Kamov Ka-20

The Kamov Ka-20, given the NATO reporting name Harp, was a Soviet twin-engined prototype helicopter designed and built by Kamov. It grew out of the earlier Ka-15 to meet a 1958 Soviet Navy requirement for a heavy shipborne helicopter to counter United States Navy submarines in the early Cold War. It used twin contra-rotating three-blade rotors and two 670 kW turboshaft engines mounted above the cabin, a layout it was built to prove. It carried no mission equipment or corrosion protection, though it had a nose-mounted radome. It became known abroad at the 1961 Tushino display and led to the Ka-25 family.