{"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":2499.0,"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","url":"https:\/\/www.probuild-uk.co.uk\/products\/ums-5-cylinder-150cc-petrol-radial-engine-4-stroke-scale-aircraft-powerplant","provider":"Probuild Aircraft Ltd","version":"1.0","type":"link"}