wrote:

Its true that collision energy is proportional to relative speed
squared. But if on landing you don't collide with anything (or flip
over, etc.) you should have a good chance not getting hurt. Just like
cars spinning out of control, they are ok if they don't bump into
anything - roll over, etc.

Loss of control during takeoff is more problematic. There typically
you don't have room to "slide" on the runway but bump into trees,
housing or whatever.



The othe important facetor is angle of impact...