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This paper describes the analysis, design and development carried out to engineer a compact 300 Horsepower 12,000 rpm, wet clutch system capable of operating reliably and repeatedly over a very wide range of operational conditions. The descriptions include the innovations in electro hydraulic servo control, clutch cooling and protection, and control algorithms. It demonstrates the value of understanding and working on the system as a whole rather than the control algorithms alone to obtain the requisite result.

This paper examines the utility of an auxiliary power unit (APU) starter-generator system consisting of the 400 Hz APU generator and a start converter. The reliability of the APU start system indicates improvement because of mechanical simplification and coordination of the APU acceleration and the APU engine controller, but results are difficult to quantify. Interface with the electrical power generating system (EPGS) is required since the APU generator is a shared LRU.