Figure 8.16 SPS Space Transportation Costs. Some 1992's Comments. The main technical developments required to make this STS feasible, with the performance assumptions presented above, have been outlined in the previous sections. Although some progress has been made since 1980, there has been no major breakthrough in propulsion systems or material sciences, and the development planning proposed in Figure 8.17 appears today very optimistic without significant efforts (financial) in R&D. Figure 8.17 Development Planning (in 1980)
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