Troubleshooting; Replacing The Blades; Fine Tuning Of Yaw Control - Merlin POLARIS 400CP Instruction Manual

Helpful Information

Troubleshooting

Problem
Unit does not operate
Main motor does not turn
Helicopter spins uncontrollably
Helicopter will not hover still when sticks
are neutral
Vibration

Replacing the Blades

Your Tracer helicopter is supplied with a spare set of replacement blades in the event of crash damage. Should you need to replace the blades
please follow these simple steps :-
1. The blades are fastened with a screw and can be removed very easily
2. Loosen the screw on the damaged blade and remove it allowing the
blade to come off
3. Insert the new blade into the gap noting the direction and pitch of the
Flybar Paddles and replace the screw tightening only sufficient to make
sure the blade still moves freely.

Fine Tuning of YAW Control

The controls are pre set in the manufacture and test flying of your helicopter and should not need adjustment. However for tuning by experienced
pilots or in the event of a serious crash and the need to re-build your helicopter their adjustment and function is as follows :-
Left/Right Bias – Is used to obtain a balanced feel between left and right tail rotor inputs. The
adjustment is very sensitive so only make small changes. Turn clockwise to increase the left tail
rotor bias.
Gyro Gain – Turn clockwise to increase gain. Typically too little gyro gain causes the tail to
slowly move around and drift. With the gyro gain too high, you will notice a very fast oscillation in
the tail known as "wag." This adjustment is not very critical so please don't spend a lot of time
trying to get "the best" setting possible.
Tail Rotor Trim – If the helicopter wants to drift one direction in a stable hover then try using this adjustment .The adjustment is very sensitive so
only make small changes. Turn clockwise to add right tail rotor trim.
Receiver and Servo Wiring
Under normal circumstances there should be no need to
unplug any of your receiver wiring, however for reference
purposes the receiver is wired as follows.
Cause
Transmitter "AA" batteries are depleted or
installed incorrectly, indicated by a dim or
unlit LED on transmitter or the low battery
alarm.
No electrical connection.
4-in-1 unit not operating correctly
Gyro gain is incorrectly setup
Trimming incorrect or swash plate is not
level
Bent main shaft
Blades are broken
7
Solution
Check polarity installation or replace with
fresh "AA" batteries.
Push connectors together until they "click."
Consult your retailer
Adjust Gyro gain to 90%
Adjust trim levers or adjust Swash plate
Replace main shaft
Replace blades