I'm medically grounded so decided to learn to fly RC helicopters. Not the coaxial-rotor toy things from Maplin - the heli I usually fly, a Trex 450, has a carbon fibre frame & blades with a tip speed well in excess of 200mph.
I can't fly it like this guy can though....
YouTube - Bert Kammerer Align T-Rex 450 SPORT
PPD