Responding to the ultimate pilot's request for intense 3D flight with instantly changing power and torque, the O.S. SPEED 91HZ-R 3D was created to generate desired power across the entire range.
The specially designed engine head features a combustion chamber shape optimized for 30% nitro fuel, commonly used in 3D flight, and boasts excellent heat dissipation with its machined finish. Combined with the same colored body, it presents a cool appearance with a full black anodized finish.
The carburetor bore has also been enlarged to an appropriate size for 3D flight power, and the cylinder's exhaust port shape has been modified to an optimized design, taking output characteristics into consideration. Furthermore, while retaining the DRS for stable fuel supply unaffected by extreme attitude changes, the crankshaft has been redesigned with a revised balancer shape to further enhance stability during high-altitude flight.
Specifications:
Displacement: 14.95 cc
Bore: 27.7mm
Stroke: 24.8mm
Power: 3.6ps/16,000 r.p.m.
Practical Speed Range: 2,000～16,000 r.p.m.
Weight: 603g (engine only)
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