OS Heli Engines

Designed for .30 class sport and scale helicopters, the 32SX-H Ring has an identical specification to the 32SX-H, but uses a ringed piston/liner assembly to give a lower compression on start-up without sacrificing top end power and performance. Shown with optional drive washer.

D-12986 O.S. MAX 32SX-H Ring without Drive Washer

Following on from the concept developed in the 70SZ-H, the latest 37SZ-H brings a new level of performance to '30-class' helicopters.

Just about everything has been changed compared to the 32SX-H in the pursuit of power and control.

The class leader in the mid-range helicopter market has grown to be a ‘50’. This fabulous engine draws on O.S’s extensive, World Championship winning experience to produce a stunning 1.8bhp at 17,000rpm. That translates into the highest power output in the class and a wide spread of useable torque.

This is possibly the one of the best 50 Class engines on the market. The CNC Head has been developed to give more power and improve the cooling, while the new carburettor has also been given the treatment to enable the engine to put out 1.8BHP Oh yes loads of grunt just what you want.

All this with out scarificing the throttle precision you have come to expect from O.S.

The Latest '91' class engine for FAI F3C competition dominated the 2005 World championships and is still being hailed as the Engine of choice, for most F3C Piolits.

This totaly new engine has been designed from scratch as a pure heli engine, as is evident from the unique sZ crankcase.

Similar to the standard 91SX-H C-Spec but with the added advantage of the stunning new 'Viper' head. Not only does this cylinder head improve power, it also improves cooling and throttle response as well. In some way, this can be attributed to the twin glowplug system.