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Aircraft Turbine Engine Development 123 engines can be relatively minor. At the other extreme, developing an aircraft engine from scratch (referred to as a “new centerline”) can cost billions of dollars. A common intermediate solution is to de- velop a “derivative” engine. A derivative development starts with an existing engine, and changes are made to components and controls in order to design an engine that meets the new requirements. In some cases, derivative engines are simply “growth”3 versions of the original engine intended for use in the same aircraft to accommodate increased mission require- ments or compensate for increasing aircraft weight. In other cases, derivative engines may be so different from their original engines that they seem almost incomparable. Most derivative engines are built around a previously designed engine’s core and may include other existing components as well. While engine cores are often a relatively small part of the entire engine, they tend to be expensive to design and build due to their high operating temperatures, pressures and stresses, the wide range of operating conditions over which they must smoothly function, and other factors. However, in many in- stances, significantly different engines have successfully used the same or similar cores. Engine manufacturers can save development funds and reduce risk by building a new engine around an existing core. A derivative engine is one that uses integrated sets of components (normally a full core at a minimum, and often other components as well) from existing engines. Simply incorporating the engine design principles and practices used in previous development programs does not constitute a derivative development; both new centerline and derivative developments will exploit proven design practices and principles whenever possible and wherever appropriate. Similarly, using individual components from other engines does not constitute a derivative engine, in that much of the development effort and cost go into the matching and integration of components. ______________ 3A “growth” engine is an enhanced-performance version of an existing engine, not necessarily a physically larger engine.PDF Image | Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology
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