The Rikugun Ki-202 Shūsui-Kai (Japanese: 三菱 Ki-202 秋水改, translated as "Autumn Water, improved") was a direct development of the German Messerschmitt Me 163 Komet rocket-powered interceptor aircraft.
A fundamental shortcoming of the Me 163, and all other aircraft based on it, was extremely limited endurance, typically only a few minutes.
The Imperial Japanese Navy proposed to improve the endurance of the J8M1 by producing a version with only one cannon, thereby saving weight and space for more fuel (the J8M2).
Power was to be supplied by a 2,000 kg (4,409 lb) thrust Mitsubishi Toku Ro.3 (KR20) rocket motor.
Data from Japanese Secret Projects:Experimental aircraft of the IJA and IJN 1939–1945[1]General characteristics Performance Armament