Hi Guy's. Hope that someone can give me tips on how to solve my strange copter behaviour. I'm running a APM1 in X config. Every time I try to take off, the copter's back left arm (motor 2) stays behind. So I started with the basic stuff, correct motor rotation CW and CCW, correct propeller on each motor, ESC calibration, level procedure, compassmot which is at 10% and finally the vibration which is within limits on all 3 axis. Following on from there I enabled 'motors' in the log, put the copter level and started it. Strange to see that motor 1 constantly gets more juice than the other 3. This could explain the flipping behaviour since moter 1 is opposite to the leg that stays behind. Any ideas for more testing or how to solve this more than welcome. Log file and motors graph attached.
Solved it!! It was the prop that caused the problem. Couldn't see a difference with the other props on the copter but by changing with a spare it made it clear.