Earth Facilities 36. The cost of salaries and receivers up to the beginning of power reception is $3x10$. This is only a guess, probably accurate to 50%. 37. Computers for simulation during design and control during operations cost $3xl09 to the beginning of power reception. This is also a guess, with the same probable error of 50%. Scheduling As will be shown, the total mass of payload carried by the shuttle is 2605.404 t. Since each flight carries 30 t payload, and 30 flights per year are available, the payload carried per month is Thus launch of payload requires As will be shown, the mass driver reaction engine makes two round trips to L2 and low lunar orbit, and one final trip to L2 and low lunar orbit. The trip from low earth orbit to L2 takes 5 months, from L2 to low lunar orbit one month more, and the trip to low earth orbit one month, so the mass driver reaction engine operates for Since it expends reaction mass at 175 t/mo., of reaction mass are required. Since this mass is powdered external tanks, each of which weighs 35 t, are required. Since the shuttle carries 301 payload,
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