1411 (flight / 30 t) = 4.7 = 5 flights. The reaction mass required is the same as in the plan for construction from asteroidal resources with pure self-reproduction, 100 t. Since 5 t of mass from each external tank used as a source of aluminum remain, the mass of the remainder is for a total requirement of 4 + 3 = 7. The flights for payload supply 5 of these, so 2 more are required from flights for purposes other than this plan. Since the rate of construction by the space manufacturing facility is 32.2 t / mo., and the mass driver reaction engine and tank powderer have total mass 174 t + 25 t = 199 t, the construction takes Since 30 shuttle flights per year are available for this plan, the 5 flights for payload take There are 10 tanks per year available from flights other than this plan, so the 2 additional tanks required are provided in after their collection begins. Let month 0 be that at which both this collection of the additional tanks and the shuttle flights for payload for this plan begin; at month 3 all collection of objects in low earth orbit is complete, but the space manufacturing facility begins construction at month 2. The construction is complete at month 2 + 7 = 9, when the mass driver reaction engine leaves low earth orbit. All operations thereafter are identical to those without construction in low earth orbit. As before, the time between departure from low earth orbit and arrival of the first group of 15 solar power satellites at geosynchronous orbit is
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