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An Overview of Military Jet Engine History 109 The GE X24A design concept emerged in response to an Air Force re- quirement for a high-thrust, fuel-efficient, Mach 2 fighter engine. GE received a study contract; in 1952, the Air Force designated the new engine the J79. Full development began with Air Force funding a year later. The production prototype had its first test run less than a year later, and flight testing began in mid-1955. The J79 was originally slated for use on the Convair General Dynamics B-58, the world’s first Mach 2 bomber, and the Lockheed F-104, the world’s first Mach 2 fighter. The J79 also powered Navy aircraft, such as the Douglas F4D fighter and the North American A3J carrier-based bomber. Per- haps most important, the J79 powered the world’s most important combat aircraft of the 1960s and 1970s, the McDonnell-Douglas F-4 Phantom, used by many foreign countries as well as by both the U.S. Air Force and Navy. About 5,200 F-4 Phantoms were manufactured from 1958 through 1979, more than any other U.S. fighter since the North American F-86 in the 1950s or any other U.S. fighter since.7 Thus, the P&W J57 and the GE J79 were clearly the most important and revolutionary jet engines of the 1950s and 1960s. The J57/JT3D, originally developed through industry initiative and with company funds, laid the groundwork for all modern jet engines, made sus- tained supersonic flight practical for jet fighters, and pioneered the fan jet concept that later led to far-more-advanced fighter and com- mercial engine concepts. The J79 illustrated the tremendous thrust and speed potential of modern jet engines and demonstrated beyond a doubt the world leadership of the U.S. jet engine industry. AUGMENTED TURBOFAN ENGINES By the end of the 1950s, U.S. engine developers began focusing on new military engines that combined unprecedented high-speed ca- pabilities through the use of high thrust-to-weight ratios and after- burners with the efficiency and lower specific fuel consumption re- sulting from fanjet technology. The performance demands required by the services were high, and the technical challenges were numer- ous. The first of these engines pushed the edge of the feasible techni- cal and performance envelopes of the era. As a result, several of the ______________ 7By 2001, production of the General Dynamics/Lockheed F-16 had reached 4,300 in number and additional sales of the F-16 were likely.PDF Image | Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology
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