Hanriot H.31

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The Hanriot H.31 was a French single-seat fighter built in 1925 to take part in a government competition for 400–500 hp engines. Only one prototype was completed. It used a 370 kW Salmson 18Cm engine and was a single-engine, single-seat biplane with a fixed undercarriage and an open cockpit. The wings were of a simple biplane setup with some sweep and cut-outs for better pilot visibility, and the engine was closely cowled with a ventral radiator for cooling.

The H.31 was shown to the public at the Paris Air Show in December 1924 and flew for the first time in 1925. In the competition, it was one of the heaviest and slowest designs, especially in climbing, and it did not win. The NiD 42 was the winner, and the H.31 project was abandoned.