MI-4

The Mil Mi-4 (NATO code: Hound) was a multi-role Soviet-made helicopter with a full metal, half-shell structure, with a fixed, four-support undercarriage in a classic configuration, with a main rotor and a tail rotor on the beam. The drive was provided by a single ASZ-82-W radial engine with a capacity of 1700 KM. The flight of the first prototype took place in June 1952, and serial production lasted from 1953 to 1969. The main impetus for the development of the Mi-4 was the experience of the Korean War (1950-1953) and the desire to increase the mobility and transport capabilities of the Soviet Army. Several upgrades of the basic version (Mi-4A) were created. The first chronologically was the Mi-4S version, in which the ergonomics of the machine was improved - it continued to function as an amphibious and ambulance helicopter. Later, the Mi-4M model was developed, which was an anti-submarine helicopter (ZOP). Civil versions have also been developed, such as the Mi-4L (fire helicopter) or Mi-4SCH (agricultural helicopter). The successful Mi-4 was widely exported to the Warsaw Pact countries, but also to Sudan and Syria, for example. In China, the Mi-4 was also produced under the Harbin Z-5 designation. Mi-4 helicopters took part in numerous armed conflicts, including the Indian-Pakistani wars (1961-1962, 1965 and 1970), the Vietnam War (1964-1975) or the war in Afghanistan (1979-1989).