Altitude increase without input after takeoff

ArduCopter Copter 4.0
1

Hi all

After a smooth takeoff, craft is hovering about 1 meter. Then after about 3 seconds it will climb without input to a higher alt and then hover there normally.

I have pilot_tkoff_akt set to 0

2

Log or did not happened :slight_smile:

3

Turn on ground effect compensation and try to fly again, it might be that!