Quadrotor dift in flight

ArduCopter Copter 3.1
1

Hi
I upload 3.1.2 firmware on a 3DR arducopter board. I did all the acc, compass and RC calibration, but the quadrotor always move in a fixed direction without giving any roll and pitch command from RC. I just could have a vertical takeoff by using RC transmitter trim for roll and pitch channel. Does anybody know the reason?
Thank you.

2

[quote=“rdehghan66”]Hi
I upload 3.1.2 firmware on a 3DR arducopter board. I did all the acc, compass and RC calibration, but the quadrotor always move in a fixed direction without giving any roll and pitch command from RC. I just could have a vertical takeoff by using RC transmitter trim for roll and pitch channel. Does anybody know the reason?
Thank you.[/quote]

Use save trim or auto trim: copter.ardupilot.com/wiki/autotrim/

3

I too did that (save trim), but it took a massive amount of trim on an otherwise balanced frame.

Is that normal for APM?