Mitsubishi J8M
| J8M | |
|---|---|
 |
|
| Role | Interceptor |
| Manufacturer | Mitsubishi |
| First flight | 7 July 1945 |
| Primary users |
IJA Air Service IJN Air Service |
| Produced | 1944-1945 |
| Number built | 7 |
| Developed from | Messerschmitt Me 163 |
| Variants |
Yokosuka MXY8 Yokosuka MXY9 |
The Mitsubishi J8M Shūsui (Japanese: 三菱 J8M 秋水, literally "Autumn Water", used as a poetic term meaning "Sharp Sword" deriving from the swishing sound swords make) was a Japanese World War II rocket-powered interceptor aircraft closely based on the German Messerschmitt Me 163 Komet. Built as a joint project for both the Navy and the Army Air Services, it was designated J8M (Navy) and Ki-200 (Army).
The J8M1 was intended to be a licence-built copy of the Messerschmitt Me 163 Komet. Difficulties in shipping an example to Japan meant that the aircraft eventually had to be reverse-engineered from a flight operations manual and other limited documentation. A single prototype was tested before the end of World War II.
The Japanese were quite aware of the results of the strategic bombing of Germany, and knew that the B-29 Superfortress would be bombing Japan and the resultant problems which would arise from trying to combat this. Japanese military attachés had become aware of the Komet during a visit to the Bad Zwischenahn airfield of Erprobungskommando 16, the Luftwaffe evaluation squadron charged with service test of the revolutionary rocket-propelled interceptor. They negotiated the rights to licence-produce the aircraft and its Walter HWK 509A rocket engine. The engine license alone cost the Japanese 20 million Reichsmarks.
The agreement was for Germany to provide the following by spring 1944:
The broken-down aircraft and engine were sent to Kobe, Japan in early 1944. It is probable that the airframe was on the Japanese submarine RO-501 (ex-U-1224), which left Kiel, Germany on 30 March 1944 and was sunk in the mid-Atlantic on 13 May 1944 by the hunter-killer group based on the escort carrier USS Bogue. Plans and engines were on the Japanese submarine I-29, which left Lorient, France on 16 April 1944 and arrived in Singapore on 14 July 1944, later sunk by the submarine USS Sawfish on 26 July 1944, near the Philippines, after leaving Singapore.
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