| Features
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
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O.S. 70SZ-H Ringed OSMG1972
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Ringed for long life. 3-needle
carb for ultimate tuning precision. (Settings are covered on pages 14 & 15
of the manual)
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High Speed: 2 turns OUT Medium
Speed: 1 tunn OUT Idle Mixture: Refer to picture on page 14
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Two extra mounting lugs on
front allow modelers to mount engine securely in helis.
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Designed with the FAI F3C
competitor in mind, allowing 3D pilots an edge over the standard .60 size
engine.
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Throttle assembly reference
marks make it easy to note and restore finely tuned settings after
maintenance.
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Front and rear ball
bearing-supported crankshaft reduces friction and wear.
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Large heli cylinder head
offers generous cooling fin area, with increased webbing on crankcase front
for heat dissipation.
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Installs in the same space as
a .61 engine.
Specifications
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Displacement: 11.50cc (.702cu
in)
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Bore: 25.8mm (1.016in) Stroke:
22.0mm (.866")
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Power Output: 2.5HP at 16,000
RPM Weight: 553.5g (19.5oz)
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Practical RPM Range: 2,000 -
18,000 RPM
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Crankshaft Thread Size:
5/16-24
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Length: 81.3mm Backplate to
the front of the crankcase
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Width: 42.6mm width of engine
neglecting the mounting flanges
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25mm distance between mounting
hole centers
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60mm Distance from rear mount
to front mount centers
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52mm Side to side centers of
rear mounting holes
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42mm Side to side centers of
foremost mounting holes
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42mm distance between mounting
holes for exhaust
Package Contents
Requirements
Comments
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Engine is shipped with the
carb lightly fitted. Be sure to tighten prior to use.
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This engine will fit in most
.60 size helicopters, and should work well without the need for gear
changes.
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