O.S. Engines, FS-52 SURPASS HELICOPTER

Hobbies R Us

OSMG1952   O.S.   FS-52 Surpass Heli

TECH NOTES
     This is one of the O.S. Surpass series of 4-stroke model engines.
The Surpass series is the 2nd series of 4-stroke engines (The 1st series was
the FS series, discontinued and replaced by the Surpass series in 1986-7.
"Surpass" refers to the fact that the surpass series gained 30% more power than
the previous FS series. Covered under 2 YEAR WARRANTY.
This is especially designed for the Kyosho Nexus Legato.

Some differences between a 4-stroke and a 2-stroke engine:
    4-strokes are quieter
    4-strokes get better fuel economy
    2-stroke generate more rpm (A 2-stroke will rev to around 11,000-13,000 rpm
        with a prop; a 4-stroke will rev to around 9,500 rpm)
    4-strokes generate much more torque and will thus, swing a larger prop
    4-strokes have a more realistic sound, like a REAL aircraft engine.

Features:
   Rear-mounted updraft carburetor  30% larger intake valves than the FS series
   Helix gear-driven camshaft       Ringed piston
   Ball bearing-supported camshaft and crankshaft

Specifications:
    Bore: 23.0mm (.906")                  Stroke: 20.6mm (.811")
    Power Output: .90 BHP at 12,000 rpm   Weight: 402g (14.19 ozs.)
    Practical rpm Range: 2,300 - 13,000 rpm
    Crankshaft Thread Size: 1/4" X 28
    Valve Clearance: Between .04mm and .1mm (or between .0015" and .004",
                     measured between the valve tip and rocker arm)
    Length: 80.5mm (3.17") from the backplate to the front of the drive washer
    Width: 34mm (1.33") width of engine neglecting the mounting flanges
           44mm (1.73") distance between the centers of the mounting holes
    Height: 101mm (3.97")
    Construction: Aluminum and Aluminum alloys

Requires: Fuel with 5%-30% Nitromethane and 18% oil content USE HELI FUEL!!
          USE 2-STROKE FUEL (all 5%-15% fuels we carry meet these requirements)

Includes: Glow plug, instruction sheet, O.S. decal, and O.S. engine line-up
           poster.

COMMENTS: The difference between the airplane and helicopter versions are:
              Airplane                       Helicopter
            Includes drive washer          No drive washer
            Includes woodruff key          No woodruff key
            Includes header                No header, use OSMG2872 for header
            Includes muffler               No muffler   and muffler assembly.
            Long crankshaft                Shortened crankshaft (OSMG4712)

 
ACCESSORIES
THIS IS AN R/C HELICOPTER ENGINE.  STARTING EQUIPMENT IS IN HELICOPTER ACG.
MUST USE FUELS WITH 5%-15% NITROMETHANE AND MINIMUM 18% LUBRICANT (HELICOPTER
 FUEL)