Hans von Ohain's First Legacy: Trends and Research Opportunities,
AIR FORCE OFFICE OF SCIENTIFIC RESEARCH BOLLING AFB DC DIRECTORATE OF AEROSPACE SCIENCES
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This discussion begins with the history and evolution of selected military engine parameters. Whenever possible, references indicate a particular engines first flight or its delivery date to the manufacturer. Cross referencing may result, however, in errors as large as five years. It is important to recognize that ten or more years separate an engines conception from its manufacture. In other words, todays engines are built with advanced technology of the late sixties. The research which sired that technology is even older.