15. External tanks from shuttle flights for purposes other than this plan are brought into orbit and provided free to this plan. It is assumed that at least 10 such external tanks can be provided to the plan per year, because the low earth orbit in which materials for this plan are collected is close to equatorial, and the number of shuttle flights per year which are not into inclined orbits close to polar is planned to be at least 10 starting in 1984 [23], Human Facilities 16. Men are required only one time in space, to check the first space manufacturing facility and lunar manufacturing facility. 17. The number of men, 4, is based on the mass allowed for the space habitat in S.S.I., 12 t, [24] and the mass allowed for the lunar habitat of SP-428, which has mass 72 t and 24-man capacity [25], On this basis, the 12 t habitat can house 18. The habitat at the lunar manufacturing facility has the same capacity and mass as the one at the space manufacturing facility. 19. Expected consumables for the men have mass 3 kg /(person day), [26] and a 50% additional margin of safety is allowed. 20. In addition to consumables, men require 100 kg each of personal equipment, including space suit, and carry this on the orbital transfer vehicle This mass is not considered here in shuttle transportation requirements since it is within the mass carried in the shuttle crew compartment. Each man has mass 70 kg. This mass is not included in that carried by the mass driver reaction engine since the men and their equipment are carried by the orbital transfer vehicle. 21. Consumables used on the orbital transfer vehicle are considered part of the orbital transfer vehicle mass. 22. Costs of consumables and equipment for the men are assumed so low that they will be neglected. 23. Men spend 2 weeks at the lunar manufacturing facility, then 2 more at the space manufacturing facility. They reach low lunar orbit at the same time as the first mass driver reaction engine trip. Manufacturing Equipment 24. The first lunar manufacturing facility has mass 37 t, and includes a mass driver, chemical refining equipment, machining and assembly facilities, and the habitat [27], Later copies of this facility do not include the habitats, so the mass of each is 251.
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