O.S. Engines, .70 SZ-H Ring Heli

Hobbies R Us

OSMG1972   O.S.   .70 SZ-H Ring Heli

TECH NOTES
        This is the .70 SZ-H Ring Engine from O.S. designed with the
                           FAI F3C Pilot in mind.

FEATURES: Ringed for long life.
          3-needle carb for ultimate tuning precision.
          Two Extra Mounting Lugs on the front, allow modelers to mount
            the engine securely in helis.
          Designed with the FAI F3C competitor in mind, allowing 3D pilots an
            edge of the standard .60 size engine.
          Throttle assembly reference marks make it easy to note and restore
            finely tuned settings after maintenance.
          Front and rear ball bearing supported crankshaft reduces friction
            and wear.
          Large Heli cylinder head offers generous cooling fin area, with
            increased webbing on crankcase front for heat dissipation.
          Installs in the same space as a .61 engine.

INCLUDES: One .70SZ-H Ringed Helicopter engine
          One woodruff key
          #8 OS Glow Plug  and Decals

REQUIRES: Muffler & Fuel

SPECS:   Displacement: 11.50cc (.702cu in)
         Bore: 25.8mm (1.016in)                Stroke: 22.0mm (.866")
         Power Output: 2.5HP at 16,000 RPM     Weight: 553.5g (19.5 ozs.)
         Practical RPM Range: 2,200 - 12,000 RPM
         Crankshaft Thread Size: 5/16 " X 24
         Length: 81.3mm  Backplate to the front of the crankcase
         Width:  42.6mm  width of engine neglecting the mounting flanges
                 25mm    distance between centers of the mounting holes
                 60mm    Distance from rear mount to front mount centers
                 52mm    Side to side centers of rear mounting holes
                 42mm    Side to side centers of foremost mounting holes

COMMENTS: Engine is shipped with the carb lightly fitted. Be sure to tighten
          prior to use.


COMMENTS: This engine will fit in most .60 size helicopters, and should work
           well without the need for gear changes.