The Darmstadt D-29 was a German experimental monoplane designed and built by Akaflieg Darmstadt (of the Darmstadt University of Technology). The D-29 was a cantilever low-wing monoplane designed and built during 1936 with a conventional landing gear with a tailskid. It was powered by a Siemens-Halske Sh 14a radial piston engine and had enclosed tandem cockpits, as well as a number of other features, including hydraulically actuated trailing-edge flaps, a braced T-tail and leading-edge slots.