[Machine Translation] In December 1937, after the Type 97 Nakajima fighter (Ki-27) was formally adopted, the Army ordered Nakajima Corporation to develop a prototype of the next fighter (Ki-43). The first prototype was completed in December of the following year, and test flights showed that although its maximum speed was 30 km/h faster than that of the Type 97 fighter, its mobility was inferior and it lacked power as a next-generation fighter. Various modifications were subsequently made, including changes to the wing area and replacement of the engine, and by September 1940, 13 aircraft (3 prototypes and 10 additional prototypes) had been completed, but they failed to convince the military, which was focused on combat warfare. However, at that time, the General Staff believed that a fighter with a large range to support the fleet was necessary for the invasion of Singapore, and the Ki-43, which was on the verge of being labeled a failure, found a way to be used as a long-range fighter. In April 1941, a modified version was tested, and since it had the required cruising capability and was superior in vertical combat, it was formally adopted as an all-in-one fighter in May 1941, and from June to August of the same year, approximately 30 Type I aircraft were received by the 59th squadron. The Hayabusa I was deployed mainly in the Burma area and contributed greatly to the initial success of the war. The Type I fighter II was equipped with a Ha-115 engine, a refined fuselage design, and improved performance. When the Type II was deployed in combat, it fought with superiority against the Buffalo, Hurricane, P-40, etc., but had a hard time against the later Spitfire and P-38. However, it was the easiest to handle among the Army's fighters at the time, and its operating rate was high, so it continued to be mass-produced until the end of the war. (Actual aircraft data) Crew: 1, Overall width: 10.84 m, Overall length: 8.92 m (horizontal attitude), Overall height: 3.27 m (horizontal attitude), Wing area: 21.4 m2, Overall weight: 2,590 kg, Engine: Nakajima Ha-115, Lift-off power: 1,120 hp, Maximum speed: 515 km/h/6.000 m, Armament: 12.5 kg Armament: 12.7mm machine gun x2 / Number of parts ... 94