Professor Henrich Focke, through his development of the Fw 186, and through his work on the C.19 and licence-built C.30 autogyros,[REF] came to the conclusion that the limitations of autogyros could be eliminated only by an aircraft capable of vertical flight, the helicopter.
Using rotor technology licensed from the Cierva Autogiro Company, a single radial engine drove twin rotors, set on tubular steel outriggers to the left and right of the fuselage [REF].