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OS FS-81 Alpha

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OS FS-81 Alpha

FEATURES:
  • Same mounting dimensions as the O.S. Max FS-70 Surpass
  • Ideal fit for 60 size planes
  • Specially designed lubrication system eliminates need for crankcase ventilation
  • 60RA carburetor
  • F5030 muffler with rubber O-ring in multi position manifold to help prevent oil leakage

    INCLUDES: O.S. 81FS-a 4-Stroke Aircraft Engine, carburetor, muffler, type F glow plug, manual

    REQUIRES:
  • Fuel: 10%-20% nitromethane with 18% lubricant. Synthetic, castor, or a synthetic/castor lubricant blend may be used.
  • Propeller: Sport and aerobatic scale 13x7-9 or 14x6-7

    SPECS:
  • Displacement: 0.809 cu in (13.26cc)
  • Bore: 1.091" (27.7mm) Stroke: 0.866" (22.0mm)
  • 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: 0.83" (21mm)
  • Center of Mounting Holes Opposite Side: 2" (50mm)
  • Center of Front Mounting Hole to Drive Washer: 2.2" (55.5mm)
  • Center of Rear Mounting Hole to Drive Washer: 3" (76.5mm)
  • Center of Crankcase to Center of Needle Assembly: 1.4" (36mm)
  • Center of Crankcase to Outer Edge of Needle Assembly: 1.8" (45mm)
  • Muffler Angle in Relation to Engine: 10°
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