MacGregor Industries
25 HELI
Note that an inhibited mix point plays no part in the mixing procedure. This is most noticeable when using the exponential
(EXP) feature to smooth the curve. To activate the inhibited mix points, click on them twice (once to activate and once to
exit). The "hidden" value will appear and the mix point will become active.
The figure to the right of [PIT. CURV] to the top left of the screen indicates the current Flight Mode switch position.
Hovering Pitch Lever
The Hovering Pitch Digital Trim lever only affects the middle three points of the Throttle curve. The Hovering Throttle
Lever shifts the curve upward or downward parallel with the original curve and does not affect the other points.
Press the LIST key to return to the Function Menu. Press the enter (ENT) key to return to the Information Display Screen.
Revolution Mixing
The Function Menu List is accessed from the Information Display Screen by pressing the LIST key. From the Function
Menu List, rotate the Scroll Bar to highlight the "REVO. Mix" menu choice and click the Scroll Bar.
The Revolution Mixing function is designed for use with conventional "Rate" gyros only. When set up correctly, the
helicopter should climb and descend without a tendency to yaw in either direction. The PCM9XII offers two separate
revolution mixing programs, with independent up and down mixing , one for the normal Flight Mode and the other for the
Stunt modes. The U (up) mixing adjusts the tail rotor compensation for the mid to high Throttle setting and the D (down)
mixing adjusts the tail rotor compensation for the mid to low Throttle setting.
Note that this function should not be
used with a gyro in heading hold mode.
Revolution Mix Set-up
Set up the helicopter so that it will hover with the Tail Rotor Trim centred. Establish the helicopter into a stable hover,
then slowly increase the Throttle to initiate a steady climb. The body of the helicopter will move in the opposite direction to
the main rotor rotation. Increase the U (up) setting until the helicopter climbs with no tendency to turn. At a safe altitude,
reduce the Throttle. The helicopter will descend and the body will turn in the same direction as the main rotor. Increase
the D (down) mix until the helicopter descends with no tendency to turn. Throttle stick movements should be slow and the
initial acceleration and deceleration swings should be ignored. Please note that revolution mixing is inhibited when the
Throttle Hold switch is active.
To set a mix value,
highlight the "Up" or "Dn" value by rotating the Scroll Bar and click on it to bring up the sub menu.
The figure is surrounded by a box to indicate that it is selected. Rotate the Scroll Bar to alter the setting. To return the
figures to the default of zero, press the clear (CLR) key at the left hand side of the screen. When the required setting is
achieved, click the Scroll Bar to exit the sub menu.
Press the LIST key to return to the Function Menu. Press the enter (ENT) key to return to the Information Display Screen.
Gyro Gain
The Function Menu List is accessed from the Information Display Screen by pressing the LIST key. From the Function
Menu List, rotate the Scroll Bar to highlight the "GYRO SENS" menu choice and click the Scroll Bar.
The Gyro Gain may be controlled by the Rudder Dual Rate switch or by the Flight Modes (AUTO) and to use this facility,
the Gyro Gain lead must be plugged into the AUX2 receiver channel.
Summary of Contents for PCM9XII
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