NO engine is meant to be crashed!!! I've seen 3W and DA150's bend the crank snout from a ground strike with a CF prop, yet I've also put a 3W100 through a tree in a crash so violent that the mufflers were RIPPED off the bolts (still threaded into the cylinders) and the prop and spinner were disintegrated, yet no damage was done to the engine itself.

Best bet. . do NOT expect an engine. .ANY engine, to have "crash survivability" built into it. It's like trying to make a plane crash-worthy. Just is NOT going to happen.

I've been using BME's for over 4 years now. . never bent a crank, damaged a bearing, or had a mechanical problem. But then, I've never run one into a brick wall, either