[Someone]

OK. Let me question myself, then :-) . Energy-wise, I still think it is easy to flip a plane in a crash. I would only call it cartwheeling if there were two flips in succession. That would be tight, as the impact on the ground after the first flip would be quite inelastic.

Also, for both flips, you would have to have the mass of the plane straight behind the pivot point. That is hard to achieve, as everybody who has done cartwheels will know (if not, imagine maiign a handstand on one hand with too much rotation that continues into a landing on one leg)