MacGregor Industries
27 HELI
Connect the white connector from the G490T to the AUX2 channel of the receiver, and the black connector to the Rudder
channel.
The G490T set-up is a little more difficult to understand when using the "GYRO GAIN" feature of the PCM9X2.
Transmitter gyro gain settings between 50% and 100% adjust the heading hold gain with 50% transmitter gyro gain
corresponding to zero heading hold gyro gain and 100% transmitter gyro gain corresponding to 100% heading hold gyro
gain. A 1% INCREASE in transmitter gyro gain gives a 2% INCREASE in heading hold gyro gain.
Transmitter gyro gain settings between 0% and 50% adjust the rate (normal) mode gain with 0% transmitter gyro gain
corresponding to 100% rate (normal) mode gyro gain and 50% transmitter gyro gain corresponding to zero rate (normal)
mode gyro gain. The rate (normal) mode gain of the gyro INCREASES as the transmitter gyro gain setting DECREASES!
A 1% DECREASE in transmitter gyro gain gives a 2% INCREASE in rate (normal) mode gyro gain.
If you have a digital or super servo, set the standard/high rate switch on the gyro to the high position to take advantage of
the superior performance. Standard servos require the switch to be in the standard position.
Cyclic to Throttle 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 "MIX->THRO" menu choice and click the Scroll Bar.
The PCM9XII's Cyclic-to-Throttle function is designed to correct any under-speeding or over-speeding of the main rotor
due to load changes placed upon the engine when an Aileron, Elevator, or Rudder control is given. By using the Cyclic-to-
Throttle mixing, the main rotor RPM can be held at a constant value throughout aerobatic and 3D manoeuvres.
If a Governor is used for Rotor speed control, the Cyclic-to-Throttle Mixing is unnecessary and should not be
activated.
During 540 stall turns and fast pirouettes, the tail rotor absorbs power and the Main Rotor speed tends to decay. This can
be prevented by adding a Rudder to Throttle (RUDD->THRO) mix. A good starting value would be +15% for R (right
mixing) and -10% for L (left mixing). A positive value increases the Throttle; a negative value decreases the Throttle.
When doing a roll, flip, or other manoeuvre employing large cyclic inputs, the Elevator to Throttle (ELEV -> THRO ) and
Aileron to Throttle (AILE -> THRO) mix can be used to prevent Rotor Speed decay. A good starting point is between
10% to 30 % in each direction for both Aileron and Elevator. A positive value increases the Throttle; a negative value
decreases the Throttle.
Summary of Contents for PCM9XII
Page 1: ...MacGregor Industries MACGREGOR INDUSTRIES Instruction Manual PCM9XII ...
Page 4: ...MacGregor Industries This page is intentionally blank ...
Page 43: ...MacGregor Industries 39 HELI ...
Page 65: ...MacGregor Industries 61 AERO ...
Page 85: ...MacGregor Industries 81 GLIDER ...
Page 86: ...MacGregor Industries This page is intentionally blank ...
Page 87: ...MacGregor Industries This page is intentionally blank ...