8. 26 schematizes a complex sequence of drilling and attachment for the major stiffeners. The purpose of this pattern is to permit drilling of matching holes in the stiffeners and hull sect.ions which will later be bolted together. Drilling these together on the lay-up bed allows easier assembly at the colony site since the fastener holes are prematched. The process goes as follows: there are four major stiffeners which will eventually be attached to a finished hull section. The stiffeners and hull section must be drilled together for bolt holes. Two of the stiffeners have already been drilled to fit the adjoining sections; the other two are new. The section and four stiffeners are laid up and drilled. Since two of the stiffeners now have all their holes drilled, they are attached to the section which is then moved out of the shop. The two new stiffeners are kept to be fitted and drilled to the next adjoining sections. In this way the hull sections and bulkheads and the stiffeners which will hold them together are custom-fitted and drilled together. Barring later mishandling, they are, therefore, guaranteed to line up during colony assembly. Since there are six hours allotted to drilling the 2000 2 cm holes of a section, this determines how many drilling heads are necessary. Assuming it takes 5 minutes to drill a 2 cm hole through 6 cm of steel,roughly 28 drilling presses are needed. Based on present-day drill presses, this yields the following mass and power specifications: Mass Power Each Unit 1.5 T kW Total (28) 42 T 112 kW VIII.5.4: Conclusion: With the equipment described above, it seems possible to take the manufactured stock parts and fabricate them into hull sections and inter-hull bulkheads at a rate of one every 16.9 hours or, in five years: 1020 Hull Sections 1050 Bulkheads
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