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Futaba 9CHFsuper Manual

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OFFSET: Optional separate trims in addition to those for the normal condition. This function is used to automatically change
the trim of a helicopter, for example, when transitioned from hover to flying at high speed. A clockwise-rotation rotor
helicopter tends to drift to the right at high speed, so an aileron offset may be applied to offset the helicopter to the left.
The necessary elevator offset varies with model geometry, so it must be determined by noting collective pitch changes at
high speed. The rudder offset is affected by both revo. mixing and trim lever movement while in the offset function.
Adjustability:
Complete switch assignability, plus a CONDITION option that creates/switches between individual trims for each of the
idle-ups.
When OFFSET is active (its switch is on), moving the T
RIM LEVERS adjust the stored offset, notthe trims in the normal
condition.
When OFFSET is inactive (its switch is off), the OFFSET and any trim adjustments to it have no effect (model obeys the
trim settings of the currently-active flight condition.)
Defaults to ON.
When OFFSET is inhibited, trim adjustments made in any flight condition affect all flight conditions.
Rapid jumps caused by large offsets can be slowed using the DELAY function.
NOTE: Remember, offsets and revo. mixes are not recommended when using heading-hold/AVCS gyros because they
conflict with the automatic corrections to trim and torque that AVCS provides.
GOAL of EXAMPLE: STEPS: INPUTS:
91
Set up separate trims for each of the
three idle-up conditions.
Adjust the idle-up 2 rudder trim to
correct for torque at high speeds.
Where next?
Open the OFFSETfunction.
Change switch setting to COND
Select IDL2
.
Adjust trim settings as needed. (Ex:
rudder to +8%.)
Close menus and confirm difference in
trims between normal and idle-up 2.
for 1 second.
(If basic, again.)
to OFFSET.
to COND .
to IDL2.
to +8%.
E (9CH) or G (9CA) from
NORMAL to IDL2. Check that rudder
trim changes.
DELAY: see p. 92.
THR-HOLD: see p. 88.
Setting up the Idle-Ups: Throttle and Collective pitch Curves and Revo. Mixing
(TH-CURVE, PIT-CURVE, REVO. MIXING for idle-ups: see p. 90.
*During OFFSET operation, the aileron, elevator, and rudder travels are displayed on each trim display in the Startup screen.
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