A big performance boost for 40-size planes!
Ushering in a new era in O.S. 4-stroke technology: the 56FS-a. It’s the first
in the alpha series, with the latest advancements for boosting your plane’s
performance.
Mounts with no-mod ease in the same space as the 52FS.
In addition to less noise, the muffler features a multi-positional manifold
with a rubber O-ring that helps prevent oil leakage.
A newly designed lubrication system eliminates the need for crankcase ventilation.
The 40NA carburetor is equipped with a venturi that reduces the chance of fuel
leaking out onto the cowl, while also creating more positive air/fuel flow.
It’s like giving your 40-size plane a new lease on life!
SPECIFICATIONS
- Stock Number: OSMG0956
- Displacement: 0.569 cu in (9.32 cc)
- Bore: 0.945 in (24.0 mm)
- Stroke: 0.811 in (20.6 mm)
- Practical rpm range: 2,400-13,000
- Output: 1.0 hp @ 10,000 rpm
- Weight w/muffler: 16.26 oz (461 g)
- Includes: 40NA carburetor, muffler
- Recommended props: Sport & aerobatic; 13×6, 12×6-8; Scale: 13×6-7, 12×6-8





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