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

Advanced 4-stroke engineering for 40-size airframes

The O.S. Engine OSMG0956 56FS-a brings a series of practical upgrades aimed at hobby flyers of 40-size aircraft. As the alpha-series debut, it delivers targeted improvements while keeping the same installation footprint as the 52FS for a clean engine change.

Practical improvements that matter on the field

Its muffler uses a multi-positional manifold and a rubber O-ring to help prevent oil seepage and reduce noise. The updated lubrication scheme removes the requirement for crankcase venting, making preflight checks and maintenance simpler.

More stable fuel feed and combustion

Equipped with the 40NA carburetor, the 56FS-a benefits from a venturi design that curbs fuel leakage and smooths air and fuel flow. The result is steadier idling, crisper throttle response, and efficient combustion across the rev range.

Whether you fly casually or compete, the O.S. Engine OSMG0956 56FS-a is built to make installation easy and deliver reliable 4-stroke performance in 40-size airframes.