copies of the space manufacturing facility delivered by the time of the second mass driver reaction engine trip is 235.5 t + 687 t = 922.5 t. and with which allows self-reproduction for 21 months from the start of space manufacturing facility operation. The third mass driver reaction engine trip arrives 12 months after the space manufacturing facility began operation, since two months pass between the arrival of the first mass driver reaction engine trip at L2 and the beginning of its operation, and each mass driver reaction engine trip takes 7 months. The space manufacturing facility therefore has enough equipment available to operate continuously. The last mass driver reaction engine trip carries fuel for the lunar transfer vehicle and equipment for the remaining copies of the lunar and space manufacturing facilities. Since three more lunar transfer vehicle trips are required, the fuel mass from earth is When added to the lunar transfer vehicle fuel mass considered previously, the total is 32 t + 24 t = 56 t, which is the mass given in the above list of all objects carried by the mass driver reaction engine. Since the lunar manufacturing facility began operation at month 27, and requires 7 generations to produce the total of 128 lunar manufacturing facilities, it is complete at month 27 + (7 • 3) = 48. The space manufacturing facility is completed one month after the 8th generation, and since its operation began at month 28, it is finished at month 28 + (8 • 3) + 1 = 53. The space manufacturing facility now begins the construction of the large mass driver reaction engines. Since the mass of a solar power satellite is 105 t, the number of large mass driver reaction engines required is Each large mass driver reaction engine has mass 1600 t, so the total mass of the 13 large mass driver reaction engines is
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