Manual

6
NOTES
Adjust the throttle linkage so that the engine
stops when the throttle stick and trim lever
on the transmitter are fully retarded.
Alternatively, the engine may be stopped by
cutting off the fuel supply. Never try to stop
the engine physically.
Take care that loose clothing (ties, shirt
sleeves, scarves, etc.)do not come into
contact with the propeller.Do not carry loose
objects (such as pencils, screwdrivers, etc.)
in a shirt pocket from where they could fall
through the propeller arc.
Do not start your engine in an area
containing loose gravel or sand.
The propeller may throw such material in
your face and eyes and cause injury.
For their safety, keep all onlookers
(especially small children) well back (at
least 20 feet or 6 meters) when preparing
your model for flight. If you have to carry
the model to the take-off point with the
engine running, be especially cautious.
Keep the propeller pointed away from you
and walk well clear of spectators.
Warning! Immediately after a glowplug-
ignition engine has been run and is still
warm, conditions sometimes exist whereby
it is just possible for the engine to abruptly
restart if the propeller is casually flipped
over compression WITHOUT the glowplug
battery being reconnected. Remember this
if you wish to avoid the risk of a painfully
rapped knuckle!
7
The O.S. rotary combustion engine, based
on NSU/Wankel System, was the world's
first production model engine of the rotary-
piston type as invented by Felix Wankel in
1957 and produced by NSU/Wankel in 1959.
This highly successful application of the
NSU/Wankel System to a power unit of
miniature proportions, has only been made
possible by the expertise of O.S. research
and development engineers and by the
high levels of precision craftsmanship
achieved in its tooling and manufacture.
Operating principle
In place of the piston and cylinder of a
conventional reciprocating engine, the
Wankel motor has a three-lobe rotor which
moves in a circular path, while rotating
about its own axis, within a housing having
ABOUT THE ENGINE
an epitrochoidal bore – i.e. a wide-waisted
figure-of eight shape. Planetary rotation is
controlled by an eccentric shaft, an
internally-toothed gear and a fixed pinion
mounted centrally on the rear cover plate.
The tips of the rotor are in continuous
contact with the housing, forming three
chambers, reach of which changes in
volume, with rotation, to effect suction,
compression, expansion and exhaust
phases, as in a four-stroke reciprocating
engine. Spring-loaded tip seals on the rotor
prevent gases from passing from one
chamber to the adjoining one and the rotor
uncovers ports, as in a two-stroke engine,
to control intake and exhaust timing.