OS Speed 91HZ-R 3D Engine: 18642

Features:

The O.S. SPEED 91HZ-R 3D engine is back on the market to provide satisfactory power for 3D flight, which is becoming more and more extreme due to the improvement of helicopter performance.

Based on the MAX-91HZ-R engine for the 91 helicopter, which is equipped with the “DRS (Demand Regulator System)” that provides overwhelming stability against all attitude changes during flight. The specially designed engine head has a combustion chamber shape that is compatible with the 30% nitro fuel commonly used in 3D flight, and of course, the head is machined to boast high heat dissipation. Combined with the body of the same color, the whole body is anodized in black for a cool appearance. The carburetor diameter has been enlarged to an appropriate size for the power of the 3D Flight, and the exhaust port shape of the cylinder has been changed to an optimized design, taking into account the output characteristics. The DRS, which boasts a stable fuel supply that is unaffected by violent changes in attitude, has been retained, and the crankshaft, which rotates at a higher RPM, has a revised balancer shape to further enhance stability during overflight.
 

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

Pipe: PowerBoost Pipe 105

Contents of box:

SPEED OS 91HZ-R 3D engine

No. 8 plug 

Check Valve

Head gasket 0.2 mm x 1

Instructions