O.S. engine MAX-15 Owner's Instruction Manual page 14

Methanol
Castor Oil
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 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.
PROPELLER
Suggested propeller sizes are given in the table.
As the ideal propeller diameter, pitch and blade area
vary according to the size, weight and type of model,
final propeller selection will require in flight
experimentation.
Reminder!
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.
A B
75% 65%
20% 20%
5% 10%
Running-in
15LA-S 8 4
25LA-S
9 6
40LA-S 11 5
46LA-S
11 6
GLOWPLUG
An O.S. A3 glowplug is installed in the engine.
Other recommended O.S. plugs are Nos.8 and A5.
Carefully fit plug finger-tight, before final tightening
with the correct size plug wrench.
The role of the glowplug
With a glowplug engine, ignition is initiated by the
application of a 1.5-volt power source. When the battery
is disconnected, the heat retained within the combustion
chamber remains sufficient to keep the plug filament
glowing, thereby continuing to keep the engine running.
Ignition timing is 'automatic' : under reduced load,
allowing higher rpm, the plug becomes hotter and,
appropriately, fires the fuel/air charge earlier;
conversely, at reduced rpm, the plug become cooler and
ignition is retarded.
13
Aerobatic & Sport
~
8 4 6
9 6,10 5
~
11 5 6
~ ~
11 6 7,12 5 6