 In World War II, Weserfulg in Germany came around 1938 up with the concept of their P.1003/1, which was tilting to the top with part of the wings but not the full wings, so it may be inbetween tilt-rotor and tilt-planes.Shortly after a German prototype, the Focke-Achgelis Fa 269, was developed starting in 1942, which was tilting to the ground, but never flew.Platt and LePage patented the PL-16, the first American tiltrotor aircraft.