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The Air Force Research Laboratory (AFRL) has developed a new fuel, JP8+100, which incorporates an additive that increases by 100oF the temperature that the fuel can reach without coking. As an added benefit, AFRL has discovered during operational field testing that this additive actually cleans the engine parts downstream of the combustion process. This additive increases the cost of the fuel by approximately one cent per gallon. AFRL continues to work on fuels that can withstand even higher heat loads.

The lubrication system also generates costs throughout the engine’s life cycle. Clearly, costs are incurred in designing, integrating, and producing this subsystem. In addition, the quality of the oil operating in the hot engine environment must be monitored and maintained, leaks must be stopped, and worn or damaged components must be repaired or replaced. The oil’s maximum allowable operating temperature limits the bearing’s allowable operating temperature and increases the engine’s cooling requirements.

Size, technical characteristics, features, risk measures), which are the independent (or explanatory) variables. The relationships between An Overview of Cost-Estimating Methods 43 these variables are frequently determined using a statistical technique, such as ordinary least-squares (OLS) regression. The parametric relationships used for estimating costs are CERs. OLS can be applied to functional forms that are linear combinations of the explanatory variables. , independent variables), and Y is the outcome or the dependent variable.

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