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Originally Posted by XabbaRus
The Astute, like the Trafalgar class and the Vanguard have a more dolphin shaped bow. Any advantage there?
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I believe the difference in the bow form is mainly dictated by different sonar layout concepts. While the US have a bow sonar in form of a sphere the british is positioned around the "chin" of the bow.
The stretched shape with a large cylindrical part of the US boats emphasizes speed and easier series production (especially true for the LA class) while the stout shape of the british submarines offers better maneuverability.