O.S. Engines 55AX - Manual (Page 7)

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FUEL
The 55AX should be operated on a methanol based fuel
containing not less than 18% (volumetric) castor oil, or a
top quality synthetic lubricant (or a mixture of both), plus
a small percentage (5-20%) of nitromethane for
improved flexibility and power. (The carburetor is
adjusted a little on the rich side at the factory for a fuel
containing 20% lubricant and 15% nitromethane.) Some
commercial fuels also contain coloring additives as an
aid to fuel level visibility. In some cases, these additives
have indicated slightly negative effects on the
performance. We would suggest that you use such
fuels only if you are satisfied that they do not adversely
affect running qualities when compared with familiar
standard fuels. When changing to a fuel brand or
formula that is different from the one to
which you are accustomed, it is a wise
precaution to temporarily revert to in-
flight running-in procedures, until you are
sure that the engine is running entirely
satisfactorily. 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 open 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.
Reminder!
A fuel tank of approximately
350cc capacity is suggested.
This allows around 10-12 minutes flying time,
dependent upon the type of fuel used, the size
of propeller and on the amount of full-throttle to
part-throttle operation throughout the flight.
Fuel Tank
GLOW PLUG
O.S. No.8 glowplug is supplied with the
engine.
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GLOWPLUG IGNITER
Commercialy available handy
glowplug heater in which the
glowplug battery and battery leads are integrated.
Alternatively, one of the
purpose-made manual or
electric fuel pumps may be used to transfer fuel
directly from your fuel container to the fuel tank.
FUEL PUMP
Manual Electric
Electric Starter and
Starter Battery
Required when starting
the engine.
12-Volt lead-acid battery
Electric
Starter
Install a filter on the outlet tube of your
refueling container to prevent entry of
foreign matter into fuel tank. O.S. ‘Super Filters’
(large and small) are available as optional extras.
O.S. Super Filter (Fuel Can Filter)
To prevent the pickup from adhering to
the tank wall under suction and
restricting fuel flow, slots may be filed I
the end of the weight. Alternatively, O.S.
Non-Bubble Weight is available as an
optional extra.
It is recommended to install a good
in-line filter between the fuel tank
and carburetor to prevent entry of
foreign matter into the carburetor.
O.S. Non-Bubble Weight
Fuel Filter
SILICONE FUEL LINE
Heatproof silicone tubing of
approx. 5mm o.d. and 2.5mm i.d.
is required for the connection
between the fuel tank and engine.