Quoting Smithsonian National Air and Space Museum | Aichi M6A1 Seiran (Clear Sky Storm): Aichi chief engineer, Toshio Ozaki, designed the M6A1 Seiran to fulfill the requirement for a bomber that could operate exclusively from a submarine. Japanese w This Vertical Jump program is a little known multi-faceted vertical jump training program that provides trainees with all the
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Aichi M6A Seiran. The new submarines and aircraft were assigned to the Japanese Imperial Navy's 1st Submarine Flotilla, comprising the two STo submarines, the I-400 and the flagship I-401, each carrying three Seirans together with two type AMs, the I-13 and I-14. The 1st Submarine Flotilla commenced training with the Seirans in January 1945, the crews gradually learning how to handle the submarines and aircraft.
The last surviving Aichi Seiran Japanese Seaplane on display at the Smithsonian Udvar-Hazy Museum near Washington, DC.
Aichi M6A Seiran. The flotilla departed Japan on 23 July 1945 and proceeded towards Ulithi. However, on 16 August, the flagship I-401 received a radio message from headquarters, informing them of Japan's surrender and ordering them to return to Japan.
The Aichi M6A Seiran (晴嵐?, "Clear Sky Storm" or "Mist on a Fair Day") was a sub-launched attack floatplane designed for the Imperial Japanese Navy during World War II. It was intended to operate from I-400 class submarines whose original mission was to conduct aerial attacks against the United States. The first of 8 prototype Seirans was completed in Oct 1943, commencing flight testing in November that year. Further testing was sufficiently successful for production to start in early 1944.