Maurice Delanne produced his first design, a light aircraft, the D.ll L'bis Bleu, at Chateauroux in 1929. Proposed a tandem wing arrangement (the "Nevadovich biplane") in 1936. Virtues claimed for this arrangement included an exceptional e.g. travel and very low stalling speed. The Delanne 20 research aircraft was built on this principle by the Societe Anonyme Frangaise de Recherches Aeronautiques in 1938. A full-scale fighter design, the Arsenal- Delanne A-D 10, was built by Arsenal de I'Aeronautique at Villacoublay in 1939. Completed during the German occupation, it was taken to Germany for further testing.