3543\" data-end=\"3557\"\u003eCylinders:\u003c\/strong\u003e 5 (ABC Type)\u003cbr data-start=\"3570\" data-end=\"3573\"\u003e\u003cstrong data-start=\"3573\" data-end=\"3590\"\u003eDisplacement:\u003c\/strong\u003e 100cc\u003cbr data-start=\"3596\" data-end=\"3599\"\u003e\u003cstrong data-start=\"3599\" data-end=\"3608\"\u003eBore:\u003c\/strong\u003e 28mm\u003cbr data-start=\"3613\" data-end=\"3616\"\u003e\u003cstrong data-start=\"3616\" data-end=\"3627\"\u003eStroke:\u003c\/strong\u003e 32mm\u003cbr data-start=\"3632\" data-end=\"3635\"\u003e\u003cstrong data-start=\"3635\" data-end=\"3654\"\u003eApprox. Thrust:\u003c\/strong\u003e 12.5kgf @ 24×10 SEP prop\u003cbr data-start=\"3679\" data-end=\"3682\"\u003e\u003cstrong data-start=\"3682\" data-end=\"3696\"\u003eRPM Range:\u003c\/strong\u003e 1,000 – 6,000\u003cbr data-start=\"3710\" data-end=\"3713\"\u003e\u003cstrong data-start=\"3713\" data-end=\"3751\"\u003eWeight (with silencer \u0026amp; ignition):\u003c\/strong\u003e Approx. 3.6kg\u003cbr data-start=\"3765\" data-end=\"3768\"\u003e\u003cstrong data-start=\"3768\" data-end=\"3788\"\u003eEngine Diameter:\u003c\/strong\u003e 240mm\u003cbr data-start=\"3794\" data-end=\"3797\"\u003e\u003cstrong data-start=\"3797\" data-end=\"3815\"\u003eEngine Length:\u003c\/strong\u003e 162mm\u003cbr data-start=\"3821\" data-end=\"3824\"\u003e\u003cstrong data-start=\"3824\" data-end=\"3851\"\u003eRecommended Propellers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"3854\" data-end=\"4024\"\u003e\n\u003cli data-start=\"3854\" data-end=\"3870\"\u003e\n\u003cp data-start=\"3856\" data-end=\"3870\"\u003e2-Blade 24×8\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3871\" data-end=\"4024\"\u003e\n\u003cp data-start=\"3873\" data-end=\"4024\"\u003e2-Blade 24×10\u003cbr data-start=\"3886\" data-end=\"3889\"\u003e\u003cstrong data-start=\"3889\" data-end=\"3906\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3873\" data-end=\"4024\"\u003e\u003cstrong data-start=\"3889\" data-end=\"3906\"\u003eMuffler Type:\u003c\/strong\u003e Collector Ring\u003cbr data-start=\"3921\" data-end=\"3924\"\u003e\u003cstrong data-start=\"3924\" data-end=\"3939\"\u003eSpark Plug:\u003c\/strong\u003e 1\/4-32\u003cbr data-start=\"3946\" data-end=\"3949\"\u003e\u003cstrong data-start=\"3949\" data-end=\"3965\"\u003eCarburettor:\u003c\/strong\u003e Walbro\u003cbr data-start=\"3972\" data-end=\"3975\"\u003e\u003cstrong data-start=\"3975\" data-end=\"3989\"\u003eFuel Type:\u003c\/strong\u003e Petrol (87–110 octane, 32:1 mix)\u003c\/p\u003e\n\u003ch3 data-end=\"3529\" data-start=\"3491\"\u003e\u003cstrong data-end=\"3529\" data-start=\"3495\"\u003eWhy Buy from Probuild Aircraft\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e✅ Official UK stockist – 100% genuine UMS engines\u003cbr data-end=\"3582\" data-start=\"3579\"\u003e✅ Trusted by top international pilots and builders\u003cbr data-end=\"3635\" data-start=\"3632\"\u003e✅ Fast UK shipping and secure packaging\u003cbr data-end=\"3677\" data-start=\"3674\"\u003e✅ Supplying and supporting pilots since 1993\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003eManual:\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e\u003ca rel=\"noopener\" href=\"https:\/\/ch-ignitions.com\/wp-content\/uploads\/2020\/03\/ums-gas-radial-engine-manual-9-115.pdf\" target=\"_blank\"\u003e\u003cimg height=\"351\" width=\"233\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/Screenshot_2026-02-04_115553.png?v=1770206937\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"UMS Engines","offers":[{"title":"Default Title","offer_id":56337476813186,"sku":"UMS5-100","price":1665.83,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/UMS-5-100CC-PETROL.jpg?v=1770741167"},{"product_id":"ums-5-cylinder-75cc-petrol-radial-engine-4-stroke-scale-aircraft-powerplant","title":"UMS 5-Cylinder 75cc Petrol Radial Engine – 4-Stroke Scale Aircraft Powerplant","description":"\u003cp data-start=\"301\" data-end=\"623\"\u003eThe \u003cstrong data-start=\"305\" data-end=\"349\"\u003eUMS 5-Cylinder 75cc Petrol Radial Engine\u003c\/strong\u003e delivers authentic radial sound, realistic scale appearance, and smooth 4-stroke performance in a compact, lightweight package. Supplied ready to run, it is the ideal powerplant for smaller scale warbirds and vintage aircraft requiring dependable petrol radial performance.\u003c\/p\u003e\n\u003ch2 data-start=\"630\" data-end=\"658\"\u003e\u003cstrong data-start=\"633\" data-end=\"656\"\u003eProduct Description\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"660\" data-end=\"966\"\u003eThe \u003cstrong data-start=\"664\" data-end=\"701\"\u003eUMS 5-Cylinder 75cc Radial Engine\u003c\/strong\u003e combines classic radial realism with modern precision engineering. Designed specifically for scale aircraft builders, this 4-stroke petrol engine offers the distinctive sound, appearance, and smooth power delivery associated with full-size radial aircraft engines.\u003c\/p\u003e\n\u003cp data-start=\"968\" data-end=\"1329\"\u003eWith a \u003cstrong data-start=\"975\" data-end=\"996\"\u003e75cc displacement\u003c\/strong\u003e, this engine is perfectly suited to smaller scale warbirds, vintage models, and detailed replica builds where weight, balance, and authenticity matter. Delivered \u003cstrong data-start=\"1159\" data-end=\"1175\"\u003eready to run\u003c\/strong\u003e, it includes an exhaust collector ring, spark plugs, electronic ignition system, and engine mount for straightforward installation and reliable starting.\u003c\/p\u003e\n\u003cp data-start=\"1331\" data-end=\"1626\"\u003eAll major components are \u003cstrong data-start=\"1356\" data-end=\"1410\"\u003eprecision CNC-machined from aluminium or bar stock\u003c\/strong\u003e, ensuring consistent manufacturing tolerances and dependable performance. The \u003cstrong data-start=\"1489\" data-end=\"1543\"\u003eaircraft-grade alloy cylinder heads and crankcases\u003c\/strong\u003e provide excellent strength-to-weight ratio and thermal stability during operation.\u003c\/p\u003e\n\u003cp data-start=\"1628\" data-end=\"1996\"\u003eA \u003cstrong data-start=\"1630\" data-end=\"1670\"\u003eheavy-duty double-bearing crankshaft\u003c\/strong\u003e ensures smooth, vibration-controlled performance and long service life. Internally, billet aluminium pistons fitted with hardened steel rings operate within \u003cstrong data-start=\"1828\" data-end=\"1870\"\u003ehard-chromed and lapped cylinder bores\u003c\/strong\u003e, reducing friction and enhancing durability. Hardened steel camshafts provide precise valve timing and long-term reliability.\u003c\/p\u003e\n\u003cp data-start=\"1998\" data-end=\"2224\"\u003eDesigned to operate on \u003cstrong data-start=\"2021\" data-end=\"2045\"\u003e87–110 octane petrol\u003c\/strong\u003e with a \u003cstrong data-start=\"2053\" data-end=\"2081\"\u003e32:1 fuel-to-oil mixture\u003c\/strong\u003e, this compact radial engine offers flexibility, efficiency, and dependable power for scale aviation enthusiasts seeking true radial character.\u003c\/p\u003e\n\u003ch2 data-start=\"2231\" data-end=\"2252\"\u003e\u003cstrong data-start=\"2234\" data-end=\"2250\"\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2254\" data-end=\"2917\"\u003e\n\u003cli data-start=\"2254\" data-end=\"2323\"\u003e\n\u003cp data-start=\"2256\" data-end=\"2323\"\u003e5-cylinder 4-stroke radial engine with authentic scale appearance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2324\" data-end=\"2378\"\u003e\n\u003cp data-start=\"2326\" data-end=\"2378\"\u003e75cc displacement ideal for smaller scale aircraft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2379\" data-end=\"2456\"\u003e\n\u003cp data-start=\"2381\" data-end=\"2456\"\u003eSupplied ready to run with ignition, plugs, collector ring \u0026amp; engine mount\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2457\" data-end=\"2520\"\u003e\n\u003cp data-start=\"2459\" data-end=\"2520\"\u003ePrecision CNC-machined aluminium and bar stock construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2521\" data-end=\"2575\"\u003e\n\u003cp data-start=\"2523\" data-end=\"2575\"\u003eAircraft-grade alloy cylinder heads and crankcases\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2576\" data-end=\"2637\"\u003e\n\u003cp data-start=\"2578\" data-end=\"2637\"\u003eHeavy-duty double-bearing crankshaft for smooth operation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2638\" data-end=\"2692\"\u003e\n\u003cp data-start=\"2640\" data-end=\"2692\"\u003eBillet aluminium pistons with hardened steel rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2693\" data-end=\"2750\"\u003e\n\u003cp data-start=\"2695\" data-end=\"2750\"\u003eHard-chromed and lapped cylinder bores for durability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2751\" data-end=\"2805\"\u003e\n\u003cp data-start=\"2753\" data-end=\"2805\"\u003eHardened steel camshafts for reliable valve timing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2806\" data-end=\"2865\"\u003e\n\u003cp data-start=\"2808\" data-end=\"2865\"\u003eIntegrated choke and throttle bellcranks for easy setup\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2866\" data-end=\"2917\"\u003e\n\u003cp data-start=\"2868\" data-end=\"2917\"\u003eCompatible with 87–110 octane petrol (32:1 mix)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"2924\" data-end=\"2944\"\u003e\u003cstrong data-start=\"2927\" data-end=\"2942\"\u003ePerfect For\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2946\" data-end=\"3149\"\u003e\n\u003cli data-start=\"2946\" data-end=\"2975\"\u003e\n\u003cp data-start=\"2948\" data-end=\"2975\"\u003eSmaller scale RC warbirds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2976\" data-end=\"3015\"\u003e\n\u003cp data-start=\"2978\" data-end=\"3015\"\u003eVintage and classic aircraft builds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3016\" data-end=\"3058\"\u003e\n\u003cp data-start=\"3018\" data-end=\"3058\"\u003eLightweight radial engine applications\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3059\" data-end=\"3102\"\u003e\n\u003cp data-start=\"3061\" data-end=\"3102\"\u003eBuilders seeking realistic radial sound\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3103\" data-end=\"3149\"\u003e\n\u003cp data-start=\"3105\" data-end=\"3149\"\u003eAdvanced hobbyists and precision modellers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3156\" data-end=\"3179\"\u003e\u003cstrong data-start=\"3159\" data-end=\"3177\"\u003eSpecifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3181\" data-end=\"3514\"\u003e\u003cstrong data-start=\"3181\" data-end=\"3197\"\u003eEngine Type:\u003c\/strong\u003e 4-Stroke\u003cbr data-start=\"3206\" data-end=\"3209\"\u003e\u003cstrong data-start=\"3209\" data-end=\"3223\"\u003eCylinders:\u003c\/strong\u003e 5 (ABC Type)\u003cbr data-start=\"3236\" data-end=\"3239\"\u003e\u003cstrong data-start=\"3239\" data-end=\"3256\"\u003eDisplacement:\u003c\/strong\u003e 75cc\u003cbr data-start=\"3261\" data-end=\"3264\"\u003e\u003cstrong data-start=\"3264\" data-end=\"3273\"\u003eBore:\u003c\/strong\u003e 26.5mm\u003cbr data-start=\"3280\" data-end=\"3283\"\u003e\u003cstrong data-start=\"3283\" data-end=\"3294\"\u003eStroke:\u003c\/strong\u003e 27.5mm\u003cbr data-start=\"3301\" data-end=\"3304\"\u003e\u003cstrong data-start=\"3304\" data-end=\"3323\"\u003eApprox. Thrust:\u003c\/strong\u003e 9kgf @ 24×8 prop\u003cbr data-start=\"3340\" data-end=\"3343\"\u003e\u003cstrong data-start=\"3343\" data-end=\"3357\"\u003eRPM Range:\u003c\/strong\u003e 1,000 – 6,000\u003cbr data-start=\"3371\" data-end=\"3374\"\u003e\u003cstrong data-start=\"3374\" data-end=\"3412\"\u003eWeight (with silencer \u0026amp; ignition):\u003c\/strong\u003e Approx. 3.0kg\u003cbr data-start=\"3426\" data-end=\"3429\"\u003e\u003cstrong data-start=\"3429\" data-end=\"3449\"\u003eEngine Diameter:\u003c\/strong\u003e 230mm\u003cbr data-start=\"3455\" data-end=\"3458\"\u003e\u003cstrong data-start=\"3458\" data-end=\"3476\"\u003eEngine Length:\u003c\/strong\u003e 162mm\u003cbr data-start=\"3482\" data-end=\"3485\"\u003e\u003cstrong data-start=\"3485\" data-end=\"3512\"\u003eRecommended Propellers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"3515\" data-end=\"3685\"\u003e\n\u003cli data-start=\"3515\" data-end=\"3531\"\u003e\n\u003cp data-start=\"3517\" data-end=\"3531\"\u003e2-Blade 24×8\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3532\" data-end=\"3685\"\u003e\n\u003cp data-start=\"3534\" data-end=\"3685\"\u003e2-Blade 24×10\u003cbr data-start=\"3547\" data-end=\"3550\"\u003e\u003cstrong data-start=\"3550\" data-end=\"3567\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3534\" data-end=\"3685\"\u003e\u003cstrong data-start=\"3550\" data-end=\"3567\"\u003eMuffler Type:\u003c\/strong\u003e Collector Ring\u003cbr data-start=\"3582\" data-end=\"3585\"\u003e\u003cstrong data-start=\"3585\" data-end=\"3600\"\u003eSpark Plug:\u003c\/strong\u003e 1\/4-32\u003cbr data-start=\"3607\" data-end=\"3610\"\u003e\u003cstrong data-start=\"3610\" data-end=\"3626\"\u003eCarburettor:\u003c\/strong\u003e Walbro\u003cbr data-start=\"3633\" data-end=\"3636\"\u003e\u003cstrong data-start=\"3636\" data-end=\"3650\"\u003eFuel Type:\u003c\/strong\u003e Petrol (87–110 octane, 32:1 mix)\u003c\/p\u003e\n\u003ch3 data-end=\"3529\" data-start=\"3491\"\u003e\u003cstrong data-end=\"3529\" data-start=\"3495\"\u003eWhy Buy from Probuild Aircraft\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e✅ Official UK stockist – 100% genuine UMS engines\u003cbr data-end=\"3582\" data-start=\"3579\"\u003e✅ Trusted by top international pilots and builders\u003cbr data-end=\"3635\" data-start=\"3632\"\u003e✅ Fast UK shipping and secure packaging\u003cbr data-end=\"3677\" data-start=\"3674\"\u003e✅ Supplying and supporting pilots since 1993\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003eManual:\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e\u003ca rel=\"noopener\" href=\"https:\/\/ch-ignitions.com\/wp-content\/uploads\/2020\/03\/ums-gas-radial-engine-manual-9-115.pdf\" target=\"_blank\"\u003e\u003cimg height=\"351\" width=\"233\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/Screenshot_2026-02-04_115553.png?v=1770206937\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"UMS Engines","offers":[{"title":"Default Title","offer_id":56341520023938,"sku":"UMS5-75","price":1541.67,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/UMS-5-75CC-PETROL.jpg?v=1770805263"},{"product_id":"ums-5-cylinder-55cc-petrol-radial-engine-4-stroke-scale-aircraft-powerplant","title":"UMS 5-Cylinder 55cc Petrol Radial Engine – 4-Stroke Scale Aircraft Powerplant","description":"\u003cp data-start=\"301\" data-end=\"615\"\u003eThe \u003cstrong data-start=\"305\" data-end=\"349\"\u003eUMS 5-Cylinder 55cc Petrol Radial Engine\u003c\/strong\u003e delivers authentic radial appearance, smooth 4-stroke performance, and dependable engineering in a compact, lightweight format. Designed for smaller scale aircraft, this ready-to-run petrol radial offers realistic sound, refined machining, and long-term durability.\u003c\/p\u003e\n\u003ch2 data-start=\"622\" data-end=\"650\"\u003e\u003cstrong data-start=\"625\" data-end=\"648\"\u003eProduct Description\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"652\" data-end=\"955\"\u003eThe \u003cstrong data-start=\"656\" data-end=\"693\"\u003eUMS 5-Cylinder 55cc Radial Engine\u003c\/strong\u003e is the smallest in the UMS 5-cylinder radial range, offering true radial realism in a compact and lightweight package. Perfect for detailed scale models and vintage aircraft builds, it combines authentic sound and appearance with modern manufacturing precision.\u003c\/p\u003e\n\u003cp data-start=\"957\" data-end=\"1273\"\u003eWith a \u003cstrong data-start=\"964\" data-end=\"985\"\u003e55cc displacement\u003c\/strong\u003e, this engine provides reliable and efficient power for lightweight scale aircraft where balance and weight are critical. Supplied \u003cstrong data-start=\"1116\" data-end=\"1132\"\u003eready to run\u003c\/strong\u003e, it includes an exhaust collector ring, spark plugs, electronic ignition system, and a sturdy engine mount for straightforward installation.\u003c\/p\u003e\n\u003cp data-start=\"1275\" data-end=\"1528\"\u003eAll major components are \u003cstrong data-start=\"1300\" data-end=\"1344\"\u003eCNC-machined from aluminium or bar stock\u003c\/strong\u003e, ensuring accuracy, repeatability, and durability. The \u003cstrong data-start=\"1400\" data-end=\"1454\"\u003eaircraft-grade alloy cylinder heads and crankcases\u003c\/strong\u003e provide strength while maintaining an excellent strength-to-weight ratio.\u003c\/p\u003e\n\u003cp data-start=\"1530\" data-end=\"1870\"\u003eA \u003cstrong data-start=\"1532\" data-end=\"1572\"\u003eheavy-duty double-bearing crankshaft\u003c\/strong\u003e ensures smooth operation and extended service life. Billet aluminium pistons fitted with hardened steel rings operate within \u003cstrong data-start=\"1698\" data-end=\"1729\"\u003ehard-chromed cylinder bores\u003c\/strong\u003e, reducing friction and enhancing wear resistance. Hardened steel camshafts ensure reliable valve timing and long-term operational stability.\u003c\/p\u003e\n\u003cp data-start=\"1872\" data-end=\"2079\"\u003eDesigned to operate on \u003cstrong data-start=\"1895\" data-end=\"1919\"\u003e87–110 octane petrol\u003c\/strong\u003e with a \u003cstrong data-start=\"1927\" data-end=\"1955\"\u003e32:1 fuel-to-oil mixture\u003c\/strong\u003e, this compact radial engine provides dependable 4-stroke performance and authentic scale character for discerning builders.\u003c\/p\u003e\n\u003ch2 data-start=\"2086\" data-end=\"2105\"\u003e\u003cstrong data-start=\"2089\" data-end=\"2105\"\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2107\" data-end=\"2784\"\u003e\n\u003cli data-start=\"2107\" data-end=\"2176\"\u003e\n\u003cp data-start=\"2109\" data-end=\"2176\"\u003e5-cylinder 4-stroke radial engine with authentic scale appearance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2177\" data-end=\"2247\"\u003e\n\u003cp data-start=\"2179\" data-end=\"2247\"\u003e55cc displacement ideal for lightweight and smaller scale aircraft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2248\" data-end=\"2329\"\u003e\n\u003cp data-start=\"2250\" data-end=\"2329\"\u003eReady-to-run package including ignition, plugs, collector ring \u0026amp; engine mount\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2330\" data-end=\"2393\"\u003e\n\u003cp data-start=\"2332\" data-end=\"2393\"\u003ePrecision CNC-machined aluminium and bar stock construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2394\" data-end=\"2448\"\u003e\n\u003cp data-start=\"2396\" data-end=\"2448\"\u003eAircraft-grade alloy cylinder heads and crankcases\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2449\" data-end=\"2510\"\u003e\n\u003cp data-start=\"2451\" data-end=\"2510\"\u003eHeavy-duty double-bearing crankshaft for smooth operation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2511\" data-end=\"2565\"\u003e\n\u003cp data-start=\"2513\" data-end=\"2565\"\u003eBillet aluminium pistons with hardened steel rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2566\" data-end=\"2629\"\u003e\n\u003cp data-start=\"2568\" data-end=\"2629\"\u003eHard-chromed cylinder bores for durability and reduced wear\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2630\" data-end=\"2684\"\u003e\n\u003cp data-start=\"2632\" data-end=\"2684\"\u003eHardened steel camshafts for reliable valve timing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2685\" data-end=\"2732\"\u003e\n\u003cp data-start=\"2687\" data-end=\"2732\"\u003eUser-friendly choke and throttle bellcranks\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2733\" data-end=\"2784\"\u003e\n\u003cp data-start=\"2735\" data-end=\"2784\"\u003eCompatible with 87–110 octane petrol (32:1 mix)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"2791\" data-end=\"2809\"\u003e\u003cstrong data-start=\"2794\" data-end=\"2809\"\u003ePerfect For\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2811\" data-end=\"3006\"\u003e\n\u003cli data-start=\"2811\" data-end=\"2840\"\u003e\n\u003cp data-start=\"2813\" data-end=\"2840\"\u003eSmaller scale RC warbirds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2841\" data-end=\"2880\"\u003e\n\u003cp data-start=\"2843\" data-end=\"2880\"\u003eVintage and classic aircraft builds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2881\" data-end=\"2923\"\u003e\n\u003cp data-start=\"2883\" data-end=\"2923\"\u003eLightweight radial engine applications\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2924\" data-end=\"2967\"\u003e\n\u003cp data-start=\"2926\" data-end=\"2967\"\u003eBuilders seeking authentic radial sound\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2968\" data-end=\"3006\"\u003e\n\u003cp data-start=\"2970\" data-end=\"3006\"\u003ePrecision scale modelling projects\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3013\" data-end=\"3034\"\u003e\u003cstrong data-start=\"3016\" data-end=\"3034\"\u003eSpecifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3036\" data-end=\"3374\"\u003e\u003cstrong data-start=\"3036\" data-end=\"3052\"\u003eEngine Type:\u003c\/strong\u003e 4-Stroke\u003cbr data-start=\"3061\" data-end=\"3064\"\u003e\u003cstrong data-start=\"3064\" data-end=\"3078\"\u003eCylinders:\u003c\/strong\u003e 5 (ABC Type)\u003cbr data-start=\"3091\" data-end=\"3094\"\u003e\u003cstrong data-start=\"3094\" data-end=\"3111\"\u003eDisplacement:\u003c\/strong\u003e 55cc\u003cbr data-start=\"3116\" data-end=\"3119\"\u003e\u003cstrong data-start=\"3119\" data-end=\"3128\"\u003eBore:\u003c\/strong\u003e 23.7mm\u003cbr data-start=\"3135\" data-end=\"3138\"\u003e\u003cstrong data-start=\"3138\" data-end=\"3149\"\u003eStroke:\u003c\/strong\u003e 25mm\u003cbr data-start=\"3154\" data-end=\"3157\"\u003e\u003cstrong data-start=\"3157\" data-end=\"3176\"\u003eApprox. Thrust:\u003c\/strong\u003e 7.5kgf @ 20×8 SEP prop\u003cbr data-start=\"3199\" data-end=\"3202\"\u003e\u003cstrong data-start=\"3202\" data-end=\"3216\"\u003eRPM Range:\u003c\/strong\u003e 1,000 – 6,000\u003cbr data-start=\"3230\" data-end=\"3233\"\u003e\u003cstrong data-start=\"3233\" data-end=\"3271\"\u003eWeight (with silencer \u0026amp; ignition):\u003c\/strong\u003e Approx. 2.35kg\u003cbr data-start=\"3286\" data-end=\"3289\"\u003e\u003cstrong data-start=\"3289\" data-end=\"3309\"\u003eEngine Diameter:\u003c\/strong\u003e 201mm\u003cbr data-start=\"3315\" data-end=\"3318\"\u003e\u003cstrong data-start=\"3318\" data-end=\"3336\"\u003eEngine Length:\u003c\/strong\u003e 142mm\u003cbr data-start=\"3342\" data-end=\"3345\"\u003e\u003cstrong data-start=\"3345\" data-end=\"3372\"\u003eRecommended Propellers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"3375\" data-end=\"3614\"\u003e\n\u003cli data-start=\"3375\" data-end=\"3391\"\u003e\n\u003cp data-start=\"3377\" data-end=\"3391\"\u003e2-Blade 17×8\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3392\" data-end=\"3409\"\u003e\n\u003cp data-start=\"3394\" data-end=\"3409\"\u003e2-Blade 17×10\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3410\" data-end=\"3427\"\u003e\n\u003cp data-start=\"3412\" data-end=\"3427\"\u003e2-Blade 17×12\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3428\" data-end=\"3444\"\u003e\n\u003cp data-start=\"3430\" data-end=\"3444\"\u003e2-Blade 18×6\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3445\" data-end=\"3461\"\u003e\n\u003cp data-start=\"3447\" data-end=\"3461\"\u003e2-Blade 18×8\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3462\" data-end=\"3614\"\u003e\n\u003cp data-start=\"3464\" data-end=\"3614\"\u003e2-Blade 20×8\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3464\" data-end=\"3614\"\u003e\u003cstrong data-start=\"3479\" data-end=\"3496\"\u003eMuffler Type:\u003c\/strong\u003e Collector Ring\u003cbr data-start=\"3511\" data-end=\"3514\"\u003e\u003cstrong data-start=\"3514\" data-end=\"3529\"\u003eSpark Plug:\u003c\/strong\u003e 1\/4-32\u003cbr data-start=\"3536\" data-end=\"3539\"\u003e\u003cstrong data-start=\"3539\" data-end=\"3555\"\u003eCarburettor:\u003c\/strong\u003e UMS T2\u003cbr data-start=\"3562\" data-end=\"3565\"\u003e\u003cstrong data-start=\"3565\" data-end=\"3579\"\u003eFuel Type:\u003c\/strong\u003e Petrol (87–110 octane, 32:1 mix)\u003c\/p\u003e\n\u003ch3 data-end=\"3529\" data-start=\"3491\"\u003e\u003cstrong data-end=\"3529\" data-start=\"3495\"\u003eWhy Buy from Probuild Aircraft\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e✅ Official UK stockist – 100% genuine UMS engines\u003cbr data-end=\"3582\" data-start=\"3579\"\u003e✅ Trusted by top international pilots and builders\u003cbr data-end=\"3635\" data-start=\"3632\"\u003e✅ Fast UK shipping and secure packaging\u003cbr data-end=\"3677\" data-start=\"3674\"\u003e✅ Supplying and supporting pilots since 1993\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003eManual:\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e\u003ca rel=\"noopener\" href=\"https:\/\/ch-ignitions.com\/wp-content\/uploads\/2020\/03\/ums-gas-radial-engine-manual-9-115.pdf\" target=\"_blank\"\u003e\u003cimg height=\"351\" width=\"233\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/Screenshot_2026-02-04_115553.png?v=1770206937\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"UMS Engines","offers":[{"title":"Default Title","offer_id":56341553611138,"sku":"UMS5-55","price":1291.67,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/UMS-5-55CC-PETROL.jpg?v=1770806103"},{"product_id":"ums-7-cylinder-26cc-petrol-radial-engine-4-stroke-scale-aircraft-powerplant","title":"UMS 7-Cylinder 260cc Petrol Radial Engine – 4-Stroke Scale Aircraft Powerplant","description":"\u003cp data-start=\"303\" data-end=\"606\"\u003eThe \u003cstrong data-start=\"307\" data-end=\"352\"\u003eUMS 7-Cylinder 260cc Petrol Radial Engine\u003c\/strong\u003e delivers true multi-cylinder radial realism, smooth 4-stroke power, and exceptional engineering precision. Designed for large-scale aircraft, this ready-to-run petrol radial combines authentic appearance, balanced performance, and long-term reliability.\u003c\/p\u003e\n\u003ch2 data-start=\"613\" data-end=\"639\"\u003e\u003cstrong data-start=\"616\" data-end=\"639\"\u003eProduct Description\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"641\" data-end=\"962\"\u003eThe \u003cstrong data-start=\"645\" data-end=\"683\"\u003eUMS 7-Cylinder 260cc Radial Engine\u003c\/strong\u003e is engineered for serious scale builders who demand both \u003cstrong data-start=\"741\" data-end=\"792\"\u003evisual authenticity and high-performance output\u003c\/strong\u003e. Its classic 7-cylinder radial configuration replicates the look and sound of full-size aviation engines while providing smooth, balanced operation across the RPM range.\u003c\/p\u003e\n\u003cp data-start=\"964\" data-end=\"1320\"\u003eWith a substantial \u003cstrong data-start=\"983\" data-end=\"1005\"\u003e260cc displacement\u003c\/strong\u003e, this engine is ideal for large-scale warbirds, vintage aircraft, and detailed replica projects requiring reliable torque and strong pulling power. Supplied \u003cstrong data-start=\"1163\" data-end=\"1179\"\u003eready to run\u003c\/strong\u003e, it includes an exhaust collector ring, electronic ignition system, spark plugs, and a robust engine mount for straightforward installation.\u003c\/p\u003e\n\u003cp data-start=\"1322\" data-end=\"1597\"\u003eAll primary components are \u003cstrong data-start=\"1349\" data-end=\"1404\"\u003eprecision CNC-machined from aluminium and bar stock\u003c\/strong\u003e, ensuring tight tolerances and consistent performance. The \u003cstrong data-start=\"1464\" data-end=\"1518\"\u003eaircraft-grade alloy cylinder heads and crankcases\u003c\/strong\u003e provide strength while maintaining optimal weight balance for large airframes.\u003c\/p\u003e\n\u003cp data-start=\"1599\" data-end=\"1964\"\u003eInternally, a \u003cstrong data-start=\"1613\" data-end=\"1653\"\u003eheavy-duty double-bearing crankshaft\u003c\/strong\u003e enhances smoothness and durability under sustained loads. Billet aluminium pistons fitted with hardened steel rings operate within \u003cstrong data-start=\"1785\" data-end=\"1827\"\u003ehard-chromed and lapped cylinder bores\u003c\/strong\u003e, reducing friction and increasing longevity. Hardened steel camshafts ensure accurate valve timing and dependable long-term reliability.\u003c\/p\u003e\n\u003cp data-start=\"1966\" data-end=\"2208\"\u003eDesigned to run on \u003cstrong data-start=\"1985\" data-end=\"2009\"\u003e87–110 octane petrol\u003c\/strong\u003e with a \u003cstrong data-start=\"2017\" data-end=\"2045\"\u003e32:1 fuel-to-oil mixture\u003c\/strong\u003e, the UMS 7-260cc radial engine provides dependable 4-stroke performance, authentic radial sound, and commanding scale presence for demanding aviation enthusiasts.\u003c\/p\u003e\n\u003ch2 data-start=\"2215\" data-end=\"2234\"\u003e\u003cstrong data-start=\"2218\" data-end=\"2234\"\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2236\" data-end=\"2916\"\u003e\n\u003cli data-start=\"2236\" data-end=\"2305\"\u003e\n\u003cp data-start=\"2238\" data-end=\"2305\"\u003e7-cylinder 4-stroke radial engine with authentic scale appearance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2306\" data-end=\"2360\"\u003e\n\u003cp data-start=\"2308\" data-end=\"2360\"\u003e260cc displacement delivering strong, smooth power\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2361\" data-end=\"2442\"\u003e\n\u003cp data-start=\"2363\" data-end=\"2442\"\u003eReady-to-run package including ignition, plugs, collector ring \u0026amp; engine mount\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2443\" data-end=\"2506\"\u003e\n\u003cp data-start=\"2445\" data-end=\"2506\"\u003ePrecision CNC-machined aluminium and bar stock construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2507\" data-end=\"2561\"\u003e\n\u003cp data-start=\"2509\" data-end=\"2561\"\u003eAircraft-grade alloy cylinder heads and crankcases\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2562\" data-end=\"2631\"\u003e\n\u003cp data-start=\"2564\" data-end=\"2631\"\u003eHeavy-duty double-bearing crankshaft for stability and durability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2632\" data-end=\"2686\"\u003e\n\u003cp data-start=\"2634\" data-end=\"2686\"\u003eBillet aluminium pistons with hardened steel rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2687\" data-end=\"2749\"\u003e\n\u003cp data-start=\"2689\" data-end=\"2749\"\u003eHard-chromed and lapped cylinder bores for wear resistance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2750\" data-end=\"2804\"\u003e\n\u003cp data-start=\"2752\" data-end=\"2804\"\u003eHardened steel camshafts for reliable valve timing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2805\" data-end=\"2864\"\u003e\n\u003cp data-start=\"2807\" data-end=\"2864\"\u003eIntegrated choke and throttle bellcranks for easy setup\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2865\" data-end=\"2916\"\u003e\n\u003cp data-start=\"2867\" data-end=\"2916\"\u003eCompatible with 87–110 octane petrol (32:1 mix)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"2923\" data-end=\"2941\"\u003e\u003cstrong data-start=\"2926\" data-end=\"2941\"\u003ePerfect For\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2943\" data-end=\"3152\"\u003e\n\u003cli data-start=\"2943\" data-end=\"2970\"\u003e\n\u003cp data-start=\"2945\" data-end=\"2970\"\u003eLarge-scale RC warbirds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2971\" data-end=\"3015\"\u003e\n\u003cp data-start=\"2973\" data-end=\"3015\"\u003eVintage and golden-era aircraft replicas\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3016\" data-end=\"3041\"\u003e\n\u003cp data-start=\"3018\" data-end=\"3041\"\u003eHigh-end scale builds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3042\" data-end=\"3096\"\u003e\n\u003cp data-start=\"3044\" data-end=\"3096\"\u003eBuilders seeking authentic 7-cylinder radial sound\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3097\" data-end=\"3152\"\u003e\n\u003cp data-start=\"3099\" data-end=\"3152\"\u003eAdvanced hobbyists and professional scale modellers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3159\" data-end=\"3180\"\u003e\u003cstrong data-start=\"3162\" data-end=\"3180\"\u003eSpecifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3182\" data-end=\"3520\"\u003e\u003cstrong data-start=\"3182\" data-end=\"3198\"\u003eEngine Type:\u003c\/strong\u003e 4-Stroke\u003cbr data-start=\"3207\" data-end=\"3210\"\u003e\u003cstrong data-start=\"3210\" data-end=\"3224\"\u003eCylinders:\u003c\/strong\u003e 7 (ABC Type)\u003cbr data-start=\"3237\" data-end=\"3240\"\u003e\u003cstrong data-start=\"3240\" data-end=\"3257\"\u003eDisplacement:\u003c\/strong\u003e 260cc\u003cbr data-start=\"3263\" data-end=\"3266\"\u003e\u003cstrong data-start=\"3266\" data-end=\"3275\"\u003eBore:\u003c\/strong\u003e 35.7mm\u003cbr data-start=\"3282\" data-end=\"3285\"\u003e\u003cstrong data-start=\"3285\" data-end=\"3296\"\u003eStroke:\u003c\/strong\u003e 37.0mm\u003cbr data-start=\"3303\" data-end=\"3306\"\u003e\u003cstrong data-start=\"3306\" data-end=\"3325\"\u003eApprox. Thrust:\u003c\/strong\u003e 25.4kgf @ 33×14 prop\u003cbr data-start=\"3346\" data-end=\"3349\"\u003e\u003cstrong data-start=\"3349\" data-end=\"3363\"\u003eRPM Range:\u003c\/strong\u003e 1,000 – 5,000\u003cbr data-start=\"3377\" data-end=\"3380\"\u003e\u003cstrong data-start=\"3380\" data-end=\"3418\"\u003eWeight (with silencer \u0026amp; ignition):\u003c\/strong\u003e Approx. 8.0kg\u003cbr data-start=\"3432\" data-end=\"3435\"\u003e\u003cstrong data-start=\"3435\" data-end=\"3455\"\u003eEngine Diameter:\u003c\/strong\u003e 328mm\u003cbr data-start=\"3461\" data-end=\"3464\"\u003e\u003cstrong data-start=\"3464\" data-end=\"3482\"\u003eEngine Length:\u003c\/strong\u003e 215mm\u003cbr data-start=\"3488\" data-end=\"3491\"\u003e\u003cstrong data-start=\"3491\" data-end=\"3518\"\u003eRecommended Propellers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"3521\" data-end=\"3707\"\u003e\n\u003cli data-start=\"3521\" data-end=\"3538\"\u003e\n\u003cp data-start=\"3523\" data-end=\"3538\"\u003e2-Blade 32×12\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3539\" data-end=\"3556\"\u003e\n\u003cp data-start=\"3541\" data-end=\"3556\"\u003e2-Blade 32×14\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3557\" data-end=\"3707\"\u003e\n\u003cp data-start=\"3559\" data-end=\"3707\"\u003e2-Blade 33×14\u003cbr data-start=\"3572\" data-end=\"3575\"\u003e\u003cstrong data-start=\"3575\" data-end=\"3592\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3559\" data-end=\"3707\"\u003e\u003cstrong data-start=\"3575\" data-end=\"3592\"\u003eMuffler Type:\u003c\/strong\u003e Collector Ring\u003cbr data-start=\"3607\" data-end=\"3610\"\u003e\u003cstrong data-start=\"3610\" data-end=\"3625\"\u003eSpark Plug:\u003c\/strong\u003e CM6\u003cbr data-start=\"3629\" data-end=\"3632\"\u003e\u003cstrong data-start=\"3632\" data-end=\"3648\"\u003eCarburettor:\u003c\/strong\u003e Walbro\u003cbr data-start=\"3655\" data-end=\"3658\"\u003e\u003cstrong data-start=\"3658\" data-end=\"3672\"\u003eFuel Type:\u003c\/strong\u003e Petrol (87–110 octane, 32:1 mix)\u003c\/p\u003e\n\u003ch3 data-end=\"3529\" data-start=\"3491\"\u003e\u003cstrong data-end=\"3529\" data-start=\"3495\"\u003eWhy Buy from Probuild Aircraft\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e✅ Official UK stockist – 100% genuine UMS engines\u003cbr data-end=\"3582\" data-start=\"3579\"\u003e✅ Trusted by top international pilots and builders\u003cbr data-end=\"3635\" data-start=\"3632\"\u003e✅ Fast UK shipping and secure packaging\u003cbr data-end=\"3677\" data-start=\"3674\"\u003e✅ Supplying and supporting pilots since 1993\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003eManual:\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e\u003ca rel=\"noopener\" href=\"https:\/\/ch-ignitions.com\/wp-content\/uploads\/2020\/03\/ums-gas-radial-engine-manual-9-115.pdf\" target=\"_blank\"\u003e\u003cimg height=\"351\" width=\"233\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/Screenshot_2026-02-04_115553.png?v=1770206937\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"UMS Engines","offers":[{"title":"Default Title","offer_id":56341622423938,"sku":"UMS7-260","price":2958.33,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/UMS-7-260CC-PETROL.jpg?v=1770807127"},{"product_id":"ums-7-cylinder-160cc-petrol-radial-engine-4-stroke-scale-aircraft-powerplant","title":"UMS 7-Cylinder 90cc Petrol Radial Engine – 4-Stroke Scale Aircraft Powerplant","description":"\u003cp data-start=\"3602\" data-end=\"3750\"\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eThe \u003c\/span\u003e\u003cstrong data-start=\"306\" data-end=\"350\" style=\"font-size: 0.875rem;\"\u003eUMS 7-Cylinder 90cc Petrol Radial Engine\u003c\/strong\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e delivers authentic seven-cylinder radial realism in a compact and lightweight 4-stroke package. Designed for smaller scale aircraft and warbirds, it combines smooth power delivery, CNC precision engineering, and long-term durability.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-start=\"591\" data-end=\"617\"\u003e\u003cstrong data-start=\"594\" data-end=\"617\"\u003eProduct Description\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"619\" data-end=\"1010\"\u003eThe \u003cstrong data-start=\"623\" data-end=\"651\"\u003eUMS 7-90cc Radial Engine\u003c\/strong\u003e is a compact, high-quality 4-stroke petrol engine built for scale aircraft enthusiasts who demand authentic appearance and dependable performance. Its classic \u003cstrong data-start=\"811\" data-end=\"846\"\u003e7-cylinder radial configuration\u003c\/strong\u003e provides the unmistakable look and sound of full-size aviation engines, making it ideal for detailed warbirds, vintage aircraft, and museum-quality scale projects.\u003c\/p\u003e\n\u003cp data-start=\"1012\" data-end=\"1198\"\u003eWith a \u003cstrong data-start=\"1019\" data-end=\"1040\"\u003e90cc displacement\u003c\/strong\u003e, this engine offers strong, balanced power for smaller and mid-size scale aircraft while maintaining a lightweight design for optimal flight characteristics.\u003c\/p\u003e\n\u003cp data-start=\"1200\" data-end=\"1247\"\u003eSupplied \u003cstrong data-start=\"1209\" data-end=\"1225\"\u003eready to run\u003c\/strong\u003e, the engine includes:\u003c\/p\u003e\n\u003cul data-start=\"1249\" data-end=\"1347\"\u003e\n\u003cli data-start=\"1249\" data-end=\"1275\"\u003e\n\u003cp data-start=\"1251\" data-end=\"1275\"\u003eExhaust collector ring\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1276\" data-end=\"1306\"\u003e\n\u003cp data-start=\"1278\" data-end=\"1306\"\u003eElectronic ignition system\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1307\" data-end=\"1322\"\u003e\n\u003cp data-start=\"1309\" data-end=\"1322\"\u003eSpark plugs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1323\" data-end=\"1347\"\u003e\n\u003cp data-start=\"1325\" data-end=\"1347\"\u003eDurable engine mount\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1349\" data-end=\"1535\"\u003eIntegrated \u003cstrong data-start=\"1360\" data-end=\"1393\"\u003echoke and throttle bellcranks\u003c\/strong\u003e simplify installation and ensure smooth throttle response, making setup straightforward for both experienced builders and advanced hobbyists.\u003c\/p\u003e\n\u003cp data-start=\"1537\" data-end=\"1842\"\u003eManufactured using \u003cstrong data-start=\"1556\" data-end=\"1607\"\u003eCNC-machined aluminium and bar stock components\u003c\/strong\u003e, the engine delivers precision tolerances and consistent performance. The \u003cstrong data-start=\"1682\" data-end=\"1736\"\u003eaircraft-grade alloy cylinder heads and crankcases\u003c\/strong\u003e provide excellent strength-to-weight balance, helping maintain correct centre of gravity in scale builds.\u003c\/p\u003e\n\u003cp data-start=\"1844\" data-end=\"1890\"\u003eInternally, durability is prioritised through:\u003c\/p\u003e\n\u003cul data-start=\"1892\" data-end=\"2132\"\u003e\n\u003cli data-start=\"1892\" data-end=\"1962\"\u003e\n\u003cp data-start=\"1894\" data-end=\"1962\"\u003eHeavy-duty double-bearing crankshaft for stable high-RPM operation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1963\" data-end=\"2017\"\u003e\n\u003cp data-start=\"1965\" data-end=\"2017\"\u003eBillet aluminium pistons with hardened steel rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2018\" data-end=\"2077\"\u003e\n\u003cp data-start=\"2020\" data-end=\"2077\"\u003eHard-chromed and lapped cylinder bores for reduced wear\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2078\" data-end=\"2132\"\u003e\n\u003cp data-start=\"2080\" data-end=\"2132\"\u003eHardened steel camshafts for reliable valve timing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2134\" data-end=\"2306\"\u003eDesigned to run on \u003cstrong data-start=\"2153\" data-end=\"2177\"\u003e87–110 octane petrol\u003c\/strong\u003e with a \u003cstrong data-start=\"2185\" data-end=\"2213\"\u003e32:1 fuel-to-oil mixture\u003c\/strong\u003e, the UMS 7-90cc offers reliable starting, smooth throttle transition, and long service life.\u003c\/p\u003e\n\u003cp data-start=\"2308\" data-end=\"2467\"\u003eWhether powering a scale warbird or a detailed classic aircraft, this engine delivers the perfect balance of \u003cstrong data-start=\"2417\" data-end=\"2466\"\u003erealism, performance, and engineering quality\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2 data-start=\"2474\" data-end=\"2493\"\u003e\u003cstrong data-start=\"2477\" data-end=\"2493\"\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2495\" data-end=\"2987\"\u003e\n\u003cli data-start=\"2495\" data-end=\"2539\"\u003e\n\u003cp data-start=\"2497\" data-end=\"2539\"\u003e7-cylinder 4-stroke petrol radial engine\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2540\" data-end=\"2596\"\u003e\n\u003cp data-start=\"2542\" data-end=\"2596\"\u003e90cc displacement – ideal for smaller scale aircraft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2597\" data-end=\"2638\"\u003e\n\u003cp data-start=\"2599\" data-end=\"2638\"\u003eAuthentic radial sound and appearance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2639\" data-end=\"2696\"\u003e\n\u003cp data-start=\"2641\" data-end=\"2696\"\u003eReady-to-run package with ignition and collector ring\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2697\" data-end=\"2750\"\u003e\n\u003cp data-start=\"2699\" data-end=\"2750\"\u003eCNC-machined aluminium and bar stock construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2751\" data-end=\"2805\"\u003e\n\u003cp data-start=\"2753\" data-end=\"2805\"\u003eAircraft-grade alloy cylinder heads and crankcases\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2806\" data-end=\"2850\"\u003e\n\u003cp data-start=\"2808\" data-end=\"2850\"\u003eDouble-bearing crankshaft for durability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2851\" data-end=\"2895\"\u003e\n\u003cp data-start=\"2853\" data-end=\"2895\"\u003eBillet pistons with hardened steel rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2896\" data-end=\"2935\"\u003e\n\u003cp data-start=\"2898\" data-end=\"2935\"\u003eHard-chromed, lapped cylinder bores\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2936\" data-end=\"2987\"\u003e\n\u003cp data-start=\"2938\" data-end=\"2987\"\u003eCompatible with 87–110 octane petrol (32:1 mix)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"2994\" data-end=\"3012\"\u003e\u003cstrong data-start=\"2997\" data-end=\"3012\"\u003ePerfect For\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"3014\" data-end=\"3214\"\u003e\n\u003cli data-start=\"3014\" data-end=\"3043\"\u003e\n\u003cp data-start=\"3016\" data-end=\"3043\"\u003eSmaller scale RC warbirds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3044\" data-end=\"3088\"\u003e\n\u003cp data-start=\"3046\" data-end=\"3088\"\u003eVintage and golden-era aircraft replicas\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3089\" data-end=\"3136\"\u003e\n\u003cp data-start=\"3091\" data-end=\"3136\"\u003eBuilders seeking compact 7-cylinder realism\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3137\" data-end=\"3165\"\u003e\n\u003cp data-start=\"3139\" data-end=\"3165\"\u003eScale competition models\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3166\" data-end=\"3214\"\u003e\n\u003cp data-start=\"3168\" data-end=\"3214\"\u003eAdvanced hobbyists and professional builders\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3221\" data-end=\"3242\"\u003e\u003cstrong data-start=\"3224\" data-end=\"3242\"\u003eSpecifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3244\" data-end=\"3580\"\u003e\u003cstrong data-start=\"3244\" data-end=\"3260\"\u003eEngine Type:\u003c\/strong\u003e 4-Stroke\u003cbr data-start=\"3269\" data-end=\"3272\"\u003e\u003cstrong data-start=\"3272\" data-end=\"3286\"\u003eCylinders:\u003c\/strong\u003e 7 (ABC Type)\u003cbr data-start=\"3299\" data-end=\"3302\"\u003e\u003cstrong data-start=\"3302\" data-end=\"3319\"\u003eDisplacement:\u003c\/strong\u003e 90cc\u003cbr data-start=\"3324\" data-end=\"3327\"\u003e\u003cstrong data-start=\"3327\" data-end=\"3336\"\u003eBore:\u003c\/strong\u003e 25.1mm\u003cbr data-start=\"3343\" data-end=\"3346\"\u003e\u003cstrong data-start=\"3346\" data-end=\"3357\"\u003eStroke:\u003c\/strong\u003e 26.0mm\u003cbr data-start=\"3364\" data-end=\"3367\"\u003e\u003cstrong data-start=\"3367\" data-end=\"3386\"\u003eApprox. Thrust:\u003c\/strong\u003e 9.5kgf @ 24×10 prop\u003cbr data-start=\"3406\" data-end=\"3409\"\u003e\u003cstrong data-start=\"3409\" data-end=\"3423\"\u003eRPM Range:\u003c\/strong\u003e 1,000 – 5,500\u003cbr data-start=\"3437\" data-end=\"3440\"\u003e\u003cstrong data-start=\"3440\" data-end=\"3478\"\u003eWeight (with silencer \u0026amp; ignition):\u003c\/strong\u003e Approx. 3.5kg\u003cbr data-start=\"3492\" data-end=\"3495\"\u003e\u003cstrong data-start=\"3495\" data-end=\"3515\"\u003eEngine Diameter:\u003c\/strong\u003e 230mm\u003cbr data-start=\"3521\" data-end=\"3524\"\u003e\u003cstrong data-start=\"3524\" data-end=\"3542\"\u003eEngine Length:\u003c\/strong\u003e 170mm\u003cbr data-start=\"3548\" data-end=\"3551\"\u003e\u003cstrong data-start=\"3551\" data-end=\"3578\"\u003eRecommended Propellers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"3581\" data-end=\"3752\"\u003e\n\u003cli data-start=\"3581\" data-end=\"3598\"\u003e\n\u003cp data-start=\"3583\" data-end=\"3598\"\u003e2-Blade 26×10\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3599\" data-end=\"3752\"\u003e\n\u003cp data-start=\"3601\" data-end=\"3752\"\u003e2-Blade 24×12\u003cbr data-start=\"3614\" data-end=\"3617\"\u003e\u003cstrong data-start=\"3617\" data-end=\"3634\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3601\" data-end=\"3752\"\u003e\u003cstrong data-start=\"3617\" data-end=\"3634\"\u003eMuffler Type:\u003c\/strong\u003e Collector Ring\u003cbr data-start=\"3649\" data-end=\"3652\"\u003e\u003cstrong data-start=\"3652\" data-end=\"3667\"\u003eSpark Plug:\u003c\/strong\u003e 1\/4-32\u003cbr data-start=\"3674\" data-end=\"3677\"\u003e\u003cstrong data-start=\"3677\" data-end=\"3693\"\u003eCarburettor:\u003c\/strong\u003e Walbro\u003cbr data-start=\"3700\" data-end=\"3703\"\u003e\u003cstrong data-start=\"3703\" data-end=\"3717\"\u003eFuel Type:\u003c\/strong\u003e Petrol (87–110 octane, 32:1 mix)\u003c\/p\u003e\n\u003ch3 data-end=\"3529\" data-start=\"3491\"\u003e\u003cstrong data-end=\"3529\" data-start=\"3495\"\u003eWhy Buy from Probuild Aircraft\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e✅ Official UK stockist – 100% genuine UMS engines\u003cbr data-end=\"3582\" data-start=\"3579\"\u003e✅ Trusted by top international pilots and builders\u003cbr data-end=\"3635\" data-start=\"3632\"\u003e✅ Fast UK shipping and secure packaging\u003cbr data-end=\"3677\" data-start=\"3674\"\u003e✅ Supplying and supporting pilots since 1993\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003eManual:\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e\u003ca rel=\"noopener\" href=\"https:\/\/ch-ignitions.com\/wp-content\/uploads\/2020\/03\/ums-gas-radial-engine-manual-9-115.pdf\" target=\"_blank\"\u003e\u003cimg height=\"351\" width=\"233\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/Screenshot_2026-02-04_115553.png?v=1770206937\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"UMS Engines","offers":[{"title":"Default Title","offer_id":56341649719682,"sku":"UMS7-90","price":1625.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/Gas-Radial-7-90cc.jpg?v=1770811672"},{"product_id":"ums-9-cylinder-115cc-petrol-radial-engine-4-stroke-scale-aircraft-powerplant","title":"UMS 9-Cylinder 115cc Petrol Radial Engine – 4-Stroke Scale Aircraft Powerplant","description":"\u003cp data-start=\"303\" data-end=\"654\"\u003eThe \u003cstrong data-start=\"307\" data-end=\"352\"\u003eUMS 9-Cylinder 115cc Petrol Radial Engine\u003c\/strong\u003e delivers true nine-cylinder radial realism in a compact, precision-engineered 4-stroke package. Designed for scale aircraft builders who demand authentic appearance, smooth operation, and long-term reliability, this ready-to-run petrol radial offers balanced performance and unmistakable radial sound.\u003c\/p\u003e\n\u003ch2 data-start=\"661\" data-end=\"687\"\u003e\u003cstrong data-start=\"664\" data-end=\"687\"\u003eProduct Description\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"689\" data-end=\"961\"\u003eThe \u003cstrong data-start=\"693\" data-end=\"722\"\u003eUMS 9-115cc Radial Engine\u003c\/strong\u003e represents the pinnacle of compact multi-cylinder radial engineering. Featuring a classic \u003cstrong data-start=\"813\" data-end=\"841\"\u003e9-cylinder configuration\u003c\/strong\u003e, it delivers exceptional visual authenticity while providing smooth, well-balanced 4-stroke power across the RPM range.\u003c\/p\u003e\n\u003cp data-start=\"963\" data-end=\"1314\"\u003eWith a \u003cstrong data-start=\"970\" data-end=\"992\"\u003e115cc displacement\u003c\/strong\u003e, this engine is ideal for scale warbirds, vintage aircraft, and museum-quality replica builds where realism and smooth performance are equally important. Supplied \u003cstrong data-start=\"1156\" data-end=\"1172\"\u003eready to run\u003c\/strong\u003e, it includes an exhaust collector ring, electronic ignition system, spark plugs, and a durable engine mount for straightforward installation.\u003c\/p\u003e\n\u003cp data-start=\"1316\" data-end=\"1601\"\u003eManufactured using \u003cstrong data-start=\"1335\" data-end=\"1396\"\u003eprecision CNC-machined aluminium and bar stock components\u003c\/strong\u003e, the engine maintains tight tolerances for consistent performance. The \u003cstrong data-start=\"1468\" data-end=\"1522\"\u003eaircraft-grade alloy cylinder heads and crankcases\u003c\/strong\u003e provide strength while keeping weight optimised for scale flight applications.\u003c\/p\u003e\n\u003cp data-start=\"1603\" data-end=\"1979\"\u003eInternally, a \u003cstrong data-start=\"1617\" data-end=\"1657\"\u003eheavy-duty double-bearing crankshaft\u003c\/strong\u003e enhances stability and longevity under sustained operation. Billet aluminium pistons fitted with hardened steel rings operate within \u003cstrong data-start=\"1791\" data-end=\"1833\"\u003ehard-chromed and lapped cylinder bores\u003c\/strong\u003e, improving wear resistance and combustion efficiency. Hardened steel camshafts ensure accurate valve timing and dependable long-term performance.\u003c\/p\u003e\n\u003cp data-start=\"1981\" data-end=\"2237\"\u003eDesigned to run on \u003cstrong data-start=\"2000\" data-end=\"2024\"\u003e87–110 octane petrol\u003c\/strong\u003e with a \u003cstrong data-start=\"2032\" data-end=\"2060\"\u003e32:1 fuel-to-oil mixture\u003c\/strong\u003e, the UMS 9-115cc radial engine provides dependable starting, smooth throttle response, and authentic radial sound for discerning aviation enthusiasts and professional builders.\u003c\/p\u003e\n\u003ch2 data-start=\"2244\" data-end=\"2263\"\u003e\u003cstrong data-start=\"2247\" data-end=\"2263\"\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2265\" data-end=\"2884\"\u003e\n\u003cli data-start=\"2265\" data-end=\"2334\"\u003e\n\u003cp data-start=\"2267\" data-end=\"2334\"\u003e9-cylinder 4-stroke radial engine with authentic scale appearance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2335\" data-end=\"2391\"\u003e\n\u003cp data-start=\"2337\" data-end=\"2391\"\u003e115cc displacement delivering smooth, balanced power\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2392\" data-end=\"2473\"\u003e\n\u003cp data-start=\"2394\" data-end=\"2473\"\u003eReady-to-run package including ignition, plugs, collector ring \u0026amp; engine mount\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2474\" data-end=\"2537\"\u003e\n\u003cp data-start=\"2476\" data-end=\"2537\"\u003ePrecision CNC-machined aluminium and bar stock construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2538\" data-end=\"2592\"\u003e\n\u003cp data-start=\"2540\" data-end=\"2592\"\u003eAircraft-grade alloy cylinder heads and crankcases\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2593\" data-end=\"2662\"\u003e\n\u003cp data-start=\"2595\" data-end=\"2662\"\u003eHeavy-duty double-bearing crankshaft for durability and stability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2663\" data-end=\"2717\"\u003e\n\u003cp data-start=\"2665\" data-end=\"2717\"\u003eBillet aluminium pistons with hardened steel rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2718\" data-end=\"2777\"\u003e\n\u003cp data-start=\"2720\" data-end=\"2777\"\u003eHard-chromed and lapped cylinder bores for reduced wear\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2778\" data-end=\"2832\"\u003e\n\u003cp data-start=\"2780\" data-end=\"2832\"\u003eHardened steel camshafts for reliable valve timing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2833\" data-end=\"2884\"\u003e\n\u003cp data-start=\"2835\" data-end=\"2884\"\u003eCompatible with 87–110 octane petrol (32:1 mix)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"2891\" data-end=\"2909\"\u003e\u003cstrong data-start=\"2894\" data-end=\"2909\"\u003ePerfect For\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2911\" data-end=\"3133\"\u003e\n\u003cli data-start=\"2911\" data-end=\"2932\"\u003e\n\u003cp data-start=\"2913\" data-end=\"2932\"\u003eScale RC warbirds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2933\" data-end=\"2977\"\u003e\n\u003cp data-start=\"2935\" data-end=\"2977\"\u003eVintage and golden-era aircraft replicas\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2978\" data-end=\"3022\"\u003e\n\u003cp data-start=\"2980\" data-end=\"3022\"\u003eMuseum-quality display and flying models\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3023\" data-end=\"3077\"\u003e\n\u003cp data-start=\"3025\" data-end=\"3077\"\u003eBuilders seeking authentic 9-cylinder radial sound\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3078\" data-end=\"3133\"\u003e\n\u003cp data-start=\"3080\" data-end=\"3133\"\u003eAdvanced hobbyists and professional scale modellers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3140\" data-end=\"3161\"\u003e\u003cstrong data-start=\"3143\" data-end=\"3161\"\u003eSpecifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3163\" data-end=\"3499\"\u003e\u003cstrong data-start=\"3163\" data-end=\"3179\"\u003eEngine Type:\u003c\/strong\u003e 4-Stroke\u003cbr data-start=\"3188\" data-end=\"3191\"\u003e\u003cstrong data-start=\"3191\" data-end=\"3205\"\u003eCylinders:\u003c\/strong\u003e 9 (ABC Type)\u003cbr data-start=\"3218\" data-end=\"3221\"\u003e\u003cstrong data-start=\"3221\" data-end=\"3238\"\u003eDisplacement:\u003c\/strong\u003e 115cc\u003cbr data-start=\"3244\" data-end=\"3247\"\u003e\u003cstrong data-start=\"3247\" data-end=\"3256\"\u003eBore:\u003c\/strong\u003e 25.1mm\u003cbr data-start=\"3263\" data-end=\"3266\"\u003e\u003cstrong data-start=\"3266\" data-end=\"3277\"\u003eStroke:\u003c\/strong\u003e 26.0mm\u003cbr data-start=\"3284\" data-end=\"3287\"\u003e\u003cstrong data-start=\"3287\" data-end=\"3306\"\u003eApprox. Thrust:\u003c\/strong\u003e 12kgf @ 24×12 prop\u003cbr data-start=\"3325\" data-end=\"3328\"\u003e\u003cstrong data-start=\"3328\" data-end=\"3342\"\u003eRPM Range:\u003c\/strong\u003e 1,000 – 5,500\u003cbr data-start=\"3356\" data-end=\"3359\"\u003e\u003cstrong data-start=\"3359\" data-end=\"3397\"\u003eWeight (with silencer \u0026amp; ignition):\u003c\/strong\u003e Approx. 4.6kg\u003cbr data-start=\"3411\" data-end=\"3414\"\u003e\u003cstrong data-start=\"3414\" data-end=\"3434\"\u003eEngine Diameter:\u003c\/strong\u003e 260mm\u003cbr data-start=\"3440\" data-end=\"3443\"\u003e\u003cstrong data-start=\"3443\" data-end=\"3461\"\u003eEngine Length:\u003c\/strong\u003e 170mm\u003cbr data-start=\"3467\" data-end=\"3470\"\u003e\u003cstrong data-start=\"3470\" data-end=\"3497\"\u003eRecommended Propellers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"3500\" data-end=\"3689\"\u003e\n\u003cli data-start=\"3500\" data-end=\"3517\"\u003e\n\u003cp data-start=\"3502\" data-end=\"3517\"\u003e2-Blade 24×10\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3518\" data-end=\"3535\"\u003e\n\u003cp data-start=\"3520\" data-end=\"3535\"\u003e2-Blade 24×12\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3536\" data-end=\"3689\"\u003e\n\u003cp data-start=\"3538\" data-end=\"3689\"\u003e2-Blade 26×10\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3538\" data-end=\"3689\"\u003e\u003cstrong data-start=\"3554\" data-end=\"3571\"\u003eMuffler Type:\u003c\/strong\u003e Collector Ring\u003cbr data-start=\"3586\" data-end=\"3589\"\u003e\u003cstrong data-start=\"3589\" data-end=\"3604\"\u003eSpark Plug:\u003c\/strong\u003e 1\/4-32\u003cbr data-start=\"3611\" data-end=\"3614\"\u003e\u003cstrong data-start=\"3614\" data-end=\"3630\"\u003eCarburettor:\u003c\/strong\u003e Walbro\u003cbr data-start=\"3637\" data-end=\"3640\"\u003e\u003cstrong data-start=\"3640\" data-end=\"3654\"\u003eFuel Type:\u003c\/strong\u003e Petrol (87–110 octane, 32:1 mix)\u003c\/p\u003e\n\u003ch3 data-end=\"3529\" data-start=\"3491\"\u003e\u003cstrong data-end=\"3529\" data-start=\"3495\"\u003eWhy Buy from Probuild Aircraft\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e✅ Official UK stockist – 100% genuine UMS engines\u003cbr data-end=\"3582\" data-start=\"3579\"\u003e✅ Trusted by top international pilots and builders\u003cbr data-end=\"3635\" data-start=\"3632\"\u003e✅ Fast UK shipping and secure packaging\u003cbr data-end=\"3677\" data-start=\"3674\"\u003e✅ Supplying and supporting pilots since 1993\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003eManual:\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e\u003ca rel=\"noopener\" href=\"https:\/\/ch-ignitions.com\/wp-content\/uploads\/2020\/03\/ums-gas-radial-engine-manual-9-115.pdf\" target=\"_blank\"\u003e\u003cimg height=\"351\" width=\"233\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/Screenshot_2026-02-04_115553.png?v=1770206937\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"UMS Engines","offers":[{"title":"Default Title","offer_id":56341917827458,"sku":"UMS9-115","price":1791.67,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/UMS-9-115CC-PETROL.jpg?v=1770810640"},{"product_id":"ums-7-cylinder-50cc-petrol-radial-engine-4-stroke-scale-aircraft-powerplant","title":"UMS 3-Cylinder 100cc Petrol Radial Engine – 4-Stroke Scale Aircraft Powerplant","description":"\u003cp data-start=\"368\" data-end=\"646\"\u003eThe \u003cstrong data-start=\"372\" data-end=\"417\"\u003eUMS 3-Cylinder 100cc Petrol Radial Engine\u003c\/strong\u003e delivers classic radial appearance, distinctive 3-cylinder sound, and dependable 4-stroke performance. Compact yet powerful, it’s ideal for scale warbirds and vintage aircraft requiring authentic aesthetics and smooth operation.\u003c\/p\u003e\n\u003ch2 data-start=\"653\" data-end=\"679\"\u003e\u003cstrong data-start=\"656\" data-end=\"679\"\u003eProduct Description\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"681\" data-end=\"1063\"\u003eThe \u003cstrong data-start=\"685\" data-end=\"714\"\u003eUMS 3-100cc Radial Engine\u003c\/strong\u003e is a precision-built 4-stroke petrol powerplant designed for scale aircraft enthusiasts seeking the perfect blend of realism, performance, and durability. Its traditional \u003cstrong data-start=\"886\" data-end=\"921\"\u003e3-cylinder radial configuration\u003c\/strong\u003e provides an unmistakable vintage appearance and sound, making it ideal for detailed warbirds, golden-era aircraft, and custom scale projects.\u003c\/p\u003e\n\u003cp data-start=\"1065\" data-end=\"1236\"\u003eWith a \u003cstrong data-start=\"1072\" data-end=\"1094\"\u003e100cc displacement\u003c\/strong\u003e, this engine offers strong, reliable power in a manageable size, making it suitable for a wide range of mid-size scale aircraft applications.\u003c\/p\u003e\n\u003cp data-start=\"1238\" data-end=\"1285\"\u003eSupplied \u003cstrong data-start=\"1247\" data-end=\"1263\"\u003eready to run\u003c\/strong\u003e, the engine includes:\u003c\/p\u003e\n\u003cul data-start=\"1287\" data-end=\"1385\"\u003e\n\u003cli data-start=\"1287\" data-end=\"1313\"\u003e\n\u003cp data-start=\"1289\" data-end=\"1313\"\u003eExhaust collector ring\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1314\" data-end=\"1344\"\u003e\n\u003cp data-start=\"1316\" data-end=\"1344\"\u003eElectronic ignition system\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1345\" data-end=\"1360\"\u003e\n\u003cp data-start=\"1347\" data-end=\"1360\"\u003eSpark plugs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1361\" data-end=\"1385\"\u003e\n\u003cp data-start=\"1363\" data-end=\"1385\"\u003eDurable engine mount\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1387\" data-end=\"1546\"\u003eIntegrated \u003cstrong data-start=\"1398\" data-end=\"1431\"\u003echoke and throttle bellcranks\u003c\/strong\u003e simplify installation and ensure smooth throttle response, allowing for straightforward setup and precise control.\u003c\/p\u003e\n\u003cp data-start=\"1548\" data-end=\"1830\"\u003eManufactured using \u003cstrong data-start=\"1567\" data-end=\"1618\"\u003eCNC-machined aluminium and bar stock components\u003c\/strong\u003e, the engine maintains strict tolerances for consistent reliability. The \u003cstrong data-start=\"1691\" data-end=\"1745\"\u003eaircraft-grade alloy cylinder heads and crankcases\u003c\/strong\u003e provide strength while optimising weight distribution for stable flight performance.\u003c\/p\u003e\n\u003cp data-start=\"1832\" data-end=\"1897\"\u003eInternally engineered for long service life, the engine features:\u003c\/p\u003e\n\u003cul data-start=\"1899\" data-end=\"2151\"\u003e\n\u003cli data-start=\"1899\" data-end=\"1969\"\u003e\n\u003cp data-start=\"1901\" data-end=\"1969\"\u003eHeavy-duty double-bearing crankshaft for stable high-RPM operation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1970\" data-end=\"2024\"\u003e\n\u003cp data-start=\"1972\" data-end=\"2024\"\u003eBillet aluminium pistons with hardened steel rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2025\" data-end=\"2084\"\u003e\n\u003cp data-start=\"2027\" data-end=\"2084\"\u003eHard-chromed and lapped cylinder bores for reduced wear\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2085\" data-end=\"2151\"\u003e\n\u003cp data-start=\"2087\" data-end=\"2151\"\u003eHardened steel camshafts for accurate and durable valve timing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2153\" data-end=\"2321\"\u003eDesigned to run on \u003cstrong data-start=\"2172\" data-end=\"2196\"\u003e87–110 octane petrol\u003c\/strong\u003e with a \u003cstrong data-start=\"2204\" data-end=\"2232\"\u003e32:1 fuel-to-oil mixture\u003c\/strong\u003e, the UMS 3-100cc radial offers smooth ignition, strong torque, and dependable operation.\u003c\/p\u003e\n\u003cp data-start=\"2323\" data-end=\"2500\"\u003eWhether you're building a detailed warbird replica or a custom radial-powered project, this engine delivers \u003cstrong data-start=\"2431\" data-end=\"2499\"\u003eauthentic character, refined engineering, and proven reliability\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2 data-start=\"2507\" data-end=\"2526\"\u003e\u003cstrong data-start=\"2510\" data-end=\"2526\"\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2528\" data-end=\"3003\"\u003e\n\u003cli data-start=\"2528\" data-end=\"2572\"\u003e\n\u003cp data-start=\"2530\" data-end=\"2572\"\u003e3-cylinder 4-stroke petrol radial engine\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2573\" data-end=\"2595\"\u003e\n\u003cp data-start=\"2575\" data-end=\"2595\"\u003e100cc displacement\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2596\" data-end=\"2649\"\u003e\n\u003cp data-start=\"2598\" data-end=\"2649\"\u003eAuthentic radial appearance and distinctive sound\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2650\" data-end=\"2706\"\u003e\n\u003cp data-start=\"2652\" data-end=\"2706\"\u003eReady-to-run with ignition, plugs and collector ring\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2707\" data-end=\"2760\"\u003e\n\u003cp data-start=\"2709\" data-end=\"2760\"\u003eCNC-machined aluminium and bar stock construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2761\" data-end=\"2806\"\u003e\n\u003cp data-start=\"2763\" data-end=\"2806\"\u003eAircraft-grade alloy heads and crankcases\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2807\" data-end=\"2851\"\u003e\n\u003cp data-start=\"2809\" data-end=\"2851\"\u003eDouble-bearing crankshaft for durability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2852\" data-end=\"2896\"\u003e\n\u003cp data-start=\"2854\" data-end=\"2896\"\u003eBillet pistons with hardened steel rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2897\" data-end=\"2951\"\u003e\n\u003cp data-start=\"2899\" data-end=\"2951\"\u003eHard-chromed cylinder bores for enhanced longevity\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2952\" data-end=\"3003\"\u003e\n\u003cp data-start=\"2954\" data-end=\"3003\"\u003eCompatible with 87–110 octane petrol (32:1 mix)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3010\" data-end=\"3028\"\u003e\u003cstrong data-start=\"3013\" data-end=\"3028\"\u003ePerfect For\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"3030\" data-end=\"3212\"\u003e\n\u003cli data-start=\"3030\" data-end=\"3051\"\u003e\n\u003cp data-start=\"3032\" data-end=\"3051\"\u003eScale RC warbirds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3052\" data-end=\"3096\"\u003e\n\u003cp data-start=\"3054\" data-end=\"3096\"\u003eGolden-era and vintage aircraft replicas\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3097\" data-end=\"3129\"\u003e\n\u003cp data-start=\"3099\" data-end=\"3129\"\u003eCustom radial-powered builds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3130\" data-end=\"3160\"\u003e\n\u003cp data-start=\"3132\" data-end=\"3160\"\u003eCompetition scale aircraft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3161\" data-end=\"3212\"\u003e\n\u003cp data-start=\"3163\" data-end=\"3212\"\u003eExperienced hobbyists and professional builders\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3219\" data-end=\"3240\"\u003e\u003cstrong data-start=\"3222\" data-end=\"3240\"\u003eSpecifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3242\" data-end=\"3563\"\u003e\u003cstrong data-start=\"3242\" data-end=\"3258\"\u003eEngine Type:\u003c\/strong\u003e 4-Stroke\u003cbr data-start=\"3267\" data-end=\"3270\"\u003e\u003cstrong data-start=\"3270\" data-end=\"3284\"\u003eCylinders:\u003c\/strong\u003e 3 (ABC Type)\u003cbr data-start=\"3297\" data-end=\"3300\"\u003e\u003cstrong data-start=\"3300\" data-end=\"3317\"\u003eDisplacement:\u003c\/strong\u003e 100cc\u003cbr data-start=\"3323\" data-end=\"3326\"\u003e\u003cstrong data-start=\"3326\" data-end=\"3335\"\u003eBore:\u003c\/strong\u003e 37mm\u003cbr data-start=\"3340\" data-end=\"3343\"\u003e\u003cstrong data-start=\"3343\" data-end=\"3354\"\u003eStroke:\u003c\/strong\u003e 32mm\u003cbr data-start=\"3359\" data-end=\"3362\"\u003e\u003cstrong data-start=\"3362\" data-end=\"3381\"\u003eApprox. Thrust:\u003c\/strong\u003e 13.5kgf\u003cbr data-start=\"3389\" data-end=\"3392\"\u003e\u003cstrong data-start=\"3392\" data-end=\"3406\"\u003eRPM Range:\u003c\/strong\u003e 1,000 – 5,500\u003cbr data-start=\"3420\" data-end=\"3423\"\u003e\u003cstrong data-start=\"3423\" data-end=\"3461\"\u003eWeight (with silencer \u0026amp; ignition):\u003c\/strong\u003e Approx. 3.8kg\u003cbr data-start=\"3475\" data-end=\"3478\"\u003e\u003cstrong data-start=\"3478\" data-end=\"3498\"\u003eEngine Diameter:\u003c\/strong\u003e 255mm\u003cbr data-start=\"3504\" data-end=\"3507\"\u003e\u003cstrong data-start=\"3507\" data-end=\"3525\"\u003eEngine Length:\u003c\/strong\u003e 185mm\u003cbr data-start=\"3531\" data-end=\"3534\"\u003e\u003cstrong data-start=\"3534\" data-end=\"3561\"\u003eRecommended Propellers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"3564\" data-end=\"3732\"\u003e\n\u003cli data-start=\"3564\" data-end=\"3581\"\u003e\n\u003cp data-start=\"3566\" data-end=\"3581\"\u003e2-Blade 24×10\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3582\" data-end=\"3732\"\u003e\n\u003cp data-start=\"3584\" data-end=\"3732\"\u003e2-Blade 28×8\u003cbr data-start=\"3596\" data-end=\"3599\"\u003e\u003cstrong data-start=\"3599\" data-end=\"3616\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3584\" data-end=\"3732\"\u003e\u003cstrong data-start=\"3599\" data-end=\"3616\"\u003eMuffler Type:\u003c\/strong\u003e Collector Ring\u003cbr data-start=\"3631\" data-end=\"3634\"\u003e\u003cstrong data-start=\"3634\" data-end=\"3649\"\u003eSpark Plug:\u003c\/strong\u003e CM-6\u003cbr data-start=\"3654\" data-end=\"3657\"\u003e\u003cstrong data-start=\"3657\" data-end=\"3673\"\u003eCarburettor:\u003c\/strong\u003e Walbro\u003cbr data-start=\"3680\" data-end=\"3683\"\u003e\u003cstrong data-start=\"3683\" data-end=\"3697\"\u003eFuel Type:\u003c\/strong\u003e Petrol (87–110 octane, 32:1 mix)\u003c\/p\u003e\n\u003ch3 data-end=\"3529\" data-start=\"3491\"\u003e\u003cstrong data-end=\"3529\" data-start=\"3495\"\u003eWhy Buy from Probuild Aircraft\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e✅ Official UK stockist – 100% genuine UMS engines\u003cbr data-end=\"3582\" data-start=\"3579\"\u003e✅ Trusted by top international pilots and builders\u003cbr data-end=\"3635\" data-start=\"3632\"\u003e✅ Fast UK shipping and secure packaging\u003cbr data-end=\"3677\" data-start=\"3674\"\u003e✅ Supplying and supporting pilots since 1993\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003eManual:\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e\u003ca rel=\"noopener\" href=\"https:\/\/ch-ignitions.com\/wp-content\/uploads\/2020\/03\/ums-gas-radial-engine-manual-9-115.pdf\" target=\"_blank\"\u003e\u003cimg height=\"351\" width=\"233\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/Screenshot_2026-02-04_115553.png?v=1770206937\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"UMS Engines","offers":[{"title":"Default Title","offer_id":56342084256130,"sku":"UMS3-100","price":1208.33,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/UMS-3-100CC-PETROL.jpg?v=1770812647"},{"product_id":"ums-2-cylinder-140cc-petrol-radial-engine-4-stroke-scale-aircraft-powerplant","title":"UMS 2-Cylinder 140cc Petrol Twin Boxer Engine – 4-Stroke Scale Aircraft Powerplant","description":"\u003cp data-start=\"312\" data-end=\"616\"\u003eThe \u003cstrong data-start=\"316\" data-end=\"365\"\u003eUMS 2-Cylinder 140cc Petrol Twin Boxer Engine\u003c\/strong\u003e delivers smooth, low-vibration 4-stroke performance in a powerful horizontally opposed configuration. Precision CNC-machined from aircraft-grade materials, this 140cc twin is built for reliability, efficiency, and serious scale aircraft applications.\u003c\/p\u003e\n\u003ch2 data-start=\"623\" data-end=\"649\"\u003e\u003cstrong data-start=\"626\" data-end=\"649\"\u003eProduct Description\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"651\" data-end=\"1032\"\u003eThe \u003cstrong data-start=\"655\" data-end=\"688\"\u003eUMS 2-140cc Twin Boxer Engine\u003c\/strong\u003e is a high-performance 4-stroke petrol powerplant designed for demanding scale aircraft and large RC model applications. Featuring a \u003cstrong data-start=\"821\" data-end=\"873\"\u003ehorizontally opposed twin-cylinder configuration\u003c\/strong\u003e, this engine offers excellent natural balance, resulting in reduced vibration, smoother throttle response, and consistent power delivery across the RPM range.\u003c\/p\u003e\n\u003cp data-start=\"1034\" data-end=\"1207\"\u003eWith a \u003cstrong data-start=\"1041\" data-end=\"1063\"\u003e140cc displacement\u003c\/strong\u003e, it produces strong torque and dependable thrust, making it ideal for large-scale warbirds, aerobatic aircraft, and performance-focused builds.\u003c\/p\u003e\n\u003cp data-start=\"1209\" data-end=\"1529\"\u003eEngineered with precision, the cylinder heads and crankcases are manufactured from \u003cstrong data-start=\"1292\" data-end=\"1327\"\u003eaircraft-grade aluminium alloys\u003c\/strong\u003e, providing exceptional structural strength while maintaining optimal weight. All major components are \u003cstrong data-start=\"1430\" data-end=\"1475\"\u003eCNC-machined from aluminium and bar stock\u003c\/strong\u003e, ensuring tight tolerances and long-term reliability.\u003c\/p\u003e\n\u003cp data-start=\"1531\" data-end=\"1593\"\u003eInternally, the engine is built for durability and efficiency:\u003c\/p\u003e\n\u003cul data-start=\"1595\" data-end=\"1922\"\u003e\n\u003cli data-start=\"1595\" data-end=\"1671\"\u003e\n\u003cp data-start=\"1597\" data-end=\"1671\"\u003e\u003cstrong data-start=\"1597\" data-end=\"1625\"\u003eBillet aluminium pistons\u003c\/strong\u003e for strength and reduced reciprocating mass\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1672\" data-end=\"1742\"\u003e\n\u003cp data-start=\"1674\" data-end=\"1742\"\u003e\u003cstrong data-start=\"1674\" data-end=\"1705\"\u003eHardened steel piston rings\u003c\/strong\u003e for improved sealing and longevity\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1743\" data-end=\"1849\"\u003e\n\u003cp data-start=\"1745\" data-end=\"1849\"\u003e\u003cstrong data-start=\"1745\" data-end=\"1797\"\u003eHard-chromed and precision-lapped cylinder bores\u003c\/strong\u003e for reduced friction and enhanced wear resistance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1850\" data-end=\"1922\"\u003e\n\u003cp data-start=\"1852\" data-end=\"1922\"\u003e\u003cstrong data-start=\"1852\" data-end=\"1880\"\u003eHardened steel camshafts\u003c\/strong\u003e for accurate, long-lasting valve timing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1924\" data-end=\"2071\"\u003eThe engine operates via \u003cstrong data-start=\"1948\" data-end=\"1966\"\u003espark ignition\u003c\/strong\u003e and includes a \u003cstrong data-start=\"1982\" data-end=\"2019\"\u003efront-side magnet ignition system\u003c\/strong\u003e for dependable starting and consistent performance.\u003c\/p\u003e\n\u003cp data-start=\"2073\" data-end=\"2260\"\u003eCompatible with \u003cstrong data-start=\"2089\" data-end=\"2104\"\u003epetrol fuel\u003c\/strong\u003e, the UMS 2-140cc delivers smooth running from idle through to peak RPM, making it a trusted choice for serious enthusiasts and professional builders alike.\u003c\/p\u003e\n\u003ch2 data-start=\"2267\" data-end=\"2286\"\u003e\u003cstrong data-start=\"2270\" data-end=\"2286\"\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2288\" data-end=\"2795\"\u003e\n\u003cli data-start=\"2288\" data-end=\"2347\"\u003e\n\u003cp data-start=\"2290\" data-end=\"2347\"\u003e2-cylinder horizontally opposed (boxer) 4-stroke engine\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2348\" data-end=\"2396\"\u003e\n\u003cp data-start=\"2350\" data-end=\"2396\"\u003e140cc displacement with strong torque output\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2397\" data-end=\"2455\"\u003e\n\u003cp data-start=\"2399\" data-end=\"2455\"\u003eNaturally balanced configuration for reduced vibration\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2456\" data-end=\"2507\"\u003e\n\u003cp data-start=\"2458\" data-end=\"2507\"\u003eCNC-machined aluminium and bar stock components\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2508\" data-end=\"2553\"\u003e\n\u003cp data-start=\"2510\" data-end=\"2553\"\u003eAircraft-grade alloy heads and crankcases\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2554\" data-end=\"2598\"\u003e\n\u003cp data-start=\"2556\" data-end=\"2598\"\u003eBillet pistons with hardened steel rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2599\" data-end=\"2641\"\u003e\n\u003cp data-start=\"2601\" data-end=\"2641\"\u003eHard-chromed and lapped cylinder bores\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2642\" data-end=\"2691\"\u003e\n\u003cp data-start=\"2644\" data-end=\"2691\"\u003eHardened steel cams for long-term reliability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2692\" data-end=\"2740\"\u003e\n\u003cp data-start=\"2694\" data-end=\"2740\"\u003eSpark ignition with front-side magnet system\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2741\" data-end=\"2795\"\u003e\n\u003cp data-start=\"2743\" data-end=\"2795\"\u003eDesigned for demanding scale and large RC aircraft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"2802\" data-end=\"2820\"\u003e\u003cstrong data-start=\"2805\" data-end=\"2820\"\u003ePerfect For\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2822\" data-end=\"3003\"\u003e\n\u003cli data-start=\"2822\" data-end=\"2849\"\u003e\n\u003cp data-start=\"2824\" data-end=\"2849\"\u003eLarge-scale RC warbirds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2850\" data-end=\"2879\"\u003e\n\u003cp data-start=\"2852\" data-end=\"2879\"\u003eAerobatic aircraft models\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2880\" data-end=\"2908\"\u003e\n\u003cp data-start=\"2882\" data-end=\"2908\"\u003eScale competition builds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2909\" data-end=\"2951\"\u003e\n\u003cp data-start=\"2911\" data-end=\"2951\"\u003eTwin-cylinder full-size style replicas\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2952\" data-end=\"3003\"\u003e\n\u003cp data-start=\"2954\" data-end=\"3003\"\u003eExperienced hobbyists and professional builders\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3010\" data-end=\"3031\"\u003e\u003cstrong data-start=\"3013\" data-end=\"3031\"\u003eSpecifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3033\" data-end=\"3409\"\u003e\u003cstrong data-start=\"3033\" data-end=\"3049\"\u003eEngine Type:\u003c\/strong\u003e 4-Stroke Spark Ignition\u003cbr data-start=\"3073\" data-end=\"3076\"\u003e\u003cstrong data-start=\"3076\" data-end=\"3094\"\u003eConfiguration:\u003c\/strong\u003e Two-Cylinder Boxer (Horizontally Opposed)\u003cbr data-start=\"3136\" data-end=\"3139\"\u003e\u003cstrong data-start=\"3139\" data-end=\"3156\"\u003eDisplacement:\u003c\/strong\u003e 140cc\u003cbr data-start=\"3162\" data-end=\"3165\"\u003e\u003cstrong data-start=\"3165\" data-end=\"3174\"\u003eBore:\u003c\/strong\u003e 50mm\u003cbr data-start=\"3179\" data-end=\"3182\"\u003e\u003cstrong data-start=\"3182\" data-end=\"3193\"\u003eStroke:\u003c\/strong\u003e 37mm\u003cbr data-start=\"3198\" data-end=\"3201\"\u003e\u003cstrong data-start=\"3201\" data-end=\"3220\"\u003eApprox. Thrust:\u003c\/strong\u003e 16kgf\u003cbr data-start=\"3226\" data-end=\"3229\"\u003e\u003cstrong data-start=\"3229\" data-end=\"3243\"\u003eRPM Range:\u003c\/strong\u003e 1,000 – 6,000\u003cbr data-start=\"3257\" data-end=\"3260\"\u003e\u003cstrong data-start=\"3260\" data-end=\"3298\"\u003eWeight (with silencer \u0026amp; ignition):\u003c\/strong\u003e Approx. 4.95kg\u003cbr data-start=\"3313\" data-end=\"3316\"\u003e\u003cstrong data-start=\"3316\" data-end=\"3340\"\u003eHead-to-Head Length:\u003c\/strong\u003e 293.6mm\u003cbr data-start=\"3348\" data-end=\"3351\"\u003e\u003cstrong data-start=\"3351\" data-end=\"3369\"\u003eEngine Length:\u003c\/strong\u003e 230.5mm\u003cbr data-start=\"3377\" data-end=\"3380\"\u003e\u003cstrong data-start=\"3380\" data-end=\"3407\"\u003eRecommended Propellers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"3410\" data-end=\"3536\"\u003e\n\u003cli data-start=\"3410\" data-end=\"3419\"\u003e\n\u003cp data-start=\"3412\" data-end=\"3419\"\u003e28×10\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3420\" data-end=\"3536\"\u003e\n\u003cp data-start=\"3422\" data-end=\"3536\"\u003e30×10\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3422\" data-end=\"3536\"\u003e\u003cstrong data-start=\"3430\" data-end=\"3443\"\u003eIgnition:\u003c\/strong\u003e Front Side Magnet\u003cbr data-start=\"3461\" data-end=\"3464\"\u003e\u003cstrong data-start=\"3464\" data-end=\"3479\"\u003eSpark Plug:\u003c\/strong\u003e CM-6\u003cbr data-start=\"3484\" data-end=\"3487\"\u003e\u003cstrong data-start=\"3487\" data-end=\"3503\"\u003eCarburettor:\u003c\/strong\u003e Walbro\u003cbr data-start=\"3510\" data-end=\"3513\"\u003e\u003cstrong data-start=\"3513\" data-end=\"3527\"\u003eFuel Type:\u003c\/strong\u003e Petrol\u003c\/p\u003e\n\u003ch3 data-end=\"3529\" data-start=\"3491\"\u003e\u003cstrong data-end=\"3529\" data-start=\"3495\"\u003eWhy Buy from Probuild Aircraft\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e✅ Official UK stockist – 100% genuine UMS engines\u003cbr data-end=\"3582\" data-start=\"3579\"\u003e✅ Trusted by top international pilots and builders\u003cbr data-end=\"3635\" data-start=\"3632\"\u003e✅ Fast UK shipping and secure packaging\u003cbr data-end=\"3677\" data-start=\"3674\"\u003e✅ Supplying and supporting pilots since 1993\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003eManual:\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e\u003ca rel=\"noopener\" href=\"https:\/\/ch-ignitions.com\/wp-content\/uploads\/2020\/03\/ums-gas-radial-engine-manual-9-115.pdf\" target=\"_blank\"\u003e\u003cimg height=\"351\" width=\"233\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/Screenshot_2026-02-04_115553.png?v=1770206937\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"UMS Engines","offers":[{"title":"Default Title","offer_id":56342199239042,"sku":"UMS2-140","price":1708.33,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/UMS-2-140CC-PETROL.jpg?v=1770813209"},{"product_id":"ums-2-cylinder-200cc-petrol-twin-boxer-engine-4-stroke-scale-aircraft-powerplant-copy","title":"UMS 2-Cylinder 200cc Petrol Twin Boxer Engine – 4-Stroke Scale Aircraft Powerplant","description":"\u003cp\u003eThe UMS 2-Cylinder 200cc Petrol Twin Boxer Engine delivers exceptional torque, smooth 4-stroke performance, and reduced vibration thanks to its horizontally opposed configuration. Precision CNC-machined and built from aircraft-grade materials, this 200cc powerhouse is designed for serious large-scale aircraft applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Description\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe UMS 2-200cc Twin Boxer Engine is a high-output 4-stroke petrol engine engineered for demanding scale aircraft and professional RC builds. Featuring a horizontally opposed twin-cylinder (boxer) layout, the engine benefits from natural balance, reducing vibration while delivering smooth, consistent power throughout the RPM range.\u003c\/p\u003e\n\u003cp\u003eWith an impressive 200cc displacement and approximately 25kgf of thrust, this engine is ideally suited to large-scale warbirds, aerobatic aircraft, and heavy RC platforms requiring strong torque and dependable performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePremium Construction Engineering\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDurability begins with aircraft-grade alloy cylinder heads and crankcases, providing superior strength and thermal stability under high-load conditions. All major components are CNC-machined from aluminium and bar stock, ensuring tight tolerances and long-term reliability.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInternally, the engine features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBillet aluminium pistons for optimal strength-to-weight ratio\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHardened steel piston rings for improved sealing and wear resistance\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHard-chromed and precision-lapped cylinder bores for reduced friction and enhanced longevity\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHardened steel camshafts for accurate valve timing and durability under sustained load\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eThe precision-lapped bores promote consistent compression and efficient combustion, while chrome plating enhances corrosion resistance and service life.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSmooth Power Delivery\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe boxer configuration minimises vibration, protecting airframes and onboard electronics while improving throttle response. The spark ignition system with front-side magnet ensures dependable starting and reliable performance across the operating range.\u003c\/p\u003e\n\u003cp\u003eDesigned to run on petrol fuel, this engine provides smooth idle characteristics and strong mid-to-high RPM power, making it a trusted solution for experienced builders and professional pilots alike.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2-cylinder horizontally opposed (boxer) 4-stroke engine\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e200cc displacement delivering approx. 25kgf thrust\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eNaturally balanced design for reduced vibration\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCNC-machined aluminium and bar stock construction\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAircraft-grade alloy heads and crankcases\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBillet pistons with hardened steel rings\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHard-chromed and lapped cylinder bores\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHardened steel camshafts for long-term reliability\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFront-side magnet spark ignition system\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDesigned for large-scale and high-performance aircraft\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePerfect For\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLarge-scale RC warbirds\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAerobatic aircraft models\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHeavy-scale competition builds\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eProfessional and advanced hobby applications\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAircraft requiring strong torque and smooth 4-stroke power\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEngine Type: 4-Stroke Spark Ignition\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eConfiguration: Two-Cylinder Boxer (Horizontally Opposed)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDisplacement: 200cc\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBore: 52mm\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eStroke: 48mm\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eApprox. Thrust: 25kgf\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eRPM Range: 1,000 – 5,000\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWeight (with silencer \u0026amp;amp; ignition): Approx. 6.0kg\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHead-to-Head Length: 352mm\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eEngine Length: 228.5mm\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eRecommended Propellers:\u003cbr\u003e\n\u003cul\u003e\n\u003cli\u003e32×14\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e33×14\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eIgnition: Front-Side Magnet\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSpark Plug: CM-6\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCarburettor: Walbro\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFuel Type: Petrol\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eWhy Buy from Probuild Aircraft\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e✅ Official UK stockist – 100% genuine UMS engines\u003cbr\u003e✅ Trusted by top international pilots and builders\u003cbr\u003e✅ Fast UK shipping and secure packaging\u003cbr\u003e✅ Supplying and supporting pilots since 1993\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003eManual:\u003c\/p\u003e\n\u003cp data-end=\"3723\" data-start=\"3530\"\u003e\u003ca rel=\"noopener\" href=\"https:\/\/ch-ignitions.com\/wp-content\/uploads\/2020\/03\/ums-gas-radial-engine-manual-9-115.pdf\" target=\"_blank\"\u003e\u003cimg height=\"351\" width=\"233\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/Screenshot_2026-02-04_115553.png?v=1770206937\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"UMS Engines","offers":[{"title":"Default Title","offer_id":56342234136962,"sku":"UMS2-200","price":1915.83,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/files\/UMS-2-200CC-PETROL.jpg?v=1770813584"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/7711\/0146\/collections\/UMS-ENGINES.jpg?v=1770205849","url":"https:\/\/www.probuild-uk.co.uk\/collections\/ums-petrol-radial-twin-engines.oembed","provider":"Probuild Aircraft Ltd","version":"1.0","type":"link"}