O.S. engine MAX-25AX & MAX-35AX Instruction Manual page 7

FUEL
The 25AX and 35AX 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 18% 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.
GLOWPLUG IGNITER
Commercialy available handy
glowplug heater in which the
glowplug battery and battery leads are integrated.
FUEL PUMP
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.
Electric Starter and
Starter Battery
Required when starting
the engine.
12-Volt lead-acid battery
O.S. Super Filter (Fuel Can Filter)
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.
Reminder!
Fuel Tank
A fuel tank of approximately
180cc capacity for 35AX and
160cc capacity for 25AX is suggested.
This allows around 10 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.
12
O.S. Non-Bubble Weight
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.
Manual
Electric
Fuel Filter
It is recommended to install a good
Electric in-line filter between the fuel tank
Starter
and carburetor to prevent entry of
foreign matter into the carburetor.
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.
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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.
S