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Radio and Control Linkage Setup For Raptor 50
4. Tail Rotor Control and Gyro Setup
The radio setup for using a heading hold gyro and a non-heading hold gyro will be different. But the
mechanical setup will be the same.
Heading Hold Gyro Setup: Set the tail rotor mixing or revolution mixing values to zero for every throttle
mode in the transmitter. Leave the tail rotor stick in the center and move the tail rotor trim on the
transmitter to the center. Attach the servo arm so the arm is straight up. Mount the steel ball 10 to 12 mm
from the center of the servo arm. Attach the tail rotor pushrod rod. The pushrod will require a small 15
degree bent to give a smooth run. See the 3-D setup drawing. Adjust the pushrod rod ball links so the tail
rotor rotor blade angle is approximately 15 degree. Check the tail rotor control direction: a right tail rotor
command should increase the tail rotor blade pitch angle. A left command reduces the angle. Leave the
tail rotor control channel ATV at 100%. Use the hand and rotate the gyro to the left. This should cause the
servo to provide a right tail rotor command (increases the tail rotor blade pitch angle). Rotating the gyro to
the right should cause the servo to provide a left tail rotor command (reduces the tail rotor blade pitch
angle). If the gyro is providing the wrong feedback, then the gyro needs to be mounted upside down.
Some gyros have a reverse switch on the gyro box. Never use any tail rotor trim when using a heading
hold gyro, that causes the gyro to drift.
Non-Heading Hold Gyro Setup: Leave the throttle stick and tail rotor control stick in the center and move
the tail rotor trim on the transmitter to the center. Attach the servo arm so the arm is straight up. Mount the
steel ball 10 to 12 mm from the center of the servo arm. Attach the tail rotor pushrod rod. The pushrod will
require a small 15 degree bent to give a smooth run. See the 3-D setup drawing. Adjust the pushrod rod
ball links so the tail rotor rotor blade angle is approximately 15 degree. Check the tail rotor control
direction: a right tail rotor command should increase the tail rotor blade pitch angle. A left command
reduces the angle. Leave the tail rotor control channel ATV at 100%. Use the hand and rotate the gyro to
the left. This should cause the servo to provide a right tail rotor command (increases the tail rotor blade
pitch angle). Rotating the gyro to the right should cause the servo to provide a left tail rotor command
(reduces the tail rotor blade pitch angle). If the gyro is providing the wrong feedback, then the gyro needs
to be mounted upside down. Some gyros have a reverse switch on the gyro box. Go to the tail rotor
revolution mix function in the transmitter. Put in a numerical value of +25 for the high end revolution
mixing and -30 for the low end revolution mixing. Move the throttle stick to the high position and you
should see the tail rotor servo move and "increase" the tail rotor blade angle from 15 degrees to about 25
degrees. Move the throttle stick to the low position and you should see the tail rotor servo moves and
"decreases" the tail rotor blade angle from 15 degrees to 0 degrees. This is to compensage for the
change in torque on the helicopter fuselage when collective pitch is changed. A heading hold gyro does
not need tail rotor revolution mixing because it automatically senses heading changes and feed in
commands to lock on the helicopter heading. A non-heading hold gyro can only stabilize the rate that the
helicopters nose is rotating.
For 3-D flying with a non-heading hold gyro, it will be necessary to put in a V-shaped tail rotor mixing
curve. Try +15 for the high end revolution mixing and -15 for the low end revolution mixing.
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