With its unusual rotor arrangement, this helicopter was first seen as a prototype during the Soviet Aviation Day display of July 9, 1961. Two sets of main rotors, operating alternately give the Kamov more lift and make a tail rotor, as used on the Seasprite, unnecessary, The Kamov has been code-named "Hormone" by the West. Its emergency flotation system give the crew extra minutes to escape if the helicopter is 'ditched' in the sea and also increases the chances of salvaging this expensive piece of hardware. - Taken from the 1983 edition catalogue
1983 edition catalogue, listed without a number. 9 03042 is assumed.
1985 edition catalogue, listed as Kamov Ka 25 A/C from Kamov Ka-25 Hormone A.
1986 edition catalogue, listed as Kamov Ka 25 Hormone from Kamov Ka 25 A/C.
1987 edition catalogue, listed as Kamov Ka-25 A/C Hormone from Kamov Ka 25 Hormone.
1989 edition catalogue, recorded as a new kit.
1989 edition catalogue, listed as Kamov Ka25B Hormone from Kamov Ka-25 A/C Hormone.