Fig. 6. Effect of R & D costs on cumulative program cost. Base line circled. Fig. 7. Effect of R & D costs on cumulative program costs. Fig. 8. Effect of chemical propulsion use for lunar materials option. (T2). The dominating effect of fuel transport, even when the oxidizer is not transported, is evident from a comparison of Figs. 6 and 8. It should be noted that the conversion efficiency in the refining process is 10%, consequently the need to transport large quantities of unrefined lunar material to lunar orbit dominates the system
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