boy, I saw a spinner and prop come off a 60 size mustang a couple of weekends back. Hit one of the guys in the shoulder. I suppose he was lucky, it was ugly though. turns out the ding dong only tightened the prop with a pair of pliers. He was a new guy and what he was doing with a Mustang (not a PTS mind you) in the first place was beyond me. I stay 100 feet away from him when his engines are turning now.