| Features
O.S. 81FS-a 4-Stroke
EngineOSMG0981
 Features
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O.S. 81FS-a 4-Stroke
EngineOSMG0981
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Mounts easily in the same
space as the FS-70SII with no modifications.
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A rubber O-ring on the
muffler's multi-positional manifold helps prevent oil leakage.
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The specially designed
lubrication system eliminates the need for crankcase ventilation.
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The 60RA 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.
Specifications
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Displacement: 0.809 cu in
(13.26cc)
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Bore: 1.091" (27.7mm)
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Stroke: .866" (22mm)
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Weight with Muffler: 19.63oz
(556g)
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Practical RPM Range:
2200-12,000
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Output: 1.3hp @ 11,000 RPM
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Height from Bottom of Mounting
Tab to Top of Crankcase: 3.8" (97mm)
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Width of Crankcase below
Mounting Tabs: 1.6" (40mm)
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Center of Mounting Holes Same
Side: .83" (21mm)
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Center of Mounting Holes
Opposite Side: 2" (50.8mm)
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Center of Front Mounting Hole
to Drive Washer: 2.2" (55.5mm)
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Center of Rear Mounting Hole
to Drive Washer: 3" (76.2mm)
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Center of Crankcase to Center
of Needle Assembly: 1.4" (35.6mm)
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Center of Crankcase to Outer
Edge of Needle Assembly: 1.8" (45.7mm)
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Muffler Angle in Relation to
Engine: 10°
Package Contents
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O.S. 81FS-a 4-Stroke Aircraft
Engine, carburetor, muffler, header, type F glow plug, manual
Requirements
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Fuel: 10%-20% nitromethane
with 18% lubricant. Synthetic, castor, or a synthetic/castor lubricant blend
may be used.
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NOTE: Certain four-cycle fuels
cannot be used due to low oil content.
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However, SOME four-cycle fuels
such as the Wildcat 4-Cycle 15% (CATP9109) may be used due to its 18% oil
content.
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When choosing fuels for this
engine, be sure to select a fuel with at least an 18% lubricant content.
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Propeller: Sport and aerobatic
scale 13x7-9 or 14x6-7
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