![]() ![]() The small sail of Thresher (the smallest fitted to an American SSN) compensated for the increased drag of the longer hull, giving Thresher a top speed of 33 knots (61 km/h 38 mph), the same as the Skipjacks, according to one recollection. Drag was reduced, with external fittings kept to a minimum and the sail greatly reduced in size. ![]() The engineering spaces were also redesigned, with the turbines supported on "rafts" that were suspended from the hull on isolation mounts for acoustic quieting. Although they used the same HY-80 steel ( yield strength 80,000 psi (550 MPa)) as the Skipjacks, the Threshers ' pressure hulls were made using an improved design that extended test depth to 1,300 ft (400 m). Tullibee was an alternate design optimized for anti-submarine warfare, much smaller and slower than the Threshers and with a quiet turbo-electric propulsion system. This placed the sonar sphere in the optimum position for detection of targets at long range. The Threshers had the large bow-mounted sonar sphere and angled, amidships torpedo tubes used in the concurrently-built Tullibee. The new class kept the proven S5W reactor plant from the immediately preceding Skipjacks, but were a radical change in many other ways. The design was managed under project SCB 188. In " Project Nobska", the Committee on Undersea Warfare of the United States National Academy of Sciences, collaborating with numerous other agencies, considered the lessons of submarine warfare and anti-submarine warfare learned from various prototypes and experimental platforms. The Thresher class was one of several results from a study commissioned in 1956 by Chief of Naval Operations (CNO) Admiral Arleigh Burke. They were followed by the Sturgeon and Los Angeles classes. They served from the 1960s through to the early 1990s, when they were decommissioned due to age. They were the forerunners of all subsequent US Navy SSN designs. ![]() They were a significant improvement on the Skipjack class, with greatly improved sonar, diving depth, and silencing. The Permit-class submarine (known as the Thresher class until the lead boat USS Thresher was lost) was a class of nuclear-powered fast attack submarines ( hull classification symbol SSN) in service with the United States Navy from the early 1960s until 1996.
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