Boats How to trim transmitter for ballance rudder or servos

[nayay]

Dear friends,
I have a problem with steering my UDI001, When turn left the rudder move about 45 degree but when turn right the rudder just move a little bit about 15 degree.
Any suggest for setting the steering action so i can get ballance of turn right and left.
Tanx for any suggest.

 

[Lee]

Sounds like you need to centre the servo.
Is the servo arm at 90º to the body of the servo, when powered up?
If not remove the arm, and replace at 90º. If you can't get it 90º, then as close as possible.
Then use trim to finish the job.
Then make sure the rudder is straight.
You can adjust the length of the control rod to do this.