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“smooth,” creating a more equal throttle servo movement during the entire
throttle curve range.
Pitch Curve
Adjustment of the pitch curve is very similar to the throttle curve adjustment
described in the preceding section. A thorough understanding of the throttle
curve section will make pitch curve adjustment easier to understand. The
PCM9X offers six (6) independent types of pitch curves: Normal, Stunt 1,
Stunt 2, Stunt 3, Stunt 4 and Hold. Each pitch curve contains seven (7)
adjustable points — L, 1, 2, 3, 4,5 and H.
Note:
When setting pitch curve for
throttle hold, it is necessary for the throttle hold to be active — if this function
is inhibited, the throttle hold pitch curve will not be visible on the screen.
Revolution Mixing
The Revolution Mixing Function mixes tail rotor input with the Throttle /
Collective Function to counteract torque from the main rotor blades. When
set-up correctly, the helicopter should climb and descend without a tendency
to yaw in either direction. Because torque reaction varies with different power
settings, it is necessary to vary the tail rotor pitch at the same time. The
PCM9X offers two (2) separate revolution-mixing programs with independent
up and down mixing for each — one for flight mode position N and the other
for Stunt 1, 2, 3 and Stunt 4 positions. The U, or Up, mixing adjusts the tail
rotor compensation for the mid to high throttle/stick setting, and the D, or
Down, mixing adjusts the tail rotor compensation for the mid to low throttle
stick setting.
Note:
This function should not be used with a gyro in heading hold mode.
Setting Up Revolution Mixing
First, adjust the helicopter so that it will hover in a neutral position with the
tail rotor trim at centre. Next, establish the helicopter into a stable hover; then
steadily increase the throttle to initiate a stable climb. The body of the
helicopter will move in the opposite direction to the main rotor rotation.
Increase the U, or Up, setting until the helicopter will climb with no tendency
to turn or rotate. At a safe altitude, close the throttle and the helicopter will
descend with the body turning in the same direction as the main rotor.
Increase the D, or Down, mix until the helicopter descends with no tendency
to turn or rotate. When attempting this procedure, throttle stick movements
should be slow, and the initial acceleration and deceleration swings should be
overlooked.
