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Originally Posted by PatrickWarner
Is it really true that travelling at more than around 10 knots breaks the periscope on a submarine?
I guess it must be (?) but it seems strange that after all this time they haven't figured a way to make it work at faster speeds.
Is that because of technology limitations or is it more that they don't see a need to have it working at higher speeds?
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There's not really much of a need. At slower speeds, it already starts to make a wake that can be quite visible from a distance. If you're running that fast, you're probably not hunting either, you're probably evading. I'm sure it's also a physics limitation. The periscope is of such and such a thickness and it's quite long so the water flow would put quite a torquing moment on the metal.