An aircraft designed following the ideas a patent of Francois d’Astanières about an automatically-stable monoplane. Built by Louis Clement, it was tested initially in 1913. The aircraft was later modified with some safety features patented by Louis Costantin (concave leading-edge flaps and modified elevators), the then called Constantin-d’Astanieres monoplane took part in the 1914 Concours de Sécurité.
Powered by a fuselage-mounted car engine that drove, via chains, a pusher propeller. The Constantin-d’Astanieres has a fairly orthodox rear fuselage and tail feathers, sles conventional was its additional front elevator on outriggers. The icing in the cake was its “slighty flexible” wings intended to absorb wind gusts.
The d’Astanières autostable in its second configuration, was under test at Bois d’Arcey in May 1913.
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