High Quality Content by WIKIPEDIA articles! The Focke-Wulf Fw Triebflügel (Triebfluegel if the ü-umlaut is not used), or Triebflügeljäger, literally meaning "powering wing" or "powered-by-wings fighter", 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 use local defense of important factories or areas which had no or only small airstrips. The Triebflügel had only reached wind-tunnel testing when the Allied forces reached the production facilities. No complete prototype was ever built.