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The F-22 uses large, two-dimensional rectangular cross-section nozzles to vector thrust upward and downward. However, these large thrust-vectoring nozzles, with their thousands of moving parts, are expensive and challenging to design 32 Military Jet Engine Acquisition due to the extraordinary forces, temperatures, acoustic vibrations, and other elements to which the nozzles are exposed and the limited “signatures” that they are allowed to produce. Although several design approaches have been explored in the laboratory and on experimental flight-test aircraft, the F-22’s F119-100 engine will have the first production thrust-vectoring nozzle.
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 (matching rotational speeds and airflow rates, avoiding resonant frequencies, and other specifics). 14 Typically, small engine modifications and adaptations of off-the-shelf engines would alter a few of the engine’s components. These modifications would likely change the cost of engines by a much smaller percentage than a derivative engine development, and possibly the changes are smaller than the magnitude of the margin of error of the CERs being developed through this research.
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.
