that the space manufacturing facility can continue self reproduction continuously through the time more arrives on the second mass driver reaction engine trip. The mass from earth required to produce generation n of a manufacturing facility is where m is the mass of a copy. This follows from the assumption that 10% of the mass of the copy is required from earth, and the fact that there are 2" - 1 copies other than the first facility at the completion of generation n. It will now be shown that there is enough equipment to allow continual operation of the manufacturing facilities until the second mass driver reaction engine flight arrives. Since the mass delivered for later copies of the lunar manufacturing facility by the first mass driver reaction engine trip was 43 t, Since a generation is produced in 3 months, this is enough for more than one year, which is longer than the 7 months until the next mass driver reaction trip arrives. For the space manufacturing facility, It must also be shown that the mass of equipment delivered by the second mass driver reaction engine trip is sufficient to allow the manufacturing facilities to operate continuously until the third mass driver reaction engine trip arrives. First the mass of fuel used by the lunar transfer vehicle will be found, which requires the determination of the number of additional lunar transfer vehicle flights after the first. The completed lunar manufacturing facility has 127 copies of the original facility, which requires that of equipment for copies be delivered. Since the first lunar transfer vehicle delivered 43 t of this equipment, 317.5 t - 43 t = 274.5 t must be delivered by later flights. Since the lunar transfer vehicle carries 811 payload. Both the hydrogen and oxygen used on the second lunar transfer vehicle flight to the moon are supplied from earth, but on the return flight and later flights, all oxygen is supplied by the lunar manufacturing facility. The relative masses of hydrogen and oxygen are 911 hydrogen per 560 t oxygen, and since the total fuel mass for a round trip is 56 t, the amount of H used in a round trip is
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