Bensen B-6 rotor kite.




Previously:

Personal air landing vehicle gyrocopter - GIF
Focke-Achgelis Fa 225 rotary wing glider - photo
Sikorsky-Boeing SB-1 Defiant helicopter - GIF
Folding portable helicopter - photos
QH-50 Dash anti-submarine helicopter - photo
Helicopter with intermeshing rotors - GIF