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The Soviet Union's Monster Mi-6 Helicopter Airliner

The helicopter could comfortably seat between 70 and 80 passengers in style, although it was never mass-produced.

This particular Mi-6 featured relatively large stub wings mounted on the upper-mid fuselage area, which were used to create lift and unload the rotor, improving overall performance and efficiency substantially during the cruise phase of flight. Unknown author In terms of other modifications, the rear clam-shell doors and cargo ramp of the underlying Mi-6 were replaced with an identically shaped fairing, incorporating built-in airstairs on the centerline and an AI-8 auxiliary power unit. Source: Yefim Gordon and Dmitriy Komissarov, MIL’ Mi-6/-26:Heavy-Lift Helicopters In 1963, the airline stressed the need for a civilian transport version of the Mi-6 in order to help support construction as well as oil and gas work in the eastern parts of the USSR.

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