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Introduction 3 performance of jet engines and their components. Some parameters describe the physical characteristics of an engine (such as weight, length, and material composition) whereas others describe the per- formance of an engine (such as thrust) and other performance and design characteristics of individual components (such as combustor efficiency and maximum fuel-to-air ratio). Chapter Three describes emerging engine technologies and industry and government initia- tives that may influence the costs of the future engines. The first two chapters provide background information for a general audience or for cost analysts who are unfamiliar with the basics of engine technologies. Also, an understanding of these concepts should enable program managers and cost analysts to employ the cost-estimating relationships described in the second part of this re- port and facilitate discussions on jet engines and what affects their costs. Readers who do not need the basic information presented in Chap- ters Two and Three and are nterested primarily in our cost analysis can begin at Chapter Four, which presents an overview of our princi- pal cost-estimating methods—analogy, bottom-up, and parametric. Chapter Five discusses technical estimating parameters, the data used in our analysis, and the data normalization process. Chapter Six presents a statistical analysis of historical turbofan engine cost data and the resulting parametric-cost and schedule-estimating relation- ships (i.e., the equations that result from our regression analysis). Chapter 6 concludes by integrating these estimating methods into a notional example for projecting the costs of all future military en- gines. Chapter Seven presents our conclusions, and the appendices provide substantial historical background on the development of military jet engines.PDF Image | Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology
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