Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology

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Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology ( military-jet-engine-acquisition-technology-basics-and-cost-e )

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Appendix B AN OVERVIEW OF MILITARY JET ENGINE HISTORY This appendix presents a historical overview of military jet engine development in the United States, with a focus on high-performance fighter jet engines. We have divided military jet engine history into four developmental periods, or generations, of jet engines that re- sulted in major leaps forward in technology and performance: (1) the original centrifugal and axial flow turbojets (first generation); (2) twin spool turbojets, variable stator turbojets, and turbofans (second gen- eration); (3) augmented (afterburning) turbofans (third generation); (4) and supercruise, stealthy “leaky turbojets” (fourth generation). FIRST-GENERATION JET ENGINE DEVELOPMENT Initial development of the first practical turbojet aircraft engines be- gan nearly simultaneously in the mid-1930s in Germany and the United Kingdom (UK). Enterprising young engineers and enthusi- asts, independent of the established aircraft engine companies, con- ducted the earliest development work on their own, with little formal financial or technical assistance from either government or industry. Eventually, with the threat of general European war looming closer, European industry and government interest in turbojet engines grew. It was not until World War II was underway, however, that U.S. government and industry committed major resources to the devel- opment and production of usable military gas turbine aircraft en- gines, and the aircraft that they would power. These early major engine development programs were concentrated in Germany and the UK, with Germany taking the lead. The United States lagged significantly behind Germany and the UK, although the 97

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