The Carmier Simplex 10 hp was a French tailless, low power, single seat aircraft built in 1923 for a contest arranged by a Paris newspaper.
Before World War I René Arnoux designed and built a series of about five tailless aircraft, all but the first being rectangular plan monoplanes with vertical surfaces.
[1] In the early 1920s he continued to explore this layout, though with a changed planform, with a company he had founded that had Pierre Carmier as chair and principal designer called La socièté à "L'avion Simplex".
Conventional ailerons filled the outer two-thirds of the trailing edge and the inner part was occupied by broad chord, elevator-like surfaces with a rudder cut-out.
[2] The Simplex-10 hp's career was brief, for although it began the initial trials of the Petit Parisien's contest in July 1923, piloted by Geogel, it suffered from engine problems and failed to qualify.