The Focke-Wulf Triebflügel, or Triebflügeljäger, literally meaning "thrust-wing hunter", was a German concept for an aircraft designed in 1944, during the final phase of World War II, as a defence against the ever-increasing Allied bombing raids on central Germany.

It was a vertical take-off and landing tailsitter interceptor design for local defense of important factories or areas which had small or no airfields.

It had no wings, and all lift and thrust were provided by a rotor/propeller assembly 1/3 of the way down the side of the craft (roughly halfway between the cockpit and tailplane).

[3] A cruciform empennage at the rear of the fuselage comprised four tailplanes, fitted with moving ailerons that would also have functioned as combined rudders and elevators.

Four small castoring wheels on extensible struts were placed at the end of each tailplane to steady the aircraft on the ground and allow it to be moved.

The rotors continued spinning in level flight, maintaining 220 rpm at the aircraft's maximum forward speed.

In the 1950s, the US built prototype tailsitter aircraft (the Lockheed XFV, and Convair XFY Pogo), but these were powered by conventional turboprops, with nose-mounted contra-rotating propellers to counter torque.