{"product_id":"o-s-speed-91hz-r-3d-helicopter-engine","title":"O.S.Speed 91HZ-R 3D Helicopter Engine","description":"\u003cp\u003eFollowing the popularity of the 91HZ-R with On-Demand Regulator, O.S. has now taken high-performance, high-speed helicopter engines to the next stage of evolution. Introducing the 91HZ-R Speed Engines - based on the 91HZ-R, factory-tuned at the O.S.\/Japan facilities and guaranteed to blow you away!\u003c\/p\u003e\n\u003ch3\u003e\n\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLightweight, machined heat sink head\u003c\/li\u003e\n\u003cli\u003eBig-bore carburettors best-suited for the intended use (F3C or 3D)\u003c\/li\u003e\n\u003cli\u003eBest precision advanced exhaust cylinder timing (for F3C or 3D)\u003c\/li\u003e\n\u003cli\u003eNewly designed combustion chambers, shaped to match the big bore carburettors and advanced exhaust cylinder timing\u003c\/li\u003e\n\u003cli\u003eLightweight, forged steel crankshaft counter weight to lower vibration for higher speeds\u003c\/li\u003e\n\u003cli\u003eImproved back plate shape, to accommodate Futaba's BPS-1 RPM Sensor and increase primary pressure for greater stability\u003c\/li\u003e\n\u003cli\u003eThe cover plate has a cell to accept a sensor designed to install in the cover plate from Futaba GY701 \/ CGY750 Governor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\n\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDisplacement: 14.95cc\u003c\/li\u003e\n\u003cli\u003eBore: 27.7mm\u003c\/li\u003e\n\u003cli\u003eStroke: 24.8mm\u003c\/li\u003e\n\u003cli\u003eOutput: 3.6ps\/15,500RPM\u003c\/li\u003e\n\u003cli\u003ePractical RPM Range: 2,000-16,500\u003c\/li\u003e\n\u003cli\u003eWeight: 603g\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003ePackage Included:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEngine Pack O.S. Speed Tuned .91HZ-R Helicopter Engine with Pump, 61G Carb\u003c\/li\u003e\n\u003cli\u003e#8 Glow Plug\u003c\/li\u003e\n\u003cli\u003eCheck Valve\u003c\/li\u003e\n\u003cli\u003eHead Gasket 0.2mm\u003c\/li\u003e\n\u003cli\u003eOS Speed Decal and English Instruction Manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePipe: O.S. \u003ca href=\"https:\/\/www.helidirect.com\/products\/o-s-engine-powerboost-pipe-105hz\" title=\"O.S. Powerboost Pipe 105HZ\"\u003ePowerboost Pipe 105\u003c\/a\u003e\u003c\/p\u003e","brand":"OS Engines","offers":[{"title":"Default Title","offer_id":42310585843772,"sku":"OS-18642","price":449.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0640\/7333\/4844\/files\/O-SEngine1.jpg?v=1730702271","url":"https:\/\/helidirect-demo-mode.myshopify.com\/products\/o-s-speed-91hz-r-3d-helicopter-engine","provider":"HeliDirect Demo Mode","version":"1.0","type":"link"}