Half a century after the world’s first 40,000-lb.-plus-thrust high-bypass turbofans entered development for the emerging widebody era, studies are underway for a new generation of powerplants in the same thrust bracket. But now, unlike the 1960s—when General Electric, Pratt & Whitney and Rolls-Royce had very specific power requirements for the Boeing 747 and the new trijets—the picture is far from clear. While it is increasingly obvious that new engines will be needed ...


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