O.S. 81FS-α Ringed 4-Stroke Engine for Airplane (with Muffler)
Packing more power into 60-size planes!
Features:
- Mounts easily in the same space as the FS-70SII with no modifications.
- A rubber O-ring on the muffler's multi-positional manifold helps prevent oil leakage.
- The specially designed lubrication system eliminates the need for crankcase ventilation.
- 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.
Package Included:
One O.S. FSa-81 4-stroke Engines
F-5030 Muffler
60RA carburetor
Header
Type F glow plug
Instruction manual
Specifications:
Displacement: 0.809 cu in (13.26cc)
Bore: 1.091" (27.7mm)
Stroke: .866" (22mm)
Weight with Muffler: 19.63oz (556g)
Practical RPM Range: 2200-12,000
Output: 1.3hp @ 11,000 RPM
Height from Bottom of Mounting Tab to Top of Crankcase: 3.8" (97mm)
Width of Crankcase below Mounting Tabs: 1.6" (40mm)
Center of Mounting Holes Same Side: .83" (21mm)
Center of Mounting Holes Opposite Side: 2" (50.8mm)
Center of Front Mounting Hole to Drive Washer: 2.2" (55.5mm)
Center of Rear Mounting Hole to Drive Washer: 3" (76.2mm)
Center of Crankcase to Center of Needle Assembly: 1.4" (35.6mm)
Center of Crankcase to Outer Edge of Needle Assembly: 1.8" (45.7mm)
Muffler Angle in Relation to Engine: 10°
Needle Settings:
High Speed: 2.5 - 3 turns out from fully closed
Mixture Control (low speed): Flush with crab body, then 1 turn in
Requires:
Fuel: 10%-20% nitromethane with 18% lubricant. Synthetic, castor, or a synthetic/castor lubricant blend may be used.
NOTE: Certain four-cycle fuels cannot be used due to low oil content. However, SOME four-cycle fuels such as the Wildcat 4-Cycle 15% may be used due to its 18% oil content. When choosing fuels for this engine, be sure to select a fuel with at least an 18% lubricant content.
Propeller: Sport and aerobatic scale 13x6-8, 14x6-7
Code No. 34810
Note:
We have full range of O.S. products, if you cannot find your desired product(s) in our online store, please send request to cs@rc711.com.
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