O.S. Engines IL-300 - Manual (Page 9)

16
GLOWPLUG HEATING
Glowplug battery
It is necessary to use a glowplug battery of fairly large
capacity (10Ah or more) as this is required to heat four
glowplugs simultaneously.
A heavy-duty 1.5-volt dry battery or (preferably) 1.2-volt Ni-
Cd battery may be used.
Ni-Cd (nickel-cadmium) 1.2-volt rechargeable battery
Use a 10-Ah cell, or 4 to 5 2.0-Ah cells (as commonly used
for electric-powered R/C cars) wired in parallel and with
short heavy leads (to minimize voltage drop) to the
connection point on the fuselage.
Glowplug leads
The plug leads are fitted with special snap-on connectors
that ensure firm contact with O.S. plug. They are a "click" fit
and are not suitable for use with most other makes of
glowplug.
The earth (ground) lead is fitted with a plug terminal which
should be connected to the engine by means of one of the
mounting screws.
Make sure that no part of the wiring touches the cylinder
head or cooling fins.
Keep wiring away from the fuel tank where it might cause a
fire in the event of a short-circuit.
Switch should have
sufficient capacity.
Install Ni-Cd battery in the fuselage, and switch on or off by means
of transmitter. (On-board battery)
1.2 volt Ni-Cd battery with
more than 10 Ah capacity.
1.
A commercially available glowplug heating source will
enable you to turn the current on or off by using a
transmitter auxiliary channel establishing a more reliable
idle.
17
If glowplug leads are extended
together as a single cable, use
heavier wire, e.g. 2.0mm
multi-strand copper core as
supplied for earth lead.
2
2 2.0mm
Earth (ground)
lead
Fasten to the
motor mount.
Glowplug re-heat
Under normal conditions, the engine will idle sufficiently
slowly with the throttle closed to permit a safe landing
approach. However, if conditions (atmospheric, fuel,
tank location etc.) are unfavorable, there may be a
tendency for one cylinder to cease firing if the engine is
throttled down to a very low idling speed. This can be
prevented by installing a small on-board Ni-Cd battery
which will automatically re-heat the glowplugs when the
engine is throttled down to idling speed. A suitable
switch should be installed so that it is actuated by the
throttle servo only when the engine is throttled down.
2. Connect terminals to the
fuselage.
3. Install a jack on the
fuselage.
Ni-Cd
Ni-Cd