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Chapter Five ESTIMATING PARAMETERS AND GATHERING DATA The principal focus of our work in this study is to add new observa- tions on estimating aircraft engine costs to previous RAND studies and update the parametric relationships for engine costs and devel- opment time (see Chapter Four for a discussion of parametric rela- tionships). Our goal was to extend and improve the earlier analyses in two ways. First, most of the previous engine cost studies grouped turbojet and turbofan engine types into the same population. This grouping was done for pragmatic reasons because there were far fewer observa- tions for turbofans than there are today. To provide a more homoge- neous population, we focus exclusively on parametric relationships for turbofan engines (as mentioned earlier, turbojet engines are sel- dom used in modern aircraft for reasons related to efficiency and op- erating costs). Second, it was often difficult to determine how the earlier studies treated an engine family. Engines are developed and produced within “families” in which a main engine is developed first and derivative engines follow later. Derivative engines represent either evolutionary improvements to the primary engine or modifications to meet a specific application. Within a family, “dash numbers” identify different engine models. For example, the F100 engine was first produced as the F100–100, with the F100-200, F100-220, F100- 229, and F100-232 models following later. In our analysis, we treat each model (or dash number) as a separate observation. However, we explicitly consider how derivative engines relate to first-of-a-kind 47PDF Image | Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology
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