View Single Post
Old 14-02-2015, 07:41 PM   #9
lightgiver
Senior Member
 
Join Date: Apr 2008
Location: Inactive
Posts: 36,483
Likes: 237 (190 Posts)
Arrow USS Enterprise


USS Nimitz... a documentary - Episode 1 ...
Quote:
The Nimitz-class supercarriers are a class of 10 nuclear-powered aircraft carriers in service with the United States Navy.. The lead ship of the class is named for World War II United States Pacific Fleet commander Fleet Admiral Chester W. Nimitz, the U.S. Navy's last fleet admiral..With an overall length of 1,092 ft (333 m)and full-load displacements of over 100,000 long tons, they have been the largest warships built and in service, although they are being eclipsed by the upcoming Gerald R. Ford-class aircraft carriers..Instead of the gas turbines or diesel-electric systems used for propulsion on many modern warships, the carriers use two A4W pressurized water reactors which drive 4 propeller shafts and can produce a maximum speed of over 30 knots (56 km/h) and maximum power of around 260,000 shp (190 MW).. As a result of the use of nuclear power, the ships are capable of operating for over 20 years without refueling and are predicted to have a service life of over 50 years.. They are categorized as nuclear-powered aircraft carriers and are numbered with consecutive hull numbers between CVN-68 and CVN-77..USS George H.W. Bush (CVN-77) is the 10th and final Nimitz-class supercarrier of the United States Navy..She is named for the 41st President of the United States and former Director of Central Intelligence George H. W. Bush, who was a naval aviator during World War II.. Bush '​s callsign is Avenger..


CVN-77 insignia" by US Navy..

Pressurized water reactors (PWRs) constitute the large majority of all Western nuclear power plants and are one of three types of light water reactor (LWR), the other types being boiling water reactors (BWRs) and supercritical water reactors (SCWRs). In a PWR, the primary coolant (water) is pumped under high pressure to the reactor core where it is heated by the energy generated by the fission of atoms..These nuclear fission pressurized water reactors (PWRs) were jointly designed by Bettis Atomic Power Laboratory and Knolls Atomic Power Laboratory and built by Westinghouse Electric Company..On May 15, 1946, KAPL began with a contract between General Electric and the U.S. Government to conduct nuclear research and development, including the generation of electricity from nuclear energy.. In 1950, the nuclear power plant project was converted to a Naval Nuclear Propulsion project.. Several years later Knolls' work joined that of Bettis Atomic Power Laboratory, the Argonne National Laboratory, and others in developing the world's first nuclear-powered submarine, the USS Nautilus on January 21, 1954..The previous operating contractor of KAPL was Lockheed Martin.. KAPL's original contractor was General Electric.. KAPL was one of the first laboratories to conduct research on obtaining usable power from nuclear reactors...KAPL has one computer listed on the TOP500 list of supercomputers in the world..The laboratory is also home to the U.S. Navy's Bettis Reactor Engineering School.. The school provides a post-graduate certificate program in Nuclear Engineering with a focus on nuclear reactor design, construction, and operations.. It is open only to Naval personnel and Bettis engineers..Refueling and Overhaul (ROH) refers to a lengthy process or procedure performed on nuclear-powered Naval ships, which involves replacement of expended nuclear fuel with new fuel and a general maintenance fix-up, renovation, and often modernization of the entire ship...

All 10 Nimitz-class aircraft carriers were constructed between 1968 and 2006 at Newport News Shipbuilding Company, in Newport News, Virginia, in the largest drydock in the western hemisphere, dry dock 12, now 2,172 feet (662 m) long after a recent expansion..Since USS Theodore Roosevelt, the carriers were manufactured in modular construction (USS George H.W. Bush was constructed from 161 'super-lift' modules)..The total cost of construction for each ship was around $4.5 billion..While the designs of the final se7en ships (beginning with USS Theodore Roosevelt) are slightly different from those of the earlier ships, the U.S. Navy considers all ten carriers as a single class..To lower costs, some new technologies and design features were also incorporated into USS Ronald Reagan, the previous carrier, including a redesigned island..One of the first major operations in which the ships were involved was Operation Eagle Claw launched by USS Nimitz in 1980 after she had deployed to the Indian Ocean in response to the taking of hostages in the U.S. embassy in Tehran..The two most significant deployments the Nimitz class was involved in during the 1990s were the Gulf War and its aftermath, and Operation Southern Watch in southern Iraq.. All active vessels were engaged in both of these to some extent, with Operation Southern Watch continuing until 2003..Harry S. Truman's maiden deployment was in November 2000.. The carrier's air wing flew 869 combat sorties in support of Operation Southern Watch, including a strike on Iraqi air defense sites on 16 February 2001, in response to Iraqi surface-to-air missile fire against United Nations coalition forces..

After the 11 September attacks, Carl Vinson and Theodore Roosevelt were among the first warships to participate in Operation Enduring Freedom in Afghanistan.. Carl Vinson sailed towards the Persian Gulf intending to support Operation Southern Watch in July 2001. This changed in response to the attacks, and the ship changed course to travel towards the North Arabian Sea, where she launched the first airstrikes in support of the operation on 7 October 2001..Following the attacks, John C. Stennis and George Washington participated in Operation Noble Eagle, carrying out homeland security operations off the West Coast of the United States..The carriers have also provided aid after natural disasters; in 2005, Abraham Lincoln supported Operation Unified Assistance in Indonesia after the December 2004 tsunami,and Truman provided aid after Hurricane Katrina..The Reagan Carrier Strike Group performed humanitarian assistance and disaster relief operations in the Philippines after Typhoon Fengshen..Vinson operated off Haiti, providing aid and drinking water to EQ survivors as part of the U.S. led Operation Unified Response, alongside other major warships and hospital ship Comfort...USS Nimitz and other Nimitz class carriers are near Syria..Nimitz-class carriers were designed to have a 50-year service life.. At the end of the service life, ships will be decommissioned..The new carriers will have a similar design to George H.W. Bush (using an almost identical hull shape) and technological and structural improvements..
http://en.wikipedia.org/wiki/Nimitz-...rcraft_carrier
http://www.davidicke.com/forum/showt...188385&page=15Hi, Admiral..6 months ago, your boy Tom Breaker cancelled operation 'Cleopatra', and shortly thereafter two young men from Langley showed up in Miami tried to cancel me along with it...http://www.davidicke.com/forum/showp...&postcount=605

Last edited by lightgiver; 14-02-2015 at 08:44 PM.
lightgiver is offline   Reply With Quote