I have a stock CPP with a G90. It worked great for a month until a hit the tail rotor hard enough to tear up the motor. I replaced the motor and it lasted 5 battery packs..it then just got weak and couldn't provide enounh clockwise force on the model to keep a heading any more. I replaced the motor again, and the new one lasted 2 packs before I had the same problem. I had a similar problem on my CP and the replacement tail motor has been working fine for weeks now. Is it possible that I got 2 defective motors ?? The Gyro seems to working fine..I'm just disconnecting the main motor, applying power and twisting the models to test for proper response. Any suggestions would be appreciated. Thanks