Guy replaces wing and propellor with an entirely new method of using a horizontal axis fan instead aerofoil wing. A little clumsy looking as a prototype, but given the years since the airplane was invented - quite impressive to invent something new other than propellors.

"One of the few truly new aircraft since the Wright Brothers" Clive Thompson, New York Times

Skip the talking, jump to 2:30 to see it in action.