ドルニエ
The Dornier Do 29 was an experimental aircraft developed by Dornier Flugzeugwerke and the "Deutsche Versuchsanstalt für Luftfahrt" (German Aviation Laboratory) in the 1950s, used to test a tilting-propeller system for short takeoff and landing (STOL) aircraft. The concept was proved to be successful in flight testing; however, no further development of the system or aircraft was proceeded with, and at the conclusion of its test program the Do 29 was retired.