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Los Angeles class Attack Submarine - SSN


los angeles class attack submarine us navy ssn-688 improved




688 - Los Angeles class (Flight I)

SSN 688 USS Los Angeles (1976-2011)

SSN 689 USS Baton Rouge (1977-95)

SSN 690 USS Philadelphia (1977-2010)

SSN 691 USS Memphis (1977-2011)

SSN 692 USS Omaha (1978-1995)

SSN 693 USS Cincinnati (1978-1996)

SSN 694 USS Groton (1978-1997)

SSN 695 USS Birmingham (1978-1997)

SSN 696 USS New York City (1979-1997)

SSN 697 USS Indianapolis (1980-1998)

SSN 698 USS Bremerton (1981)

SSN 699 USS Jacksonville (1981)

SSN 700 USS Dallas (1981)

SSN 701 USS La Jolla (1981-2015)

SSN 702 USS Phoenix (1981-98)

SSN 703 USS Boston (1982-99)

SSN 704 USS Baltimore (1982-98)

SSN 705 USS City of Corpus Christi (1983-2016)

SSN 706 USS Albuquerque (1983-2015)

SSN 707 USS Portsmouth (1983-2005)

SSN 708 USS Minneapolis-St. Paul (1984-2007)

SSN 709 USS Hyman G. Rickover (1984-2007)

SSN 710 USS Augusta (1985-2008)

SSN 711 USS San Francisco (1981-2016)

SSN 712 USS Atlanta (1982-99)

SSN 713 USS Houston (1982-2016)

SSN 714 USS Norfolk (1983-2014)

SSN 715 USS Buffalo (1983)

SSN 716 USS Salt Lake City (1984-2006)

SSN 717 USS Olympia (1984)

SSN 718 USS Honolulu (1985-2007)



688 - Los Angeles class (Flight II / VLS)

SSN 719 USS Providence (1985)

SSN 720 USS Pittsburgh (1985)

SSN 721 USS Chicago (1986)

SSN 722 USS Key West (1987)

SSN 723 USS Oklahoma City (1988)

SSN 724 USS Louisville (1986)

SSN 725 USS Helena (1987)

SSN 750 USS Newport News (1989)



688 - Los Angeles class (Flight III / improved)

SSN 751 USS San Juan (1988)

SSN 752 USS Pasadena (1989)

SSN 753 USS Albany (1990)

SSN 754 USS Topeka (1989)

SSN 755 USS Miami (1990-2014)

SSN 756 USS Scranton (1991)

SSN 757 USS Alexandria (1991)

SSN 758 USS Asheville (1991) 

SSN 759 USS Jefferson City (1992)

SSN 760 USS Annapolis (1992)

SSN 761 USS Springfield (1993)

SSN 762 USS Columbus (1993) 

SSN 763 USS Santa Fe (1993)

SSN 764 USS Boise (1992) 

SSN 765 USS Montpelier (1993)

SSN 766 USS Charlotte (1994)

SSN 767 USS Hampton (1993)

SSN 768 USS Hartford (1994)

SSN 769 USS Toledo (1995)

SSN 770 USS Tucson (1995)

SSN 771 USS Columbia (1995)

SSN 772 USS Greeneville (1996)

SSN 773 USS Cheyenne (1996)




General Dynamics Electric Boat, Groton, Connecticut, USA

Newport News Shipbuilding, Newport News, Virginia, USA

Displacement: 6082 tons ( surfaced) / 6927 tons (submerged)

Length: 109,73 meters

Beam: 10,06 meters

Draft: 9,4 meters

Speed: 25+ knots (46+ km/h), max.

Propulsion: 1 x Westinghouse S6G nuclear reactor / 26MW delivering 35000 shp / 1 shaft / 1 propeller

Complement: 130



Flight I:

4 x 21" (533mm) torpedo tubes for UGM-109 Tomahawk missiles, UGM-84 Harpoon SSM or Mk-48 torpedoes or mines

Flight II & III:

4 x 21" (533mm) torpedo tubes for Mk-48 torpedoes or Mk-67 and Mk-60 CAPTOR mines

1 x Mk-45 Vertical Launching System (VLS)  - 12 cells for UGM-109 Tomahawk missiles or UGM-84 Harpoon SSM


Los Angeles class submarines carry about 25 torpedo tube-launched weapons, as well as Mark 67 and Mark 60 CAPTOR mines and were designed to launch Tomahawk cruise missiles, and Harpoon missiles horizontally (from the torpedo tubes). The last 31 boats of this class also have 12 dedicated vertical launching system (VLS) tubes for launching Tomahawks.

Two watertight compartments are used in the Los Angeles class submarines. The forward compartment contains crew living spaces, weapons-handling spaces, and control spaces not critical to recovering propulsion. The aft compartment contains the bulk of the submarine's engineering systems, power generation turbines, and water-making equipment. Some submarines in the class are capable of delivering SEALs through either the dry deck shelter system or the advanced SEAL delivery system (program canceled in 2006 and rendered unusable in 2009). A variety of atmospheric control devices are used to allow the vessel to remain submerged for long periods of time without ventilating, including an electrolytic oxygen generator nicknamed "the bomb". It is called "the bomb" because it electrically removes the bonds of hydrogen and oxygen which make up water. This produces oxygen for the crew and hydrogen. The hydrogen is pumped overboard but there is always a risk of fire or explosion from this process.

While on the surface or at snorkel depth, the submarine may use the submarine's auxiliary or emergency diesel generator for power or ventilation (e.g., following a fire). The diesel engine in a 688 class can be quickly started by compressed air during emergencies or to evacuate noxious (nonvolatile) gases from the boat, although 'ventilation' requires raising a snorkel mast. During nonemergency situations, design constraints call for operators to allow the engine to reach normal operating temperatures before it is capable of producing full power, a process that may take from 20 to 30 minutes. However, the diesel generator can be immediately loaded to 100% power output, despite design criteria cautions, at the discretion of the submarine commander on the recommendation of the submarine's engineer, if necessity dictates such actions to a) restore electrical power to the submarine, b) prevent a reactor incident from occurring or escalating, or c) to protect the lives of the crew or others as determined necessary by the commanding officer.

Normally, steam power is generated by the submarine's nuclear reactor delivering pressurized hot water to the steam generator, which generates steam to drive the steam-driven turbines and generators. While the emergency diesel generator is starting up, power can be provided from the submarine's battery through the ship service motor generators. Likewise, propulsion is normally delivered through the submarine's steam-driven main turbines that drive the submarine's propeller through a reduction gear system. The submarine has no main drive shaft, unlike conventional diesel electric submarines.

The boat is equipped with a 26MW nuclear pressure water reactor, model GE PWR S6G generating 35,000 shp, developed and supplied by General Electric. The auxiliary prop motor by Magnatek supplies 242kW. The life of the fuel cells is approximately ten years. Part of the improved 688 program included the improved Performance Machinery Program Phase I.

The S6G reactor plant was originally designed to use the D1G-2 core, similar to the D2G reactor used on the Bainbridge class guided missile cruiser, which is rated at 148 MW. All Los Angeles class submarines from USS Providence (SSN-719) on were built with a D2W core rated at 165 MW, as opposed to the older 150 MW cores found on older boats. The D1G-2 cores are being replaced with D2W cores when the boats are refueled.

source: wikipedia


class & detail images

los angeles class attack submarine flight 1
Flight I (SSN 690)

los angeles class attack submarine us navy
Flight I (SSN 691)

Flight I (SSN 698)

Flight I (SSN 698)

Flight I (SSN 700) with dry-deck shelter

los angeles class attack submarine ssn dry deck shelter
Flight I (SSN 700) with dry-deck shelter

los angeles class attack submarine flight 2 vls mk-45 vertical launching system for ugm-109 tomahawk tlam missile
Flight II (SSN 723) with 12-cell Mk-45 VLS

los angeles class attack submarine flight 2 mk-45 vertical launching system vls ugm-109 tomahawk missile
Flight II (SSN 723) with 12-cell Mk-45 VLS

Flight III (SSN 755) improved Los Angeles class (688i)

Flight III (SSN 758) improved Los Angeles class (688i)

Flight III (SSN 758) improved Los Angeles class (688i)

Flight III (SSN 762) improved Los Angeles class (688i)

los angeles class attack submarine flight 3 688i improved
Flight III (SSN 769) improved Los Angeles class (688i)

los angeles class attack submarine ssn advanced seal delivery system asds
Flight III (SSN 772) improved Los Angeles class (688i) with Advanced SEAL Delivery System (ASDS)

Flight III (SSN 773) improved Los Angeles class (688i)


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