O.S. engine max-21RG-M Owner's Instruction Manual page 12

PROPELLER
Use well balanced propellers only. As the ideal
diameter, pitch and shape vary according to the size,
weight and type of model, final selection can be made
after practical experiment. As a starting point,
suggested propeller diameter is 40-44mm with a
pitch/dia ratio of 1.0-1.6 for Vee type hulls.
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.
BATTERY INTEGRATED GLOWPLUG HEATER
Commercialy available handy glowplug
heater in which the glowplug battery
and battery leads are integrated.
ELECTRIC STARTER AND STARTER BATTERY
Use a 12-volt electric starter
with suitable battery for starting
the engine.(21RG-M)
FUEL PUMP
For filling the fuel tank, a simple, poly-
ethylene "squeeze" bottle, with a suit-
able spout, is required.
LONG SOCKET WRENCH
Recommended for easy removal and
replacement of the angled and
recessed glowplug, the O.S.Long
Socket Wrench incorporates a
special grip.
SILICONE FUEL LINE
This is required
connection between the fuel
tank and engine, also for the
water-cooling system.
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for the