--In 1936, the Navy ordered the prototype of the 11th test ship bomber to be made by three companies, Aichi, Nakajima, and Mitsubishi, but Mitsubishi abandoned development on the way, so two companies, Aichi and Nakajima. The development of the prototype was competed in.
--At Aichi, all-metal low-wing monoplanes, the plane shape of the main wing and tail wing adopted aerodynamically excellent elliptical tapered wing, the main landing gear was fixed with an emphasis on practicality, and the lower surface of the main wing was equipped with a dive braking plate The aircraft was developed and the prototype flew for the first time in 1938.
――In the subsequent flight test, problems such as sudden rotation that started to roll over and the weight of the elevator took time to repair, but because the speed and maneuverability were superior to the rival Nakajima aircraft, 1939 (1939) It was officially adopted as the Aichi D3A bomber type 11 (D3A1), and its success in bombing, which boasted a high hit rate in the early stages of the war, was remarkable.
