I have recently installed a pixhawk on my 250 quad, I previously posted about instability but that, I believe, was due to the esc's not the pixhawk. Currently the motors all spin appropriately if I hold the quad and tilt it. However on trying to actually fly the quad it seems insanely unstable and gyrates violently until it flips or crashes. I think this may be to do with the PID settings (overshooting during a transient phase is normally down to too large a value for Proportional gain). Has any one ecountered any thing like this or should I just tinker with PID.
Flight controller - Pixhawk
ESC - QBrain (Quattro) 4 in 1
Motors - DYS BE1806 2300KV
Props - 6*4 (a little large I know)