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The FS-200S is not equipped with manual choke controls,
as it is intended for use with an electric starter only.
A high-torque electric starter not only makes starting the
engine easier, it dispenses with the need for a choke
valve by turning the engine over fast enough to prime the
cylinder.
Starting procedure is as follows:
1.
Check that the current to the glowplug is switched off.
2.
Check that the polarity of the starter battery leads rotates the
engine counter-clockwise when viewed from the front.
3.
Open the needle-valve 3-4 turns from the fully closed
position and set the throttle in the fully open position.
4.
Apply the starter and press the starter switch for 5-6
seconds, or until fuel is seen to emerge from the exhaust
outlet, indicating that the cylinder is now primed.
Close the throttle-arm to within 15-20° of the fully closed
5.
position and slowly turn the prop "backwards" (clockwise)
by hand approximately 1.5 turns until it is arrested by
compression.This is to enable the kinetic energy of the prop
to subsequently assist the starter through the compression
stroke to start the engine.
Energize the glowplug and apply the starter. If the starter
6.
fails to rotate the engine completely, this may be due to the
cylinder being over-primed, or to the starter battery being
insufficiently charged.
For long life and peak performance, every engine needs
special treatment when new, know as "running-in" or
"breaking-in". This is a procedure during which the
engine is operated under strictly controlled conditions at
the beginning of its life, in order to avoid the risk of
immediate damage to certain components through
becoming overheated or stressed and to help working
surfaces to become smoothed and aligned for maximum
mechanical efficiency thereafter. With some engines, this
can require a tediously protracted period of bench
running, but, as O.S. engines are manufactured to fine
tolerances and from the finest quality materials, a
relatively brief running-in period is sufficient and can be
completed with the engine installed in the aircraft.
Prolonged running with too rich a mixture and/or low
speed will not complete the proper running-in. On the
other hand prolonged low speed running may cause the
oil in the fuel to congeal, which may result in seizure of
the piston and cylinder liner.
STARTING
7.
Check these conditions and, instead of pressing the starter
button after applying the starter, have the starter spinning
before applying it to the engine, to give it a "running start".
When the engine starts, slowly open the throttle, leaving
the needle-valve at its rich starting setting to promote cool
running conditions.
However, if the engine slows down because the mixture is
excessively rich, the needle-valve may be closed a little to
speed it up until it runs evenly.
Now disconnect current to the glowplug and gradually
8.
close the needle-valve so that the rpm increases. Make
adjustments to the needle in small steps.
Abrupt changes at this stage are likely to cause the engine
to stall. Restart the engine by simply applying the starter
with the glowplug re-energized and the throttle at its
starting setting.
How to stop the engine
Pull down the throttle lever and trim lever on the transmitter
fully.
Note:
Make sure that the throttle linkage is made so that the
throttle is fully closed when the throttle lever as well as
trim lever on the transmitter are fully pulled down.
18
RUNNING-IN ("Breaking-in")
The recommended procedure is as follows:
1.
Use the same fuel and prop as you intend for flying your
model.
2. Open the needle-valve 3-4 turns from the fully closed
position and start the engine.
3.Open the throttle slowly to the mid speed position, and
disconnect the current to the glowplug.
4. Now open the throttle slowly to the fully opened position
and run the engine for no more than 5 seconds with the
needle-valve tuned to produced near maximum r.p.m.,
then, immediately, slow the engine down again by opening
the needle-valve approximately one turn. The rich mixture,
so induced, will cool the engine, at the same time providing
increased lubrication.
5.
Repeat this process, alternately running the engine fast
and slow by means of the needle-valve, while keeping the
throttle fully open, then begin to extend the short periods of
high-speed operation until two tanks of fuel have been
consumed.
WARNING:
When ground running the engine, avoid dusty or sandy
locations. If dust or grit is drawn into the engine, this can
have a ruinous effect, drastically shortening engine life in
a matter of minutes.
19
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