7.El APPENDIX VII.E MASS PER UNIT AREA OF HULL, BULKHEAD, SHIELD, AND AGRICULTURE The mass per unit area of either the inner or the outer hull may be easily determined by noting (7.El) that the density of steel is approximately 0,284 lb/in 3 (= 491 lb/ft 3 = 7870 Kg/m 3 ). Taking a lm x lm section of the hull as the standard, then the mass per unit area of the hull is given by (7870) (t) Kg/m 2 , where tis given in meters. The area density of the required shielding mass is given in Appendix VI.A as 5000 Kg/m 2 . Thus, for a structural analysis of the hull cylindrical section, only the area densities of the bulkheads and the agricultural system need now be found. In order to determine the effective area density of the bulkheads, refer to Figure 7.El, a schematic layout of the hull. There are 15 longitudinal bulkheads that run almost the entire major circumference of the colony. These bulkheads have a total length of: Ll = 15[102.5 (2TT) + 200] 12,660m Six bulkheads traverse the circumference of the hull in the cylindrical section in planes perpendicular to the spin axis. Their total length is given by: L 2 = 6[102,5 (2TT)] = 3,864m As shown in Figure 7.El, the circumference traversed by bulkheads in the endcaps decreases as the spin axis is approached. The running length of these bulkheads is: circumference of the bulkheads at the inner hull Thus, the total running length of all the bulkheads is 21,567m. Their total area is then 107,833m 3 . The total mass of the bulkheads may be found from this figure and the area density of steel discussed above.
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