Rule number one when doing flips with multirotor (quadcopter) drone is to watch your altitude. Specially with bigger machines without big thrust to weight ratio. If you will not control altitude, it might end like that:
Quadcopter (built on Raptile 500 frame and Flip32+ FC) survived without a scratch. Camera (RunCam HD) survived as well. It “only” detached for quadcopter and traveled few meters by itself until landed in grass.