O.S. Engines Rotary 49PI - Manual (Page 12)

BEFORE STARTING
Tools, accessories, etc.
The following items are necessary for operating
the engine.
FUEL
For this engine, use top quality methanol-based mod-
el engine fuel containing approximately 25% castor-oil
and between 5% and 15% nitromethane.
REMINDER!
Model engine fuel is poisonous.
Do not allow it to come into contact with
the eyes or mouth. Always store it in a
clearly marked container and out of the
reach of children.
Model engine fuel is also highly flammable.
Keep it away from naked flame, excessive
heat, sources of sparks, or anything else
which might ignite it. Do not smoke or
allow anyone else to smoke, near to it.
The suitability of the prop depends on the size and
weight of the model and type of flying. Determine the
best size and type after the engine has been run in.
Check the balance of the propeller before fitting it to
the engine. Unbalanced propellers cause vibration
and loss of power. Wooden propellers are to be pre-
ferred. Some nylon propellers are not strong enough
to withstand the high power output of these engines
and a thrown blade can be very dangerous. As a
starting point, we recommend 9x5~6, 9.5x5 and 10x5
for general use.
Never touch, or allow any object to
come into contact with, the rotating
propeller and do not crouch over the
engine when it is running.
PROPELLER
REMINDER!
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