Providing graphic proof of aviation’s never-ending drive for higher bypass ratios and greater propulsive efficiency, General Electric’s gargantuan GE9X, the largest turbofan ever to fly, is poised to return to the skies in November for a final evaluation campaign on the company’s Boeing 747-400 flying testbed. Ready for flight test in its definitive production configuration, the 105,000-lb.-thrust GE9X is in development for Boeing’s new 777X twinjet flagship, about ...

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