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Boeing’s propfan 747 that never took off - 747-500

Boeing studied a radical 747-500 powered by large propfan engines instead of conventional turbofans. The design aimed to ...
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Boeing’s propeller-driven 747 that never flew

The Boeing 747-500 was a proposed ultra long range jumbo jet powered by advanced propfan engines instead of traditional turbofans. It promised exceptional fuel efficiency and nonstop intercontinental ...