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Setting a Target RPM
The Gear channel' s output sets the target rpm. See the diagram below. Note that the
limiter is turned off from 0% to 5% and the target rpm is increased as the travel
adjust/limiter setting is increased. Also note that the rpm increases above and
below 5%. Using the servo monitor is a helpful way of verifying adjustment.
Adjust the gear channel' s travel adjust (DX7) or the limiter program to select the
desired target rpm' s .
Fig: Auxiliary Channel ATV to Target Speed.
Example: Engine RPM/Travel Adjust
Adjusting Throttle Curves
During the initial flights, a slightly elevated throttle curve that will give a headspeed
of approximately 50 rpm above the target rpm is recommended. After operation is
verified, some pilots use a 100% throttle curve in stunt mode and allow the RevLi-
mit to fully regulate the engine rpm. Remember that flipping into normal mode and
low throttle will deactivate the limiter should an issue occur.
How the Limiter Works
The RevLimit waits for the engine to reach the target rpm set by the Gear channel
output. When the target rpm is exceeded, the limiter will smoothly take over the
throttle channel regulating the engine directly. If the rpm drops below the target
speed then normal control will be transferred to the throttle channel.
The RevLimit will only limit the throttle if all of the following conditions have been
met:
1. The rpm sensor, throttle and gear channel are adjusted and operating correctly.
2. The RevLimit has been calibrated.
3. The throttle is above 25%.
4. The gear channel output is greater than 5%.
5. The target rpm has been reached.
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