{"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":2775.0,"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","url":"https:\/\/www.probuild-uk.co.uk\/products\/ums-5-cylinder-210cc-petrol-radial-engine-4-stroke-scale-aircraft-powerplant-copy","provider":"Probuild Aircraft Ltd","version":"1.0","type":"link"}