In the early 1960s, the Soviet Union considered building a helicopter with a comparable capacity to the large Antonov An-22 turboprop. Unlike the four-engine plane that needed a runway for taking off and landing, the helicopter, which was known as the Mil V-12, would have been able to collect the cargo at the source and deliver it directly to where it needed to go, without the need for runways.
Read More Here: Mil V-12: The Story Of The Largest Helicopter Ever Built | SimpleFlying.com
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