The Thresher/Permit class of United States Navy submarines was the result of a study commissioned in 1956 by the Chief of Naval Operations (CNO), Admiral Arleigh Burke. In "Project Nobska," the Committee on Undersea Warfare of the National Academy of Sciences considered the lessons learned from various prototypes and experimental platforms. Image File history File links USS_Guardfish; http://www. ... USS Los Angeles A submarine is a specialized watercraft that can operate underwater. ... Species Alopias pelagicus Alopias superciliosus Alopias vulpinus Thresher sharks are large lamniform sharks of the family Alopiidae. ... The Skipjack class of United States Navy nuclear attack submarine was the replacement for the Skate class. ... USS Triton (SSRN/SSN-586), a unique vessel, was the second submarine and the fifth ship of the United States Navy to be named for Triton, a Greek demigod of the sea who was the son of Poseidon and Amphitrite. ... USS Halibut (SSGN/SSN-587), a unique guided missile submarine, was the second ship of the United States Navy to be named for the halibut, a large species of flatfish found on both sides of the Atlantic. ... USS Tullibee (SSN-597), a unique submarine, was the second ship of the United States Navy to be named for the tullibee, any of several whitefishes of central and northern North America. ... The George Washington class of United States Navy submarine were the first ballistic missile submarines in the world. ... The United States Navy (USN) is the branch of the United States armed forces responsible for naval operations. ... USS Los Angeles A submarine is a specialized watercraft that can operate underwater. ... 1956 was a leap year starting on Sunday of the Gregorian calendar. ... The Chief of Naval Operations (CNO) is the senior military officer in the United States Navy. ... Admiral Arleigh Burke in 1951 Arleigh Albert Burke (October 19, 1901 _ January 1, 1996), an Admiral of the United States Navy during World War II and the Korean War, was born far from the sea in Boulder, Colorado. ... President Harding and the National Academy of Sciences at the White House, Washington, DC, April 1921 The National Academy of Sciences (NAS) is a corporation in the United States whose members serve pro bono as advisers to the nation on science, engineering, and medicine. ...

The new class kept the proven S5W reactor plant from the immediately preceding Skipjacks, but were a radical change in many other ways. The Threshers had the large bow-mounted sonar and angled, amidships torpedo tubes pioneered by the Barracuda class. 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. Their hulls were more effectively streamlined and had smaller sails, so while they used the same reactor plant as the Skipjacks, their larger size did not reduce their speed. The Westinghouse Electric Corporations S5W nuclear reactor was the standard reactor for ships of the United States Navy from its first use in 1959 in the USS Skipjack to the introduction of the Los Angeles class submarines in the mid-1970s. ... The Skipjack class of United States Navy nuclear attack submarine was the replacement for the Skate class. ... The Barracuda-class submarines were the product of Project Kayo, a research and development effort begun immediately after World War II by the United States Navy to solve the problem of using submarines to attack and destroy enemy submarines. ... Sound proofing is any mechanism used to reduce the conduction of sound through a barrier or into a soundproofed chamber. ...

The first submarine commissioned in this class was the ill-fated Thresher (SSN-593), and so the class was known by her name. When Thresher was lost, the class took the name of the second ship in the class, Permit (SSN-594), and the SubSafe Program began. SubSafe includes specific training of SubSafe Quality Assurance inspectors in the engineroom crew, and tracks extremely detailed information about every component of a submarine's engineroom that contacts seawater. In addition, joints in any equipment carrying seawater must be welded (not brazed), and every hull penetration larger than a certain size can be quickly shut by a remote hydraulic mechanism. The second USS Thresher (SSN-593) was the lead ship of her class of nuclear-powered attack submarines in the United States Navy. ... USS Permit (SSN-594) became the lead ship of her class of submarine when the former lead ship, Thresher (SSN-593) was lost. ...

The engineroom of Jack (SSN-605) was lengthened by ten feet to accommodate an experimental direct-drive propulsion system using concentric counter-rotating propellers. Although counter-rotating propellers produced impressive gains in speed on the experimental Albacore (SS-569), in Jack the results were disappointing. USS Jack (SSN-605), a Permit-class submarine, was the second ship of the United States Navy to be named for the jack, any young pike, green pike or pickerel, or large California rockfish. ...

Flasher (SSN-613), Greenling (SSN-614), and Gato (SSN-615) were fitted with heavier machinery and a larger sail, and made ten feet longer than the other units of the class to correct stability problems caused by that weight growth. USS Flasher (SSN-613), a Permit-class submarine, was the second ship of the United States Navy to be named for the flasher, a member of the Lobotidae family of fishes, which have an unusual placement of the second dorsal and anal fins, posteriorly on the body, close to the... USS Greenling (SSN-614), a Thresher-class submarine, was the second ship of the United States Navy to be named for the greenling, an elongate, fine-scaled fish found from Kamchatka to California. ... The second USS Gato (SSN 615) was a Thresher-class submarine known as the Goal Keeper or the Black Cat. ...

General Characteristics

• Displacement: 4200 tons submerged, 3540 tons light
• Length: 278 feet, except SSN-605: 297 feet and SSN-613–615: 292 feet
• Beam: 32 feet
• Draft: 28 feet
• Speed: 30 knots
• Depth: 400 meters (1300 feet)
• Powerplant: S5W reactor
• Armament: four 21-inch torpedo tubes
• Complement: 143 officers and men

The Westinghouse Electric Corporations S5W nuclear reactor was the standard reactor for ships of the United States Navy from its first use in 1959 in the USS Skipjack to the introduction of the Los Angeles class submarines in the mid-1970s. ...

Ships

The gaps in the hull-number sequence were taken by the unique Tullibee (SSN-597), and the George Washington, Ethan Allen, and Lafayette fleet ballistic missile submarine classes. USS Tullibee (SSN-597), a unique submarine, was the second ship of the United States Navy to be named for the tullibee, any of several whitefishes of central and northern North America. ... The George Washington class of United States Navy submarine were the first ballistic missile submarines in the world. ... The Ethan Allen class of fleet ballistic missile submarine was an evolutionary development from the George Washington class. ... The Lafayette class of submarine was an evolutionary development from the Ethan Allen class of fleet ballistic missile submarine, slightly larger and generally improved. ...

• Thresher (SSN-593)
• Permit (SSN-594)
• Plunger (SSN-595)
• Barb (SSN-596)
• Pollack (SSN-603)
• Haddo (SSN-604)
• Jack (SSN-605)
• Tinosa (SSN-606)
• Dace (SSN-607)
• Guardfish (SSN-612)
• Flasher (SSN-613)
• Greenling (SSN-614)
• Gato (SSN-615)
• Haddock (SSN-621)

The second USS Thresher (SSN-593) was the lead ship of her class of nuclear-powered attack submarines in the United States Navy. ... USS Permit (SSN-594) became the lead ship of her class of submarine when the former lead ship, Thresher (SSN-593) was lost. ... USS Plunger (SSN-595), a Permit-class submarine, was the third ship of the United States Navy to be named for the plunger, a diver, a daring gambler, or a device for clearing blockages in toilets. ... USS Barb (SSN-596), a Permit-class submarine, was the second ship of the United States Navy to be named for the barb, a kingfish of the Atlantic coast. ... USS Pollack (SSN-603), a Permit-class submarine, was the second ship of the United States Navy to be named for the pollack, a food fish resembling the true cod, but with the lower jaw projecting and without the barbel. ... USS Haddo (SSN-604), a Permit-class submarine, was the second ship of the United States Navy to be named for the haddo, a pink salmon fish prevalent on the Pacific coast of the United States and Canada. ... USS Jack (SSN-605), a Permit-class submarine, was the second ship of the United States Navy to be named for the jack, any young pike, green pike or pickerel, or large California rockfish. ... USS Tinosa (SSN-606), a Permit-class submarine, was the second ship of the United States Navy to be named for the tinosa, a poisonous, black, tropical fish. ... USS Dace (SSN-607), a Permit-class submarine, was the second ship of the United States Navy to be named for the dace, any of several small North American fresh-water fishes of the carp family. ... USS Guardfish (SSN-612), a Thresher-class submarine, was the second ship of the United States Navy to be named for the guardfish, a voracious green and silvery fish with elongated pike-like body and long narrow jaws. ... USS Flasher (SSN-613), a Permit-class submarine, was the second ship of the United States Navy to be named for the flasher, a member of the Lobotidae family of fishes, which have an unusual placement of the second dorsal and anal fins, posteriorly on the body, close to the... USS Greenling (SSN-614), a Thresher-class submarine, was the second ship of the United States Navy to be named for the greenling, an elongate, fine-scaled fish found from Kamchatka to California. ... The second USS Gato (SSN 615) was a Thresher-class submarine known as the Goal Keeper or the Black Cat. ... USS Haddock (SSN-621), last of the Thresher-class submarines, was the third ship of the United States Navy to be named for the haddock, a small edible Atlantic fish related to the cod. ...