O.S.Speed 91HZ-R 3D Helicopter Engine

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!

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

Technical Specifications

• Displacement: 14.95cc
• Bore: 27.7mm
• Stroke: 24.8mm
• Output: 3.6ps/15,500RPM
• Practical RPM Range: 2,000-16,500
• Weight: 603g

Package Included:

• Engine Pack O.S. Speed Tuned .91HZ-R Helicopter Engine with Pump, 61G Carb
• #8 Glow Plug
• Check Valve
• Head Gasket 0.2mm
• OS Speed Decal and English Instruction Manual

Pipe: O.S. Powerboost Pipe 105