ĭespite the Armistice, development continued, with a significantly revised third prototype being built by the Société nationale des constructions aéronautiques du Sud-Est ( SNCASE) at Marignane, the HD.731.01. These plans were stopped by the French surrender in June 1940, with the two prototypes being stored. Testing showed that it was underpowered, and it was proposed that the planned 40 production aircraft would be use a 261 kW (350 hp) Béarn 6D. The first prototype flew in February 1940, with the second following in May. It was powered by a single 164 kW (220 hp) Renault 6Q inverted six-cylinder air-cooled piston engine driving a two-blade propeller. The observer was armed with a single flexibly mounted machine gun, and a fixed machine gun was operated by the pilot. The two-man crew of pilot and observer sat in tandem under an enclosed canopy. It was fitted with an inverted gull-wing, which folded immediately outboard of the twin floats to aid storage on board ship, and it had twin tail fins. It was a low-wing monoplane of all-metal stressed-skin construction. The Dewoitine HD.730 was designed by Emile Dewoitine's team at the Société nationale des constructions aéronautiques du Midi ( SNCAM), which was formed in 1937 when Dewoitine's Société Aéronautique Française was nationalised, in order to meet a French Navy requirement for a light catapult-launched observation aircraft, with two prototypes ordered in 1938. Two flew in 1940, and a third aircraft was built to a modified design in 1941, but no production followed. It was a single-engined, low-wing monoplane that was designed as a catapult-launched reconnaissance aircraft to operate from warships of the French Navy. The Dewoitine HD.730 was a prototype French reconnaissance floatplane of the 1940s.
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