Alexander Martin Lippisch (November 2, 1894 - February 11, 1976) was a German pioneer of aerodynamics. The "Aerodyne" was the most interesting of his concepts: Theoretically, it would be able to outpace most conventional aircraft with the same weight/power ratio. The Aerodyne's lift and propulsion were to be generated by two co-axial shrouded propellers, the slipstream from which would be deflected downward by "flaps" for vertical take-off and landing. Control was to be achieved by deflecting part of the slipstream emerging from the end of the tail boom, and by flaps in the propeller slipstream. An experimental aircraft for 1968.