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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 ...
In the 1980s, Boeing pitched a radical new plane: the 7J7. Designed with ultra-efficient propfan engines and advanced carbon fiber structures, the aircraft promised to leap ahead of Airbus with fuel ...
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