2nd Generation Rlv Risk Reduction Definition Program Pratt & Whitney Propulsion Risk Reduction Requirements Program (Ta-3 & Ta-4)

This is the final report and addresses all of the work performed on this program. Specifically, it covers vehicle architecture background, definition of six baseline engine cycles, reliability baseline (space shuttle main engine QRAS), and component level reliability/performance/cost for the six baseline cycles, and selection of 3 cycles for further study. This report further addresses technology improvement selection and component level reliability/performance/cost for the three cycles selected for further study, as well as risk reduction plans, and recommendation for future studies. Matlock, Steve Marshall Space Flight Center NAS8-00168