no. 2711 O.S. Max .91 RX-HG Heim Version

Product information: 14.95 cc capacity. Rear-exhaust helicopter engine with 8 mm GRAUPNER / Heim crankshaft.

Instruction PDF (German/English/French)

O.S. Max .50 Hyper SX-HG (Side -exhaust) engine part no. 2718

This is a High Performance Engine Developed Expressly for F3C M Class Helicopter Competition Utilizing .50 Cubic Inch Engines.

The Engine Uses the Same Mounting Hole Spacing as the O.S. 46FX-H Ring, Making the Two Engines Interchangeable. A Special Machined Drive Washer and Dual Throttle Levers are supplied as standard for Helicopter Use.