O.S. Engine OSMG0956 56FS-a 4-Stroke Unit for 40-Size Aircraft  [OSMG0956]

Smart 4-stroke upgrade for 40-size aircraft

The O.S. Engine OSMG0956 56FS-a is the alpha-series 4-stroke developed for 40-size models, introducing targeted refinements while retaining the same installation envelope as the 52FS. That makes it a practical choice for pilots looking to upgrade without major airframe changes.

Engine refinements that reduce fuss

The muffler assembly uses a multi-positional manifold and a rubber O-ring to help prevent oil seepage and reduce exhaust noise. Its revised lubrication system removes the need for crankcase ventilation, simplifying installation and routine care.

Carburettor and combustion improvements

The 56FS-a is supplied with the 40NA carburettor, whose venturi design cuts fuel dribble and smooths the air/fuel flow. The outcome is steadier running, improved throttle response, and efficient combustion across the usable rpm range.

The O.S. Engine OSMG0956 56FS-a suits modellers who want a straightforward 4-stroke swap for 40-size airframes, offering improved sealing and a simpler lubrication arrangement.