Roche et Laborde

   E Roche and F Laborde designed and built what may be the only true tandem delta monoplane in the history of aviation: it was tested unsuccessfully on the parade ground at Cercottes, near Orleans, c 1910. A large open box-like frame sat on 4 wheels, 2 at each end: in the middle of the box near the front was a Gnome driving 2 counterrotating tractor propellers on outriggers on each side through chains. Fore and aft of the box were the 2 V-shaped horizontal surfaces, each with a triangular fin underneath. The front surfaces were set at c 10° incidence, possibly hinged at the trailing edge to allow variations down to 0°.