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In retrospect, the seven blade skew back configuration was bound to be copied. I had no idea that the USN nailed that configuration back in the 60's. The LA class had sharper tips, but then the LA class is widely rumored to have sacrificed, or at least not improved on, quieting compared the the Sturgeons for the sake of speed. But I had no idea that the first seven bladed boats dated back to the 60's; that is incredible. Obviously that was classified at the time. But still amazing that the USN nailed that configuration down so early.

 

I think it came out as a result of how easy it was to track the early SSBNs using SOSUS, with George Washington being tracked all the way across the Atlantic in her first deployment, but I have seen papers from the Royal Navy pointing out that US boats were noisier than their own (speaking about Guppy boats). This would have woken Navy leadership to the danger, as the first SOSUS array were in the Caribbean and the Soviets could have gotten a clue and start using Cuba for this (they didn't)

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The Carribean is a lot more shallow than the Atlantic. I think SOSUS relied on deep water sound phenomenon that would not have worked in the Carrib. Most of it it pretty shallow outside of the Tongue of Sea, and that place was wired up for surround sound at a very early stage in USN submarine development so Soviet boats likely didn't want to tread there.

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