8.47 a total of 8744m 3 or 55m 3 per person for 160 people. This should be sufficient housing for the duration of the construction period including allocation for life-support equipment, recreation facilities, on-site laboratories, and storage for consumables. Assuming the living quarter cylinder walls to be made of 3 mm thick sheet material, the four small plus one large cylinders have a mass of about 78 tons (with the small cylinders having hemispherical endcaps of 2.25m radius). Assuming 350 kg/person for interior structure and furnishings, the total mass of the empty living quarters is 134 tons. VIII.7.5: Conclusion: Using the assembly procedure outlined and the technique of bolting together prefabricated sections and bulkheads, the colony can be successfully assembled in five years. The rate limiting step in assembly is the time it takes the crew to install the fasteners. Assembly time could be reduced at least by a factor of 3 by increasing the number of crews working at one time. At that level of efficiency, the crane cannot move fast enough to transport and position the pieces and thus becomes the rate limiting step. In general, the construction scenario appears workable particularly since it baselines current technology. VIII.8: INSPECTION AND REPAIR VIII.8.1: Overall Scenario: All fabricated components are nondestructively tested for flaws as the last step of the production process. All assembled structures are inspected for weld quality and new flaws caused by assembly. Even this 100% inspection does not assure complete elimination of flawed elements in the structure, but it rejects grossly defective components and eliminates nuisance failures. The fail-safe design does not require prevention of all failures, so the inspection methods have been chosen primarily for their compatibility with high speed mass production, rather than high accuracy. Once assembled, the hull is proof-tested. A pressure test and a spin test are conducted separately to help isolate the cause of any failures. The spinning hull would be difficult to repair so
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