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        This is the glow powered O.S. 81FS-a 4-Stroke Aircraft Engine.

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, header,
            type F glow plug, manual

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%
            (CATP9109) 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 13x7-9 or 14x6-7

SPECS:    Displacement: 0.809 cu in (13.26cc)
          Bore:   1.091" (27.7mm)
          Stroke:  .866"   (22mm)
          Weight with Muffler: 20.11oz (570g)
          Practical RPM Range: 2200-10,000
          Output: 1.3hp @ 11,000 RPM
          Height from Bottom of Mounting Tab/Top of Rocker Cover: 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 Prop Washer: 2.2" (55.5mm)
          Center of Rear Mounting Hole to Prop Washer: 3" (76.2mm)
          Center of Crankshaft to Center of Needle Assembly: 1.4" (36mm)
          Center of Crankshaft to Outer Edge of Carburetor: 1.8" (45mm)
          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 carb body,
                                       then 1 turn in.
                                                                   jxs 12/21/07
                                                                         ir/jxs
                                                                updt lmm 4/6/09



– If you need more information, use these O.S. resources –

Click Here: Manufacturer's Product Web Page
E-mail: enginesupport@hobbico.com
Web Site: http://www.osengines.com/
Phone: 217-398-8970


 
Postal Address:
O.S.
3002 N. APOLLO DRIVE, SUITE #1
CHAMPAIGN, IL 61822  








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