The Mitsubishi Shūsui (秋水, Sharp Sword), naval-designation J8M, army-designation Ki-200, is a World War II rocket-powered interceptor aircraft designed and produced by the Japanese aircraft manufacturer Mitsubishi. It is closely based on the German Messerschmitt Me 163 Komet. The name Shūsui literally translates to "Autumn Water", but is used as a poetic term meaning "Sharp Sword" deriving from the swishing sound of a sword. The J8M was developed as a joint project for both the Imperial Japanese Navy Air Service (JNAF) and the Imperial Japanese Army Air Service (JAAF), which sought to counter the growing threat of Allied strategic bombing of Japan. Originally, the J8M was intended to be a straightforward licence-built copy of the Me 163, however, difficulties in shipping an example and associated materials to Japan led to an effort to reverse engineer the aircraft from a flight operations manual and other limited documentation that had arrived. Starting in 1944, Mitsubishi's design team, headed by the aeronautical engineer Mijiro Takahashi, closely coordinated with the First Naval Air Technical Arsenal to design the airframe. Multiple companies, including Nissan and Fuji, were involved in the manufacturing effort. During December 1944, an unpowered glider, the Yokosuka MXY8, flew to successfully validate the J8M's handling characteristics. Development was not straightforward, as the JNAF continuously requested design changes while the expedited production schedules overwhelmed some of the manufacturing partners, with readiness for full-scale production not being attained until the final weeks of the war. A single powered prototype was completed and made its maiden flight on 7 July 1945, only weeks prior to the Surrender of Japan that ended the conflict. No operational missions were ever flown. Two examples were transported to the US for evaluation, one of which was preserved and put on public display.
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