Human Powered Helicopter

(from)

Fairly impractical… and it’s hard to believe it’s real… the rotors turn so slowly.

Still – there it is. The world’s biggest quad-copter. Personally I think it might be better to sit there riding a bike that winds up a huge rubber-band… and then fly using that… kindof allows you to compress the energy going in. Mind you, when it runs out, you’d come crashing down, so maybe not.