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To the right of the value of the transmitter's received pulse width values are displayed from 0
to 100%. This value must correspond to the relative position of the throttle stick, matching 0%
to the lowest stick and trim position and, 100% to the stick and trim maximum position. If
these values were not reached, or the limits of the 0 or 100% were reached before pushing
the stick to the end of its travel, the calibration process must be repeated.
4.8.2 Throttle Curves
By default the POWERPACK / ECU controls the RPM in linear way i.e., at the half stick
position the engine turns at half of the rotor RPM range. Jet engines develop the thrust in
exponential mode, thus half RPM means approximately 1/4 of thrust. On small engines with a
high idle to full power RPM ratio, or in a high drag/low power planes, often only the last 1/3 of
the throttle stick produces significant thrust, with the low half stick travel being not used.
Although that with current digital TX the pilot can modify the throttle curve to suit its needs,
from version 5.48 three throttle curves have been added to simplify the setup for most of the
installations:
FULL EXPO: Means linear RPM, it is the default setting and
the mode used for all previous software versions. Thrust
develops exponentially, and it is the recommended curve for
big engines and/or high thrust/weight ratio planes, as it eases
the control in low power used during taxi.
LINEAR:
Means that the thrust develops linearly with the
throttle settings. It could cause difficult taxi, as it would be
difficult to fine adjust the power at low settings.
HALF EXPO: An intermediate setting between the other two
modes.
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