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SKU: OS054
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Product Description


The OS FSα-81 is the second engine in the new generation of 4-stroke FsαSeries engines. Since the major dimensions are the same, including the mounting dimensions, the new FSα-81 can easily replace an existing FS-70SII with little reworking. With an increase in power due to the displacement increase in conjunction with light weight, scale type aircraft can realize more scale like flight and sport models an increase in performance. The distinctive shape of the engine and silencer symbolize this new generation of 4-stroke FSα Series engines


Stock Number: OSMG0981
Displacement: 0.809 cu in (13.26 cc)
Bore: 1.091 in (27.7 mm)
Stroke: 0.866 in (22.0 mm)
Weight w/muffler: 20.11 oz (570 g)
Practical rpm range: 2,200-10,000

Propeller : 13x7 – 13x9 – 14x6 – 14x7
Output: 1.3 hp @ 11,000 rpm
Includes: 60RA carburetor, F-5030 muffler
34810 81FS-a Parts Listing


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