Glider Thrust Torque Problem

 I have made a balsa glider with following specification:

Aerofoil : Clark X

Dihedral Wing (2m)

Pusher Configuration .

Rudder and Elevator

I m facing a problem of thrust torque , As I increase throttle, bird goes leftwards . So to correct this i trimmed my rudder to rightwards . Now it goes straight in power but as i off the throttle , Bird turns to rightward .And the problem is i have to change its rudder trim according to the throttle level.Kindly suggest me how can i reduce the motor torque effect on my bird.



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