Russina naval helicopter. Designed by Nikolai I. Kamov or V.A.Glushenkov. First flew in 1961. Featured the characteristic co-axial rotor design of Russian military helicopters. Used either in anti-submarine warfare roles, with radar, dipping sonar and a towed MAD ('A' variant) or in a OTH missile guidance role with just a radar ('B' variant). Armed with torpedoes or nuclear depth-charges.
NATO designation: Hormone.
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