Engines propel aircraft and the aircraft industry. The development of a wholly new—not evolutionary or derivative but completely new—engine design is a rare event, mainly because of the enormous investment required. Airplane makers rely on engine builders for the incremental gains in performance and efficiency we call "progress." Every new generation of airliners and military aircraft is defined by a new engine family. This book teaches us that a series of small gas turbine engines was responsible for creating an entire segment of aviation.
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