F450 clone with Copter 3.2.1.
This was my first flight with a new, heavier battery. I went from 3000mAh to 5000mAh but still secured in the same place.
The quad was in stabilize mode, and heading back towards me at some speed, at an altidude of around 15 to 20 meters or so. When I attempted to stop the quad for landing, I think somehow it flipped inverted and all the motors stopped running. It then just fell like a stone to the ground. The battery was ejected on landing which is why the dataflash log is truncated.
I think I was lucky to get away with just 2 broken arms and 2 broken props, but I’d appreciate it is someone could take a look at the log to see what might have happened!