Aeroplane Engines

The first engine in the AX series, the 46AX features a new rear-mounted needle valve system that tolerates crash damage better. The new carburettor has been refined further to make adjustments more precise and throttling even more progressive.

Designed to combine maximum power with razor sharp throttle response in the smallest possible crankcase, the 55AX has the same mounting dimensions as the popular 46AX above, but an increase in power to 1.70PS

Sharing the same mounting dimensions as the old FL-70 and FS-70U, the new FSa-72 is a simple bolt-in replacement offering compact external dimensions and power/torque to most types of model designed for .46 2 strokes or .70 4 strokes. Like all the FSa series, the FSa-72 has internal crankcase oil re-circulation, a super-smooth carburettor with anti 'spit' inlet and an ultra-quiet silencer. If you have a flying filed 'noise' problem, then this is the engine you need for your average sport model. The new 61N carburettor provides both linear and fuel efficient mixing to gain you reliability and precison control at all RPMs.

The third engine in the new ‘AX’ range of high performance 2 stroke engines fills a convenient gap between the existing 61FX and 91FX, yet features the radical new style pioneered with the fabulous 55AX.

Developed from the popular FS 91 Surpass and honed to perfection in this latest model.

Like its 52, 70 and 120 stablemates, the new FS 91 Surpass II features a new carburettor, longer crankshaft, plated camshaft/crankshaft/ ring and assure it's owner of the best performance in it's class coupled to the O.S. legendary quality and long life

Designed to replace the 91FX yet retain the same mounting dimensions but with increased power and torque.

The largest, single-cylinder four stroke engine that OS has ever made draws on unrivalled experience in engine design. This powerful, high-torque engine has been created with scale and sports-scale modellers in mind. The ability to turn a big propeller, yet offer compact external dimensions, makes the fitment inside the ‘tight’ cowling of scale models a real joy.

The second engine in the latest O.S. GT series of petrol engines is designed for the new class of models that are emerging onto the market that are specifically targeted at this size and type of engine. Many of these models are sleek in design, so O.S. has chosen a rear mounted Walbro carburettor with reed valve induction

The biggest single cylinder engine made by O.S. so far is the first O.S. engine for many decades to be spark ignition using petrol as a fuel.

O.S. have started from the ground up and built a completely new engine with the GT55. The styling is unmistakably O.S. yet draws on their extensive experience in engine design to keep weight to a minimum and power, torque and cooling to a maximum.