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Throttle curves (TurboProp)
The ECU controls the RPM in linear way, i.e., at half stick position the engine produces power at half of
the RPM range. However, jet engines develop shaft power in exponential way, meaning half RPM means
approximately ¼ of shaft power.
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 produce significant power, with the low half stick travel being not much
used.
Although with current digital TX the pilot can modify the throttle curve to suit needs, three throttle curves
have been added to simplify the setup for most of the installations.
These curves are selected under the RADIO menu:
FULL EXPO: Means power is linear to RPM, it is the default setting. Power develops exponentially, and
it is the recommended curve for high power/weight ratio planes as it eases the control in low power used
during taxi.
LINEAR: Means that the power develops linearly with the throttle setting. 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.
Throttle stick position chart
MODE
0% (Idle)
FULL EXPO
Idle thrust
HALF EXPO
Idle thrust
LINEAR
Idle thrust
Throttle curves can be changed while the engine is running, so you can leave the throttle at a given
position and switch between the curves to see the difference.
Acceleration and Deceleration settings
In the "RUN" menu it is possible to change the acceleration and deceleration settings. The engine is
supplied and tested from factory ready to use and usually these settings should be correct for normal
use. However the user can modify these default settings to allow the engine to run optimally in different
conditions.
On Heli and TurboProp engines, acceleration setting are set to AUTO which gives the engine a good
response but tries to minimise the risk of over-fuelling in a sudden acceleration. In AUTO mode, the ECU
adjusts itself for optimum running at the current ambient conditions reported by the sensors built into the
Hub, and in extreme cases it also raises the idle speed accordingly.
Leave always your ECU in AUTO for optimum trouble free performance.
Stick
Position
25%
50%
6%
25%
16%
38%
25%
50%
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75%
100%
56%
100%
66%
100%
75%
100%
% of total thrust
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