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Originally Posted by Axeman3d
After looking at the shape of the Astute class, I decided to throw out the classic sewer pipe and just make an interesting shape. I went for width rather than height so that I could fit the most vertical launch modular weapons systems for the smallest overall size, and to make piggy-back systems much easier to accomodate. My thinking was that it should be a littoral combat ship, designed for cruise missile and SpecOps missions, as well as the classic anti-ship role. Hence the modularity and azipod steering for improved manoueverability.
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That squared bow on the Astute is not part of the pressure hull so it can have that shape.
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A sphere might be the best shape to resist pressure, but not the best for a usable submarine. The elongated body of revolution is probably the best in terms of speed, stealth and decent pressure resistance, which is why I chose it for my SSN. The current round ended sewer pipe shape popular with US subs is a compromised version of that to make it easier to fit habitable spaces inside, without the constantly changing width of the more efficient shape leaving gaps everywhere.
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Well someone could make a more hydrodynamic outer hull built around a pressure resistant spheres or cylinders. If you look at a Russian sub Speed and Stealth are functions of the machinery and outer hull while the pressure resistance is a function of the inner hull.