Mi-8 prototype incorporating Mi-4 main rotor and transmission and one 2700shp Soloviev AI-24V turbine mounted on top of fuselage. First flown on 24 June 1961. Subsequently fitted with 5-blade rotor and two 1400shp Isotov TV2-117 engines.

Technical data for V-8 Crew: 3, passengers: 18, engine: 1 x AI-24V turboshaft, rated at 1425kW, main rotor diameter: 21.0m, take-off weight: 11200kg, empty weight: 5726kg, payload: 1500-2000kg

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