In the 40's and 50's, the Russians were able to make small helicopters using motorcycle engines. But in early 70's, Kamov was tasked to make a helicopter that can be launched from a submarine torpedo tube (the helicopter fits inside a 500mm tube). So, they created this.
https://twistairclub.narod.ru/ka56/indexengl.htm
(REPOST)
#Ka-56
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