Los Angeles-class submarine
USS Asheville (SSN-758) arrives at Naval Base Point Loma, California in Nov 2005.
|Builders:||Newport News Shipbuilding
General Dynamics Electric Boat
|Operators:||United States Navy|
|Preceded by:||Sturgeon class attack submarine|
|Succeeded by:||Seawolf class attack submarine
Virginia class attack submarine
Surfaced: 6,082 tonnes (5,986 long tons)Submerged: 6,927 tonnes (6,818 long tons)
|Length:||362 ft (110 m)|
|Beam:||33 ft (10 m)|
|Draft:||31 ft (9.4 m)|
|Propulsion:||1 GE PWR S6G nuclear reactor, 2 turbines 35,000 hp (26 MW), 1 auxiliary motor 325 hp (242 kW), 1 shaft|
Surfaced:20 knots (23 mph; 37 km/h)
|Range:||Refueling required after 30 years|
|Test depth:||950 ft (290 m)|
|BQQ-5 Suite which includes Active and Passive systems SONAR, BQS-15 detecting and ranging SONAR, WLR-8V(2) ESM receiver, WLR-9 acoustic receiver for detection of active search SONAR and acoustic homing torpedoes, BRD-7 radio direction finder, BPS-15 RADAR|
|WLR-10 countermeasures set|
|Armament:||4× 21 in (533 mm) torpedo tubes, 37x Mk 48 torpedo, Tomahawk land attack missile, Harpoon anti–ship missile, Mk 67 mobile, or Mk 60 Captor mines (most boats in service as of 2011 have a 12-tube VLS)|
The Los Angeles-class, sometimes called the LA-class or the 688-class, is a class of nuclear-powered fast attack submarines that forms the backbone of the U.S. Navy's submarine force, with 62 submarines of this class being completed. As of late 2012, 40 of the class are still in commission and 20 retired from service, mostly due their mid-life reactor refuelings being cancelled. A further four boats were proposed by the Navy, but later cancelled. The Los Angeles class contains more nuclear submarines than any other class in the world. The Los Angeles class was preceded by the Sturgeon class and followed by the Seawolf. Except for USS Hyman G. Rickover (SSN-709), all submarines of this class are named after American cities and a few towns (e.g. Key West, Florida and Greeneville, Tennessee). This system of naming broke a long-standing tradition in the U.S. Navy of naming attack submarines for creatures of the ocean (e.g. USS Nautilus (SSN-571)).
The final 23 boats of the Los Angeles class were designed and built to be quieter than their predecessors and also to carry more-advanced sensor and weapons systems. These advanced boats were also designed for operating beneath the polar ice cap. Their diving planes were placed at their bows rather than on their sails, and they have stronger sails for penetrating thick ice.
According to the U.S. Department of Defense, the top speed of the submarines of the Los Angeles class is over 25 knots (29 m.p.h. or 46 k.p.h.), although the actual maximum is classified. Some published estimates have placed their top speed at 30 to 33 knots. In his book Submarine: A Guided Tour Inside a Nuclear Warship, Tom Clancy estimated the top speed of Los Angeles-class submarines at about 37 knots.
The U.S. Navy gives the maximum operating depth of the Los Angeles class as 650 feet (200 m), while Patrick Tyler, in his book Running Critical, suggests a maximum operating depth of 950 feet (290 m). Although Tyler cites the 688-class design committee for this figure, the government has not commented on it. The maximum diving depth is 1,475 feet (450 m) according to Jane's Fighting Ships, 2004–2005 Edition, edited by Commodore Stephen Saunders of the Royal Navy.
Weapons and fire control systems 
Los Angeles class submarines carry about 25 torpedo-tube-launched weapons and all boats of the class are capable of launching Tomahawk cruise 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.
Engineering and auxiliary systems 
There are two watertight compartments in the Los Angeles class of 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 (DDS) system or the Advanced SEAL Delivery System (ASDS; program canceled in 2006 and rendered unusable in 2009). A variety of atmospheric control devices are used to remain submerged for long periods of time without ventilating, including an Electrolytic Oxygen Generator (EOG) nicknamed "the bomb".
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 (non-volatile) gases from the boat, although 'ventilation' requires raising of a snorkel mast. During non-emergency situations, design constraints require 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 via 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 (SSMGs). 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.
In popular culture 
- Los Angeles-class submarines have been featured prominently in numerous Tom Clancy novels and film adaptations, most notably the USS Dallas (SSN-700) in The Hunt for Red October.
- The 2000 Australian television film On the Beach features a fictional 688i Los Angeles-class submarine, the USS Charleston (SSN-704).
- In the 2009 film Terminator Salvation, Resistance Headquarters is located aboard a Los Angeles-class submarine, called the USS Wilmington according to the novelization and several behind-the-scenes books.
- The Los Angeles-class submarine is the focus of many submarine-related video games, such as the simulators 1989 688 Attack Sub, Electronic Arts' 1997 688(I) Hunter/Killer, and the 2005 Dangerous Waters.
- The USS Chicago (SSN-721) plays a prominent role in Tom Clancy's novel Red Storm Rising (1986).
- Call of Duty: Modern Warfare 2 (2009) features the USS Chicago (SSN-721) as the launching platform for TF 141's operations. Another Los Angeles class, the USS Dallas (SSN-700), can also be seen in the level "The Only Easy Day... Was Yesterday".
- The USS Alexandria (SSN-757) was used in filming Stargate: Continuum.
- A fictional Los Angeles-class submarine named the USS Orlando appeared in the 1996 comedy film Down Periscope.
See also 
- List of Los Angeles class submarines
- List of active Los Angeles class submarines by homeport
- List of inactive Los Angeles class submarines by disposition
- "Ship Battle Forces". Nvr.navy.mil. Retrieved 27 March 2012.
- "U.S. Navy Fact Sheet - Attack Submarines - SSN". United States Navy. Retrieved 20 April 2008. "General Characteristics, Los Angeles class ... Speed: 20+ knots (23+ miles per hour, 36.8 +km/h)"
- Polmar, Norman; Moore, Kenneth J. (2003). Cold War Submarines:The Design and Construction of U.S. and Soviet Submarines. Brassey's. p. 271. ISBN 1-57488-594-4
- "Officials: U.S. submarine hit undersea mountain". CNN. 11 January 2005. Retrieved 20 April 2008. "The submarine was traveling in excess of 33 knots - about 35 mph - when its nose hit the undersea formation head-on, officials said."
- SSN-688 Los Angeles class from Federation of American Scientists retrieved 29 February 2008 :The 18 SSN-688 class submarines that will be refueled in their midlives could make good candidates for a service life extension because they could operate for nearly 30 years after the refueling. After these submarines serve for 30 years, they could undergo a two-year overhaul and serve for one more 10-year operating cycle, for a total service life of 42 years.
- Polmar, Norman "The U. S. Navy Electronic Warfare (Part 1)" United States Naval Institute Proceedings October 1979 p.137
- Tyler, Patrick (1986). Running Critical. New York: Harper and Row. pp. 24, 56, 66–67. ISBN 978-0-06-091441-7.
- Waddle, Scott (2003). The Right Thing. Integrity Publishers. pp. xi (map/diagram). ISBN 1-59145-036-5. "This reference is for operating depth only"
- Tyler, (1986). pp. 66-67, 156
- "Notes in pp. 64-67: Deliberations of ad-hoc committee on SSN 688 design taken from confidential sources and from interviews with Admiral [Ret] Rickover...." From Tyler, p. 365
- Saunders, (2004). pp. 838
- SSN-688 Los Angeles Class Design. Los Angeles Class at Globalsecurity.org. Accessed on 7 January 2009
- Polmar & Moore, (2003). pp. 263
- Treadwell Supplies Oxygen Generator Components for Nuclear Subs Defense Industry Daily 28-January-2008
- Fairbanks Morse Engines Marine Installations Accessed on 29 April 2008
- Auxiliary Division on USS Cheyenne USS CHEYENNE SSN-773 Department & Divisions from Federation of American Scientists. Accessed on 29 April 2008
- Firefighting and Damage Control Update 181044Z JUN 98 (SUBS) Message COMSUBLANT (1998) Accessed on 29 April 2008
- DiMercurio, Michael; Benson, Michael (2003). The complete idiot's guide to submarines. New York, NY: Alpha Books. pp. 49–52. ISBN 978-0-02-864471-4
- Elger, Wallace (2005). "Development of Metal Fiber Electrical Brushes for 500kW SSMG Sets". Naval Engineers Journal 117 (4): 37–38. doi:10.1111/j.1559-3584.2005.tb00382.x.
- Nuclear Propulsion Pressurized water Naval nuclear propulsion system at Federation of American Scientists Accessed on 30 April 2008
- Clancy, Tom (1984). The Hunt for Red October. Naval Institute Press. pp. 71, 77, 81. ISBN 0-87021-285-0.
- Foster, Alan Dean (2009). Terminator Salvation: The Official Movie Novelization. Titan Books. ISBN 1-84856-085-0.
- Bennett, Tara (2009). Terminator Salvation: The Official Companion. Titan Books.
- "Stargate: Continuum to Film Scenes in the Arctic". comingsoon.net. March 14, 2007. Retrieved July 19, 2012.
- This article includes information collected from the Naval Vessel Register, which, as a U.S. government publication, is in the public domain.
- Clancy, T. (1984). The Hunt for Red October. Annapolis, Maryland: Naval Institute Press. ISBN 0-87021-285-0.
- DiMercurio, M.; Benson, M (2003). The Complete Idiot's Guide to Submarines. New York: Alpha Books. ISBN 978-0-02-864471-4.
- Hutchinson, R (2001). Jane's Submarines: War Beneath the Waves from 1776 to the Present Say. London: HarperCollins. ISBN 978-0-00-710558-8.
- Polmar, N; Moore, K. J. (2003). Cold War Submarines: The Design and Construction of U.S. and Soviet Submarines. Washington, D.C.: Brassey's. ISBN 1-57488-594-4.
- Tyler, P. (1986). Running Critical. New York: Harper & Row. ISBN 978-0-06-091441-7.
- Waddle, S (2003). The Right Thing. Nashville, Tennessee: Integrity Publishers. ISBN 1-59145-036-5.
- Saunders, S (2004). Jane's Fighting Ships, 2004-2005. Coulsdon, Surrey, UK: Jane's Information Group Limited. ISBN 0-7106-2623-1.
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