Payen Pa 100 series
At the age of 17 Roland Payen filed the patent for both what would later be called the delta wing and the canard foreplane. He then commenced a prolific career from the early 1930's designing primarily radical racing aircraft, but also combat aircraft, civil light aircraft and transports.
The first design to reach the construction phase was the Pa 100, designed for the Coupe Deutsch de la Meurthe race. The race required aircraft to be fitted with an engine of no more than 8 litre capacity, and so the aircraft was to be fitted with a sponsored Regnier R6 engine. However in early 1933 a Regnier representative was shown the airframe and was shocked by just how radical the design was, and cancelled the supply of the engine.
With no engine the airframe was now reworked to take a significantly larger Gnome & Rhône radial engine and rebadged as the Pa 101 "Avion-Flèche
". The larger engine now meant that Payen's aircraft was ineligible to compete in the Coupe, but the aircraft was complete to test fly and validate the aerodynamics of the design. However after only 10 days the aircraft was damaged in a ground accident.
Payen then continued work on a new version as the Pa 110CD (Coupe Deutsch) with a Hirth 508D engine, but the design did not progress due to a lack of funding. Instead the design was reworked to become a fighter as the Pa 110C1 for the Spanish Republicans. As the Spanish Civil War turned against the communists Payen's attention now turned to reworking the design again to become the Pa 112C1 for the French Air Force in 1937.
The Pa 101 airframe was modified to become the mockup for the Pa 112C1, but again the French authorities rejected the design because of the complexity of its twin engines and gearbox system.
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