The DFS 40 (originally developed as the Delta V) was a tail-less research aircraft designed by Alexander Lippisch in 1937 as a follow-on to his Delta IV aircraft. In construction, the DFS was closer to a flying wing than its predecessor, and was built as an alternative to that aircraft.

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DFS 40
Role	Experimental Tailless aircraft Type of aircraft
National origin	Nazi Germany
Manufacturer	Deutsche Forschungsanstalt für Segelflug (DFS)
Designer	Alexander Lippisch
First flight	1939
Number built	1
Developed from	Lippisch Delta IV
Variants	DFS 194

The DFS 40 was flown for the first time by Heini Dittmar in 1939, shortly before Lippisch departed the DFS (Deutsche Forschungsanstalt für Segelflug - German Research Institute for Sailplane Flight) to begin work at Messerschmitt. Soon afterwards, without Lippisch there to supervise the project, the aircraft was crashed due to an error in center of gravity calculations that resulted in it entering a flat spin during flight.

Specifications (DFS 40)

General characteristics

• Crew: 1
• Length: 5.1 m (16 ft 9 in)
• Wingspan: 12 m (39 ft 4 in)
• Powerplant: 1 × Argus As 8 4-cyl in-line piston engine, 75 kW (100 hp)

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