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.
Features
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.
Specifications
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
Requirements
Muffler & Fuel
Comments
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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