There are a number of cameras coming to market that will be able to automatically edit video. They run continuously and detect when something interesting is happening, then edit out the rest. You can also talk to them while recording to make sure they save a key moment. This one looks promising. I ordered one and will give it a try.

http://getgraava.com?ct-referral-code=VmJqzN8r

It also does hyperlapse, which can make fast-forward sections of the flight appear super smooth.

It can also use a heart rate sensor to decide how to edit the video. That will make sure your crash footage is saved.