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9.4 Power control
The turbine power is controlled automaticly by the governor system of the turbine; by the
transmitter you only select the desired main rotor speed in a range between 1150 ... 1260 Upm.
All the turbine control functions are executed by a single channel which is controlled by a slider
if things shall be kept simple:
• OFF
• Standby
• Start
• Leerlauf
• Solldrehzahl
• Auto-OFF
The programming features of today's radios, e.g. mc-22 or mc-24, however, allow to make the
turbine control a lot more comfortable:
• Switch from OFF to STANDBY by the throttle limiter.
• System rpm is controlled by a separate slider beween idle (bottom end) and flight phases
dependant operational rpm (top end).
• The starting procedure is triggered by a separate momentary switch.
• Turbine shut off and cooling down is activated by shutting the throttle limiter.
A programming example for the mc-24 radio of this layout is given as follows:
1. In „helimixer" menu set the end points of the throttle curve to „0" to make the curve a
horizontal strait through the zero point.
2. In „stick setup" menu switch off the trim of the throttle/collective pitch stick.
3. In the „controls" menu assign the control for the throttle limiter (slider or 3-pos.-switch).
4. In the „controls" menu assign the slider for the rotational speed setting to the „throttle" port
(6), reduce the throw to +50% symmetrical, shift up the center position to +50%, and give it 5
seconds slow down time in both directions.
5. Assign the momentary switch (turbine start) to the input of a free mixer; ist output is assigned
to „6" (throttle). Setup the mixer gain asymmetrical to -100% (switch activated) and 0%
(switch released).
If you like to have different operational rpm depending on the flight phases you can adjust this in
the „controls" menu by changing the throw for the rpm-slider's top end (port 6) serarately for
each flight phases.
9.5 Further setup
1. Servo direction
Set the „sense" (direction of rotation) of all servos as stated in the instructions. Check the
throttle servo in particular!
2. Dual Rates
You can set switchable travels for roll, pitch-axis and tail rotor. As a starting point we re-
commend 100% and 75% as the two settings.
3. Exponential
For the basic set-up you should leave all control systems set to „linear".
4. Servo travel centre offset
Do not make any adjustments to this point. At a later stage you may wish to make minor
corrections here.
5. Servo travel adjustment
This is where you can adjust the maximum servo travel. Note that the travels should always
be the same on either side of neutral, otherwise you will end up with unwanted differential
effects:
For the swashplate servos (collective pitch function) it is important to check that servo travels
with model turbine engine
bottom end
mid position
top end
mid position again
mid position ... to end
bottom end
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Helicopter mechanics
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