I have an hexa with AIOP V2, and multiwii 2.2
( 12x38 props, and 25Amp Simon K ESC's)
I made PID triming in accro mode and it flies very well (very rapid stabilisation due to Simon K esc: P parameter can be increased)
But when I touch the ground "strongly", the hexa goes in oscillations (quiet slow oscillation, not same than "Main" PID regulation which is very fast) stronger and stronger then crash.
I wonder if it not due to the sensors or other multiwiiconf parameters, because I changed in many ways PID settings (I down or up, idem for D) and this oscillation when touching ground with energy remains.
Thanks for your suggestions,