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.

During 1909 and 1910 Camille Contal of Mourmelon, France, the inventor of a three-wheeled car called the Mototri, built several monoplanes. The 1910 machine had a narrow triangular fuselage was covered with sheets of mahogany with a 50 hp Gnome overhung at the nose. The rectangular wings could be warped, with the front spars fixed through steel fittings to the top two ash longerons, and the rear spars hinged. The pilot sat with his legs extended so that he could set his back easily against the seat without having to be strapped in.