• Revo. mixing rates are 5-point curves. For a clockwise-turning rotor, the rudder is mixed in the clockwise direction
when collective pitch is increased; for counterclockwise-turning, the opposite. Change the operating direction setting
by changing the signs of the numbers in the curve from plus (+) to minus (–) and vice versa. Suggested defaults:
• Clockwise rotation: -20, -10, 0, +10, +20% from low throttle to high.
• Counterclockwise rotation: +20, +10, 0, -10, -20% from low throttle to high.
• Adjust to the actual values that work best for your model.
• Revo. curves for idle-ups are often v-shaped to provide proper rudder input with negative pitch and increased throttle
during inverted flight. (Rudder is needed to counter the reaction whenever there is increased torque. In inverted flight,
throttle stick below half has increased throttle and negative pitch, therefore increasing torque and rotating the
helicopter unless the revo. mix is also increasing appropriately.)
IDLE-UPS: additional flight conditions available specifically for helicopters. These additional flight conditions contain
different throttle curves, collective pitch curves, revo. mixing, and trims (except IDLE-3) to make the helicopter perform
certain maneuvers more easily. Lastly, the gyro and dual rate functions may be set to provide separate rates per condition
selected, including one for each idle-up.
One of the most common flight conditions can easily flip from upright to inverted and back. To do so, the pitch curve is
set to 0 pitch at half stick, positive pitch (climb upright) above half, and negative pitch (climb when inverted) below half
stick. The throttle curve is adjusted to allow the engine to run consistently throughout the changes in pitch.
Additional idle-ups may be used to maximize the helicopter’s flight characteristics in certain types of flight (i.e. fast
forward motion, backward) or maneuvers (loops, rolls, stall turns), or even the same maneuver but changing from heading-
hold/AVCS gyro mode to normal gyro mode. The 9C provides 3 idle-ups to allow the modeler 3 additional setups along
with the normal flight condition. (Note that IDL3 does not include governor settings.)
Adjustability:
• S
WITCH G (9CA) or E (9CH) is programmed for normal (NORM), idle-up 1 (IDL1), and idle-up 2 (IDL2) curves. This
switch/position assignment is not adjustable.
• Activated with the throttle curve for that condition in THR-CURVE.
• Curves are adjusted to maintain constant RPM even when the collective pitch is negative (inverted).
• Note that REVO. mixing has one curve for idle-ups 1 and 2 and a second curve just for idle-up3.
• Gyro settings may be set separately for each idle-up. (See p. 89.)
• Governor settings may be set up to follow Normal/Idle1/Idle2, but do not offer a setting to adjust for each of the 5
conditions like gyro. (See p. 89.)
• Activating OFFSET makes the T
RIM LEVERS adjust the trim separately in each of the idle-up conditions.
For an example of throttle and pitch curves and revo, please see Normal Flight Condition Setup, p. 81.
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