Mil Mi-22

Mi-22
Role	transport helicopter
Manufacturer	Mil

The Mil Mi-22 was a Soviet single-engined helicopter project of the 1960s. It resembled the Mil Mi-2 in size and shape and had problems with planned engine configuration (first W-2 config.) Later schematics interested the Russian military with illustrations of a higher-capacity engine configuration, 10A GTD-940 kW to be precise, (next W-20 config.) and had an improved fuselage, unlike the earlier Mil Mi-2. It was also planned to have a four-bladed main rotor, a two-bladed tail rotor, a larger cabin than that in the Mil Mi-2, and a skid undercarriage. The Mi-22 lost out to the larger Mi-24, which had better assault/transport abilities.

...
Wikipedia