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 XP7202 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 and Stunt 2 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.
In the Function Mode, use the UP or Down keys to
select Revolution Mixing screen.
Revolution Mixing (only used with non heading hold gyros)
Setting Up Revolution Mixing
First, adjust the helicopter so that it will hover in a neutral
position with the tail rotor trim at center. 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.
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