Oxygen required on the downward part of the second trip of the lunar The total propellant from earth required for the second lunar transfer vehicle trip is therefore 24 t + 8 t = 32 t. These figures are approximate because the 56 t of fuel for a round trip is based on all fuel loaded at low lunar orbit, and here part of the fuel is loaded on the moon. It will now be shown that the second lunar transfer vehicle flight supplies enough equipment for future copies of the lunar manufacturing facility to allow continual operation through the time more equipment is delivered by later lunar transfer vehicle flights which carry equipment from the third mass driver reaction engine trip. The second lunar transfer vehicle flight is made as soon as the mass driver reaction engine reaches low lunar orbit on its second trip. Fuel for only the second lunar transfer vehicle flight is carried on the second mass driver reaction engine trip, and the remainder of mass driver reaction engine payload on this trip is equipment for copies of the lunar and space manufacturing facilities. The full 81 t payload of the lunar transfer vehicle is available during its second flight for lunar manufacturing facility copies, so when it arrives at the lunar manufacturing facility, the total equipment for copies delivered, including that from the first lunar transfer vehicle flight, has mass 43 t + 81 t = 124 t. With enough equipment has been delivered for a total of of self-reproduction from the time the lunar manufacturing facility began operation. Since the third mass driver reaction engine trip and therefore the remaining equipment arrives 14 months after the lunar manufacturing facility began operation, adequate equipment is available. The mass of payload available for equipment for copies of the space manufacturing facility on the second mass driver reaction engine trip is 8001 - (81 1 + 32 t) = 6871. Since the men spend 2 weeks on the moon and another week at the space manufacturing facility before it begins operation, and arrive at low lunar orbit at month 27, the lunar manufacturing facility begins operation at month 27, and the space manufacturing facility at month 28. The total mass of equipment for
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