O.S. Engines FS-30S - Manual (Page 8)

14
Trainer & Scale Sport & Aerobatic
GLOWPLUG
The FS-30S and FS-40S are supplied with an O.S.
Type F glowplug, specially designed for O.S. four-
stroke engines.
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.
FS-40S 10x7-7.5, 11x6 10x7, 10.5x6, 11x7
12x5-6
Install a plug suitable for the engine.
Use fuel containing a moderate percentage of
nitromethane unless more is essential for racing
events.
Do not run the engine too lean and do not leave the
battery connected while adjusting the needle.
However, plug life can be extended and engine
performance maintained by careful use, i.e.:
Apart from when actually burned out, a plug may
need to be replaced because it no longer delivers its
best performance, such as when:
When to replace the glowplug
Filament surface has roughened and turned white.
Filament coil has become distorted.
Foreign matter has adhered to filament or plug
body has corroded.
Engine tends to cut out when idling.
Starting qualities deteriorate.
Glowplug life
Particularly in the case of very high performance
engines, glowplugs must be regarded as expendable
FS-30S 9x6-7, 10x4 10x5-6
15
STARTING THE ENGINE
Preparations
1 Installing the glowplug
Install the washer on the
glowplug and screw carefully
into cylinder-head, making sure
that it is not cross-threaded
before tightening firmly.
Washer
Glow plug
2 Installing the propeller
There is a risk, particularly with four-stroke engines, of
the propeller flying off if the propeller nut loosens due
to detonation or "knocking" when the engine is run too
lean or under too heavy a load. To prevent this from
happening, it is recommended to use the special
Propeller Locknut Set (optional extra) with the FS-
40S.
Wrench
Tighten the propeller nut
firmly so that compression
is first felt around this
position(i.e. with blades
horizontall) when turning
the propeller in the
direction of arrow.
3 Filling the fuel tank
Re-connect fuel line to
engine after tank is
filled.
Disconnect
fuel line from
the fuel inlet,
and connect
it to the
tubing from
the fuel
pump.
Do not let dirt or
dust enter fuel can.
Fuel (model
glow-plug
engine fuel)
Fuel pump
Use a fuel can filter
(e.g. O.S. Super Filter).