Os Engine Speed 91Hz-R 3D (L-Os18642)

Following 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!

The 3C version is designed expressly for F3C competition with its controlled, precise manoeuvres in mind. For pilots who prefer aggressive, stick-bashing 3D flight competition, O.S. offers a 3D version.

Features:

Lightweight, machined heat sink head
Big-bore carburettors best-suited for the intended use (F3C or 3D)
Best precision advanced exhaust cylinder timing (for F3C or 3D)
Newly designed combustion chambers, shaped to match the big bore carburettors and advanced exhaust cylinder timing
Lightweight, forged steel crankshaft counter weight to lower vibration for higher speeds
Improved back plate shape, to accommodate Futaba's BPS-1 RPM Sensor and increase primary pressure for greater stability
The cover plate has a cell to accept a sensor designed to install in the cover plate from Futaba GY701 / CGY750 Governor

91HZ-R 3D Speed Black
Pilots who slam the sticks will be very impressed with the 3D version. This engine develops all the high performance required for stable horsepower at any attitude. The big bore carburettor (11.2mm) is specially designed to develop stable horsepower at 70~80% throttle which is widely used in 3D flight. The matched cylinder exhaust timing has been advanced to 165 degrees.

Package Included:
Engine Pack O.S. Speed Tuned .91HZ-R Helicopter Engine with Pump, 61G Carb
NO 8 Glow Plug
Check Valve
Head Gasket 0.2mm
OS Speed Decal and English Instruction manual

SPECIFICATIONS:
Displacement: 0.91 cu in (14.9 cc)
Bore: 1.09 in (27.7 mm)
Stroke: 0.98 in (24.8 mm)
Output: 3.6 hp @ 15500 rpm
Practical RPM Range: 2,000-16,500
Weight (w/o Muffler): 21.2 oz (603 g)