Ever since Charlie Taylor hand-built the first four-cylinder piston engine for the Wright Flyer in 1903, most of the step-change advances in aviation propulsion have been driven by military-led research and requirements. From the Pratt & Whitney J57 derived JT3D of yesteryear to the General Electric F101-based CFM56, many of today's civil engine workhorses stand on the shoulders of multiple innovations that emerged from military core technology. Yet, over the past 20 years, the ...


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