Kamov Ka-15

The Kamov Ka-15, NATO reporting name Hen, is a Soviet two-seat utility helicopter with coaxial rotors that first flew on 14 April 1952 with test pilot D. K. Yefremov. It was the world's first mass-produced coaxial helicopter, entered production in 1956 at aircraft factory No. 99 in Ulan-Ude, and was used for bush patrol, agriculture and fishery control. Soviet Naval Aviation wanted a larger two-seater than the Ka-10 with an enclosed cabin, and the Ka-15 has side-by-side seats in a glazed cockpit, a 255 hp Ivchenko AI-14V radial engine behind it and a twin tail. A civil Ka-15M served with Aeroflot from 1958 for crop spraying, power line patrol, airmail and air ambulance work.