Spektrum SPMAR7100 - Manual (Page 11)

Spektrum AR7100 19 Spektrum AR7100 20
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.
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 RevLimit 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
The RevLimit will pass control back to the throttle channel (controlled
by the throttle curves) if any of the following occurs:
1. The throttle stick (output) is below 25%
2. The Gear channel output is less than 5% (travel adjust or
limiter setting)
3. The rpm sensor fails
The Spektrum AR7100R RevLimit feature employs technology
exclusively licensed to Horizon Hobby, Inc. from Model Avionics.
Calibration (continued) Adjusting Throttle Curves How the Limiter Works (continued)
Fig: Auxiliary Channel ATV to Target Speed.
Example: Engine RPM / Travel Adjust