The Light Weight Engine Houtekietstraat 11
B-8540 Deerlijk, Belgium
EFFECTIVITY page 24
ALL 19-3-2019
It is recommended to notice the level before and after turning the propeller in order to memorise the
increase of the level. Once this is memorised one may not need to turn the propeller each time to
control the oil level as the increase should be always the same.
Operation
Same as for all engines, the way to treat your engine will increase or decrease tremendously the life-
time, the consumption, the maintenance costs and deterioration of your engine. Following a few
recommendations for the right use of the D-Motor type LF39:
• The take-off or full power setting should be applied only once the engine, respectively the
cooling liquid and oil has reached its minimum temperature of 50°C.
• It is recommended to reduce the power setting after the take-off and once you reached the
safety altitude, and to fly instead a little bit faster. Even if the aircraft does not climb as fast as
possible, in total you reach faster your destination, and the most important it means less
consumption and deterioration. It is recommended not to hang the aircraft at the propeller, if it
is not required to climb as fast as possible due to geographical obstacles.
• To fly fast does not always mean to gain a lot of time to reach your destination. By reducing the
power setting speed is reduced only slightly, but the consumption is massively lower. Further
your range is much higher. Please see therefore the consumption table under paragraph “7.5
Range and Fuel Consumption”.
• Avoid rapid changes of the power setting (except in case of emergency). It is better to increase or
decrease the power setting slowly but constantly. Massive power setting changes in a short time
does always means high stresses for the crankshaft, especially for direct driven engines.
• Each engine coming from serial production has its typical behaviour at different regimes. This is
like a character of each individual engine. Even if the LF39 is an engine which runs extremely
smoothly, it’s recommended to avoid regimes where your engine shows up with more vibrations.
Often the RPMs of higher of fewer vibrations are nearby and only a few RPMs away from each
other.
• In case your engine shows unexpectedly starting difficulties they may occur from impurities in
the injectors or on the spark plugs. These impurities may be eliminated by using a special
cleaning program. To start the cleaning program, set the throttle to full power setting, switch on
the ignition and the ECU, and activate the starter for a few seconds. In this configuration the
engine will not start, but initiate only the cleaning program.
After running the cleaning program switch OFF the ECU, then switch the ECU ON again and try
once more to start up the engine in the normal way.
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