O.S. FS-81 ALPHA
• Displacement: 13.26cc 0.809cu.in
• Bore: 27.7mm
• Stroke: 22mm
• Output: 1.3ps/11000r.p.m
• Practical R.P.M: 2200-12000
• Weight: 556g
• Prop size: 13x7-9 - 14x6-7
Suppliers Comments
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| 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. Like the FSa-56, the crankcase breather system has now been incorporated inside the engine to negate the need for an external vent and the excess oil that emanates from it. A propeller locknut assembly is of course standard. The new F-5030 silencer is very effective, thanks to its internal baffle and carefully matched internal volumes and passages. The design allows a huge range of outlet positions to accommodate almost every model. Even the distance away from the engine can now be adjusted. The latest 60RA carburettor features a ‘constant velocity’ inlet for improved throttle response and reduced spitting. |
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