O.S. Engines Rotary 49PI User Manual
Page 11
Firmly bolt the engine's radial mounting flange
to the model or to a rigid test stand, using self-
locking nuts or secondary nuts locked to the
first.
Make sure that the three cap screws securing
the mounting flange to the engine itself, are
tight and are fitted with spring washers.
The engine is normally mounted so that the
carburettor is horizontal on the right side and
the glowplug on the left ( i.e. when viewed
from astern).
The engine should receive a free flow of
cooling air. Do not obstruct airflow with an
oversized spinner.
If the engine is cowled, make sure that the air
entering at the front is able to escape easily:
the outlet area for the cooling air should not be
less than the entry area and should preferably
be larger.
MOUNTING THE ENGINE
Position the fuel tank so that when full, the fuel
level is approximately in line with the fuel jet.
Keep the fuel line short, i.e. install the tank as
close as possible to the back of the motor.
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