Amazingly, having done most of my flying in high wing Cessna's, I have not yet bumped my head on a wing or flap. I have, however, had students do so. Nothing hurts more, or causes more damage both to head and to pride, than a lowered flap and the victim gets up under it after picking something up or checking a rivet line.
Now that hurts, and yes, the diamond shaped corrugations in the flaps sure do leave a mark.
I include a warning about this as part of my pax/student briefing.
Be careful out there.
Kermie
