The Phase A basic program objectives were as follows:n1) Parametric definition of a pressure-fed engine system for thrust levels, propellants, etc.n2) Definition of interface data required by the booster Phase B prime contractor(s) for their particular booster config¬urationsn3) Definition of a preliminary baseline design for the pressure-fed engine system approved by NASAn4) Determination of required engine operational characteristicsn5) Determination of research, design, test and evaluation, pro¬duction and operational costs for the selected systemsn6) Identification of cost/performance/mission effectivenessn7) Recommendations.nAs a Phase A/B study to determine the feasibility of the PFE for the Space Shuttle booster the design studies were necessarily limited to key efforts which had major impacts on the technological feasibility assessment of the concept. As a result, the stress, thermal, and dynamic studies were by no means complete for final design purposes. They were sufficiently completed to provide engineering evaluation of the overall concept.
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