The all-wing experimental Lippisch Delta V, or DFS-40, was test flown by Heini Dittmar at the DFS in Darmstadt in 1939. According to Alexander Lippisch, it demonstrated remarkable performance. This all-wing 39ft span aircraft was powered by a 100hp Argus pusher engine,

The DFS 40 “Delta V” was lost during the summer of 1939 after pilot Rudolf Opitz lost control of it in an unintentional spin. Opitz bailed out successfully but the DFS 40 was written off.