The Skipjack class of United States Navy nuclear attack submarine was the replacement for the Skate class. A new design from the keel up, they were the first submarines to use a nuclear reactor in an Albacore hull: a round hull with a single shaft. Placement of the bow planes on the sail greatly reduced flow noise at the bow-mounted sonar. Deep-diving and high speed capabilities were the result of HY-80 construction and the new S5W reactor.
The Thresher/Permit class of United States Navysubmarines was the result of a study commissioned in 1956 by the Chief of Naval Operations (CNO), Admiral Arleigh Burke.
The use of a new alloy steel, HY-80, increased the boats' test depth, and a redesign of the engineering spaces, with the turbines supported on "rafts" that were suspended from the hull on sound damping isolation mounts.
The first submarine commissioned in this class was the ill-fated Thresher (SSN-593), and so the class was known by her name.
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