In the late 1950s, the U.S. Navy identified the need to reengineer the Thresher/Permit class, the boats of which were then being constructed. In pursuit of high-speed operations, many design aspects were sacrificed.[4] To address such deficiences, the Sturgeon class was created. This class differed from its predecessor by having an enlarged and relocated sail to accommodate additional external sensors; a second periscope was also added. Additionally, the fairwater planes on the sail could be rotated 90 degrees to allow breaking through relatively thin ice.[4] The hull was lengthened from about 278 ft (85 m) to about 292 ft (89 m); this, coupled with the larger sail, reduced the class's speed by 2 knots (2.3 mph; 3.7 km/h) compared to the Thresher/Permit class.[5] Internally, the class's layout was rearranged to improve habitability and to admit more weapons as compared to its predecessor.[4] The class was further redesigned with SUBSAFE program rules following the loss of Thresher in April 1963.[6] Among the range of armaments used by the class were the Mark 48 torpedo, the Harpoonanti-ship missile, the Tomahawkcruise missile, and the SUBROC nuclear anti-submarine missile.[1][7]
Starting with USS Archerfish (SSN-678), the hull was lengthened by 10 ft (3 m) to allow a larger living and working space compared to previous boats of the class. Nine boats incorporated this extension.[7] Other modifications included the addition of a Dry Deck Shelter (an external lockout chamber capable of accommodating SEAL Delivery Vehicles) to six boats to enable covert insertion and extraction of U.S. Navy SEALs.[7]
USS Glenard P. Lipscomb (SSN-685) was a significant modification of the Sturgeon design for an experimental propulsion system, and so was a one-ship class. USS Narwhal (SSN-671) was also identified as such during her construction, but later was admitted to have been a unique design with very little in common with the Sturgeon class
Originally designed for 20-year operational lives, boats of the Sturgeon class had this lengthened to 30 years, with a further planned three-year extension. However, many boats were retired prior to the limit to avoid costly nuclear refueling.[7] The first to be decommissioned, in October 1991, was USS Sea Devil; the last, USS Parche (SSN-683), was decommissioned in July 2005.[10] By then, the Los Angeles-, Seawolf-, and Virginia-class SSNs had entered service.
Chant, Chris (2005). Submarine Warfare Today. Leicester, United Kingdom: Silverdale Books. ISBN1-84509-158-2. OCLC156749009.
Friedman, Norman (1994). U.S. submarines since 1945: an illustrated design history. Annapolis, Maryland: Naval Institute Press. ISBN1-55750-260-9. OCLC29477981.