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OS O.S. Speed 91HZ-R 3C
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O.S. Speed 91HZ-R 3C - L-OS18641
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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 agressive, stick-bashing 3D flight competition, O.S. offers a 3D version.

Achieve faster flight speeds and improved hovering stability.

Features Include
• Lightweight, machined heatsink 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 combusion chambers, shaped to match the big bore carburettors and advanced exhaust cylinder timing.
• Lightweight, forget steel crankshaft counter weight to lower vibration for higher speeds
• Improved backplate shape to accomodate Futaba's BPS-1 RPM Sensor and increase primary pressure for greater stability.
Power Output:3.6hp @ 15,500rpm
Practical RPM:2,000 - 16,500rpm
Weight:603g (w/o muffler)

Part No: L-OS18641
Item Name: O.S. Speed 91HZ-R 3C
Brand: OS

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