Fig. 11. Effect of productivity on power. Fig. 12. Effect of earth supplied fraction of SPS in assembly on power costs of lunar materials option. Figure 12 shows the effects of varying the percentage of material which must terrestrial in origin. Additional assumption which have been made in the analysis are: (a) an overhead of 100%; that is, one additional person (stock clerk, quality c< trol, production control, life support technician, maintenance engineer, e1 for each person involved in direct labor (b) chemical high-thrust propulsion for inter-orbit crew transportation (c) training costs of $100,000 per person in space Preliminary studies reported in Ref. (4) indicate that productivities of 250 kg/hr may be anticipated in space operations. In using these productivities it should be realized that a major portion of the labor will be involved in the manufacture of solar cells, and no reasonable projections of these costs for terrestrial, much less for space, are available for the quantities being considered here. Appendix A discusses the basis for estimating these cost ranges. It should be noted that the benefits associated with the use of lunar materials will only be realized if reasonably high productivities, of the same order as on earth, are achieved in space.
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