Aeroplane Engines

Designed specifically for light weight and high power output from a compact crankcase, the Max 35AX is an ideal engine for 'Fun Fly' and 3D flying.

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

The new FSa-56 from O.S. is the first engine in a completely new series of advanced four strokes. The FS ‘Alpha’ series draws on the experience gained from the Surpass range to develop and refine standards to a new level.

One of the later additions to the 'FX' series, the 61FX offers high levels of performance and durability, plus easy handling qualities and a competitive price for serious sport and aerobatic flyers.

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.

The new FSa-81 is a direct replacement for the FS-70 Surpass II, offering greater power and throttle precision in a compact and lightweight design. The crankcase mounting dimensions allow the FSa-81 to slot into the same mount that an FS -70S II would for an instant power upgrade.

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.