Development started in May 1962 to replace piston-engined Mi-4. First prototype with single AI-24V turboshaft and four blade rotor flew in June 1961, but replaced by second prototype with twin TV2 engines and five-blade rotor adopted for production. Total delivered (military and civil): 10,000+.
Specifications: Mi-8T
Accommodation: 2 + 32
Cargo/baggage: 3,000 kg (6,614 lb)
Max speed: 140 kt (260 km/h)
Range: 229 nm (425 km)
Dimensions:
Main rotor diameter: 21.3 m (69 ft 11 in)
Length (rotors turning): 25.2 m (82 ft 9 in)
Height: 5.7 m (18 ft 7 in)
Features:
Five-blade main rotor and three-blade starboard tail rotor; twin Kilmov TV-117 turboshaft engines; horizontal stabilizer near rear of tailboom; rear clamshell doors; square or round cabin windows; tricycle landing gear.