The Light Weight Engine Houtekietstraat 11
B-8540 Deerlijk, Belgium
EFFECTIVITY page 15
ALL 19-3-2019
Description
The D-Motor LF 39 is a 100% water cooled boxer motor with side steered valves for direct driven
propellers. The motor has a lambda probe and performance map controlled multi field injection with
double ignition. The 300W/25A generator is fully integrated; the oil and cooling liquid pumps are
directly driven by the camshaft. The fuel pressure is hold at a constant level by a pressure regulator,
which is connected to the back flow circuit. An intake air preheating is not required and not installed.
The entire motor is controlled and surveyed by the ECU (Electronic Control Unit). Standard is a
redundant second ECU, battery and fuel pump and is installed as a redundant system.
During the use of the motor following data and information are constantly collected, analysed and
interpreted by the ECU
• Throttle valve position
• Intake air temperature
• Crankshaft position analogue
• Crankshaft position digital
• Air pressure
• Cooling liquid temperature
• On-board power supply voltage
• RPM
• Lambda probe values
If one of the sensors fails, the ECU change into a standard or emergency program, in which the motor
continues to run, but eventually with less power and increased consumption. The ECU signalizes its
status by means of LEDs on the ECU Casing, or optionally by means of a separate monitor.
As the option of a redundant system is installed by default(by the ECU, Battery and Fuel pump, etc.)
the redundant systems controls themselves reciprocally. The full operation is still assured if one
circuit fails totally.
Due to the sidesteered design of the motor, some motor failures (for example valve tearing) wouldn’t
stop the motor to work. Inflight even a loss of one or two cylinders can be compensated and the
motor continues to run with less power, which enables to initialize a safety landing.
The power supply is very important for a safe operation of the motor. Should the generator fail and
the battery is not charged sufficiently anymore, the motor continues to run only until the minimum
power supply voltage of 8V is reached.
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