Bulkhead and intertank structures of tanks in series were analyzed to determine the configurations which yield minimum weight as a function of internal tank pressure and axial load acting on the intertank region. The problem was divided into two parts. Case I was concerned with sphericalsegment bulkheads with re-entrant knuckles, Case II was concerned with semispheroidal ellipsoid of revolution bulkheads. Each type was worked out to give optimumweight configurations for certain bulkhead eccentricities. The parameters of the final graphs involve the relative strength of the bulkhead compared to the tank cylinder and the relative loading intensity of the thrust compared to the pressurization. The change of over-all length of the total structure with eccentricity was discussed. Graphs were presented which show the change in length with eccentricity, on the basis of which the trade-off between weight- and length-optimization can be evaluated. Example problems were worked out. Author
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