The Kamov Ka-15 (NATO reporting name Hen) is a Soviet two-seat utility helicopter with coaxial rotors, which first flew on 14 April 1952 at the hands of test pilot D. K. Yefremov. It was the world's first mass-produced coaxial helicopter.
The Kamov Ka-15 (NATO reporting name Hen) is a Soviet two-seat utility helicopter with coaxial rotors, which first flew on 14 April 1952 at the hands of test pilot D. K. Yefremov. It was the world's first mass-produced coaxial helicopter.
Source: Wikipedia "Kamov Ka-15" · CC BY-SA 4.0
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