O.S SPEED 91HZ-R 3D 14.95cc 2-Stroke Heli Engine

O.S.Engine 18642 - O.S.SPEED 91HZ-R 3D Helicopter Engine

Desired by many enthusiastic 3D pilots, we would like to introduce you the re-releasing of ever popular O.S.SPEED 91HZ-R 3D.

We have decided to resell the 700 class GP helicopter engine O.S.SPEED 91HZ-R 3D, produced by O.S.SPEED, which produces the world's best engines in the car racing sector!

In recent years, the NITRO model has regained popularity in the overseas 3D scene in search of powerful exhaust smoke and engine sounds that touch the five senses, and new models are appearing one after another from overseas 3D helicopter manufacturers. We have received many requests to resell the O.S.SPEED 91HZ-R3D in order to provide a satisfactory power supply for 3D flights, which are becoming more and more extreme due to improved performance of helicopters. This model has been tuned to match the output characteristics of 3D flight, including improvements to the engine head structure and exhaust port structure, as well as crankshaft balancing and a review of the cover plate shape.

• This engine is designed especially for 3D flights.
• O.S.SPEED 91HZ-R 3D has less vibration compare to 105HZ-R and has better fuel consumption for longer flight.
• To ensure stable power and torque, the crankshaft has also been specially designed for 91HZ-R 3D.
• Shape of the balancer has also been changed in order to reduce vibrations, especially at high speeds.

Carburettor
In order to generate output that matches the 3D flight characteristics, the carburetor diameter is set to match the 3D flight characteristics. It is specially designed for this engine. Equipped as standard with a pressurizing regulator DRS that always supplies the ideal air-fuel mixture for the aircraft movements requested by the pilot.


Cooling Head
The shape of the engine head has also been specially designed to match the power characteristics required by the 3D flyer. It is a special specification with laser marking of the O.S.SPEED brand logo on the jet black head.


Piston & Liner
The exhaust port shape inside the cylinder has been redesigned to match the 3D's normal rotation range. We are aiming for a torqueful output characteristic that is not easily affected by the radical changes in attitude of a 3D helicopter.


Rear Cover
The cover plate part is equipped with a mounting hole that allows the Futaba Electronics Governor Sensor BPS-1 to be built in.


Crankshaft
To ensure stable power and torque, the crankshaft has also been specially designed as an O.S.SPEED version. The shape of the balancer has been changed to reduce vibrations at high speeds.


Feel with your eyes, ears, and fingertips the powerful power and response difference of the O.S.SPEED 91HZ-R 3D engine, which was born with the best of O.S.Engine technology.


Boost Pipe Compatible
Power boost pipe 105 is compatible with O.S.SPEED 91HZ-R 3D. Demonstrates excellent output characteristics in the rotation range required for 3D flight. In addition, it always demonstrates stable performance even in hovering and idling ranges, making engine adjustments easy.

Specs: