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O.S. 70SZ-H Ringed OSMG1972

O.S. 70SZ-H Ringed OSMG1972
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Item #:17000

O.S. 70SZ-H Ringed OSMG1972

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


  • O.S. 70SZ-H Ringed OSMG1972

  • Ringed for long life. 3-needle carb for ultimate tuning precision. (Settings are covered on pages 14 & 15 of the manual)

  • High Speed: 2 turns OUT Medium Speed: 1 tunn OUT Idle Mixture: Refer to picture on page 14

  • Two extra mounting lugs on front allow modelers to mount engine securely in helis.

  • Designed with the FAI F3C competitor in mind, allowing 3D pilots an edge over 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.


  • 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 (19.5oz)

  • Practical RPM Range: 2,000 - 18,000 RPM

  • Crankshaft Thread Size: 5/16-24

  • Length: 81.3mm Backplate to the front of the crankcase

  • Width: 42.6mm width of engine neglecting the mounting flanges

  • 25mm distance between mounting hole centers

  • 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

  • 42mm distance between mounting holes for exhaust

Package Contents

  • O.S. 70SZ-H Ringed OSMG1972

  • #8 OS Glow Plug and Decals


  • Muffler & Fuel


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

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

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