Rally Pilot Operating Handbook
Copyright 2008, Rally Aircraft
Revision 4.1
48
7.14 STARTING ENGINE
Ordinarily the engine starts easily with one or two strokes of primer in warm tem-
peratures to six strokes in cold weather, with the throttle open approximately 0.4
in. In extremely cold temperatures, it may be necessary to continue priming while
cranking. Weak intermittent firing followed by puffs of black smoke from the ex-
haust stake indicate overpriming or flooding. The starting should be suspended for
a while before attempting again without priming. If the engine is underprimed,
most likely in cold weather with a cold engine, it will not fire at all and additional
priming will be necessary. As soon as the cylinders begin to fire, open the throttle
slightly to keep it running. After starting, if the oil gage does not begin to show
pressure within 30 seconds in the summertime and about twice that long in very
cold weather, stop the engine and investigate. Lack of oil pressure can cause seri-
ous engine damage.
WARNING!
Do not take the engine into operation if any person is near the aircraft.
•
Fuel cock ..........................................
Open
•
Starting carb....................................
Activated
NOTE
: If the engine is already in operating temperature, start the engine without
choke.
•
Throttle
lever ................................... Set to idle position.
•
Master switch ..................................
On
•
Ignition .............................................
Both circuits switched on
•
Starter button..................................
Actuate
ATTENTION
: Activate starter for max. 10 sec. only (without interruption), followed
by a cooling period of 2 minutes! As soon as engine runs, adjust throttle to achieve
smooth running at approx. 2500 rpm. Check if oil pressure has risen within 10 sec-
onds and monitor oil pressure. Increase of engine speed is only permitted at steady
oil pressure readings above 2 bar (30 psi). At an engine start with low oil tempera-
ture, continue to observe the oil pressure, as it could drop again due to the in-
creased flow resistance in the suction line. De-activate starting carb.
ATTENTION:
Since the engine comprises a reduction gear with shock absorber,
take special care of the following: To prevent impact load, start with throttle lever
in idle position, or at the most, up to 10% open. For the same reason, wait for
around 3 sec. after throttling back to partial load to reach constant speed before re
-acceleration. For checking the two ignition circuits, only one circuit may be
switched off and on at a time.
ATTENTION
: Do not actuate starter switch) while the engine is running. Wait until
the engine comes to a complete stop!
