To determine how much equipment for making later copies of the manufacturing facilities can be carried on this trip, note that the 81 t payload of the lunar transfer vehicle must include, as will be shown, This leaves 81 t - 38 t = 43 t payload capacity available, which is used for carrying equipment for making future copies of the lunar manufacturing facility. The total of the masses so far considered for the first mass driver reaction engine trip is 521.5 t + 43 t = 564.5 t, and 800 t - 564.5 t = 235.5 t of mass driver reaction engine payload capacity remain. This will be used for equipment for future copies of the space manufacturing facility. The derivation of the masses of the objects in the above list of material for the first lunar transfer vehicle flight will now be given. 4 men spend 2 weeks on the moon, each requiring 3 kg/day of consumables. With a 50% safety margin, the mass required is It was assumed that the 4 men weigh 70 kg and require 100 kg personal equipment each, yielding The lunar manufacturing facility is required on the first lunar transfer vehicle trip so that its operation can be observed while men are there; the first week is allocated to checks, and the second to observing it in operation. The equipment for future copies of the lunar manufacturing facility is required so it can begin copying itself immediately. It will be shown that enough equipment is available for the lunar manufacturing facility to continue self-reproduction through the time that more arrives on the second lunar transfer vehicle flight. The objects shown in the above list for payload on the first mass driver reaction engine trip will now be discussed. The same time is spent by men at the space manufacturing facility as on the moon; the total mass of consumables is therefore double that used on the moon, or 0.504 t. The lunar transfer vehicle and its fuel were described in the assumptions. The orbital transfer vehicle uses 22t fuel in a round trip; 11 t is provided to it in low earth orbit, and the remainder loaded at low lunar orbit from the mass driver reaction engine payload. The lunar manufacturing facility was discussed above, and the space manufacturing facility and mass catcher are required so the men can observe its operation; as will be shown, the mass of equipment provided is enough
RkJQdWJsaXNoZXIy MTU5NjU0Mg==