The shuttle flights per year required for crew rotation and the vehicle inventory are inputs to the model. These inputs together with a 10 year, or 500 flight, life are used to compute the shuttle buys per year. An information flow diagram of the model is given in Figure 6-2. Sample results for the photovoltaic and thermal SPSTs assembled in LEO or GEO are given in subsection 9.2. Figure 6-2. SPS transportation model.
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