Mitsubishi J8M 三菱 J8M 秋水 Autumn Water - Sharp Sword - Messerschmitt Me 163 clone - original parts in the foreground
Text on the sign:
"Shu-Sui" (="Autumn Water") is the only rocket-powered fighter ever produced in Japanese aviation history. Its design was originated from the German's Messerschmidt Me 163B. Based on the very limited data, it was Co-developed by MHI and Japanese Imperial Force; airframe by MHI and rocket engine by the Imperial Force. It was capable of reaching the altitude of 34,000 ft. (10,000 meter) in 3 1/2 minutes with maximum speed of 560 MPH (900km/h).
In July 1945, two of "Shu-sui" designed as an interceptor against the B-29 "Super-fortress" were completed after 11 months of production, however, the war ended in August before they saw an actual combat.
One completely intact "Shu-Sui" is preserved and exhibited at the "Planes of Fame Museum" in the U.S. The one you see here was found from under the ground (Kanagawa pref.), and restored by MHI in the year 2000.