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Product Reviews:	Review 1
Tower Catalog Page:	197
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                This is the O.S. 56FS-a Four Stroke Engine.
               Same mounting dimensions as the FS-52 Surpass.

FEATURES: Improvements over the original FS series include;
            Elimination of Crankcase venting-excess crankcase oil is now drawn
             into the Rocker Cover, injected back into the combustion chamber.
            Stronger Connecting Rod, Wristpin and Valve assembly
            Extended intake tube on Carburetor restrains the reverse flow of
             the air/fuel mixture
            Decreased width Camshaft housing for less interference with sides
             of aircraft nose section
           F-4040 muffler with adjustable offset and outlet direction for
             easier cowl installations
           40NA two needle Carburetor

INCLUDES:  O.S. Max 56FS-a Four-Stroke Engine with F-4040 muffler, type "F"
            header pipe, glow plug, instruction manual

REQUIRES: Fuel: 5-20% nitro with 18% lubricant content
          Propeller: Sport & aerobatic; 13x6, 12x6-8
                     Scale; 13x6-7, 12x6-8
            (break-in engine with prop intended for use on model)
          Electric starter, glow starter and field equipment

SPECS:    Displacement: 0.569 cid (9.32cc)
          Bore:   .945"   (24mm)
          Stroke: .811" (20.6mm)
          Practical RPM: 2,400-13,000
          Weight: 14.8oz (419g)
          Crankshaft Size: 1/4-28
          Break-in Needle Valve Settings: 2-2.5 turns from fully closed
          Distance Between Mounting Holes Same Side:     .69" (17.5mm)
          Distance Between Mounting Holes Opposite Side: .16"   (44mm)
          Height from Crankshaft Center to Rocker Cover: 3.3"   (84mm)
          Distance from Crankcase Center to Prop Hub:      2" (50.8mm)
          Distance from Crankcase Center to End of Crankshaft: 3.5" (88mm)
          Distance from Crankcase Center to Throttle Lever Center:1.3" (32.5mm)
          Width of Crankcase Below Mounting Tabs: 1.3" (34.1mm)
          Angle of Muffler in Relation to Engine: 11°

          Needle Settings: High Speed: 2.5 - 3 turns out from fully closed
                           Low Speed:  Flush with carb body

                                                                    jxs 4/19/07
                                                                         ir/jxs
                                                               updt jxs 8/27/07
                                                               updt lmm 3/31/09



– 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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