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Pretty simple question's How thick does the hull have to be if my sub is 60 feet long and the main cylinder part is 40 feet with a diameter of 8 feet? Also i would like to be able to dive 350m and crush depth to be 500m thats all, and would i need Ribs to support the inside of the sub? Last, with this size what type of diesel engine would i need to go 25 knots on the surface and, an electric motor, how much kw or hp would i need to go 8 knots underwater? The shape is literally a cylinder with half spheres on each end. I know these are a lot of questions but it is imperative I know them, all of them. And the abs excel sheet, does anyone know how to use it? It is very vague on the instructions. John
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