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{{Short description|Leading ship of a naval fleet}}{{Multiple issues|{{More citations needed|date=August 2022}}{{Original research|date=August 2022}}}}File:Fleet 5 nations.jpg|thumb|right|Aircraft carriers form the main capital ships of most modern-era blue-water navies.]]File:Bundesarchiv DVM 10 Bild-23-61-09, Linienschiff "SMS Helgoland".jpg|thumb|right|Battleships became the main form of capital ship after sailing vessels fell out of use, and remained so up to Helgoland|1909|6}}.File:Navío santa ana de 112 cañones.jpg|thumb|right|Ships of the line (of battle) were the capital ships of the era of sail. Pictured is the Spanish Santa Ana, a very large example with 112 guns.]]The capital ships of a navy are its most important warships; they are generally the larger ships when compared to other warships in their respective fleet. A capital ship is generally a leading or a primary ship in a naval fleet.BOOK, Keegan, John, John Keegan, The Price of Admiralty, Viking, 1989, New York, 276, 0-670-81416-4, registration,weblink

Strategic implications

There is usually no formal criterion for the classification, but it is a useful concept in naval strategy; for example, it permits comparisons between relative naval strengths in a theatre of operations without the need for considering specific details of tonnage or gun diameters.A notable example of this is the Mahanian doctrine, which was applied in the planning of the defence of Singapore in World War II, where the Royal Navy had to decide the allocation of its battleships and battlecruisers between the Atlantic and Pacific theatres. The Mahanian doctrine was also applied by the Imperial Japanese Navy, leading to its preventive move to attack Pearl Harbor and the battleships of the U.S. Pacific Fleet.WEB,weblink Welcome to the website of the Force Z Survivors Association, Forcez-survivors.org.uk, 2011-07-12, 2018-10-10,weblink" title="web.archive.org/web/20181010175752weblink">weblink dead, The naval nature of the Pacific Theater of Operations, more commonly referred to as the Pacific War, necessitated the United States Navy mostly deploying its battleships and aircraft carriers in the Pacific. The war in Europe was primarily a land war; consequently, Germany's surface fleet was small, and the escort ships used in the Battle of the Atlantic were mostly destroyers and destroyer escorts to counter the U-boat threat.

Age of Sail

Before the advent of the all-steel navy in the late 19th century, a capital ship during the Age of Sail was generally understood as a ship that conformed to the Royal Navy's rating system of a ship of the line as being of the first, second, third or fourth rates:

• First rate: 100 or more guns, typically carried on three or four decks. Four-deckers suffered in rough seas, and the lowest deck could seldom fire except in calm conditions {{Citation needed|date=July 2022}}.
• Second rate: 90–98 guns.
• Third rate: 64 to 80 guns (although 64-gun third-raters were small and not very numerous in any era).
• Fourth rate: 46 to 60 guns. By 1756, these ships were acknowledged to be too weak to stand in the line of battle and were relegated to ancillary duties, although they also served in the shallow North Sea and American littorals where larger ships of the line could not sail.

Frigates were ships of the fifth rate; sixth rates comprised small frigates and corvettes. Towards the end of the Napoleonic Wars and into the late 19th century, some larger and more powerful frigates were classified as fourth rates.

Battleship / battlecruiser

File:HMS Repulse, 30 October 1926.jpg|thumb|British Repulse|1916|6}}The term "capital ship" was coined in 1909 and formally defined in the limitation treaties of the 1920s and 1930s, in the 1922 Washington Naval Treaty, 1930 London Naval Treaty, and 1936 Second London Naval Treaty. This applied mainly to ships resulting from the dreadnought revolution; dreadnought battleships (also known first as dreadnoughts and later as battleships) and battlecruisers. The term is defined in the 1936 Montreux Convention as well.JOURNAL, Brooks, RADM Thomas A., Turkey, the Montreux Convention, and Russian Navy Transits of the Turkish Straits,weblink 148/3, 1,429, US Naval Institute Proceedings, March 2022, In the 20th century, especially in World Wars I and II, typical capital ships would be battleships and battlecruisers. All of the above ships were close to 20,000 tons displacement or heavier, with large caliber guns and heavy armor protection.File:Japanese battleship Yamato running trials off Bungo Strait, 20 October 1941.jpg|thumb|Japanese battleship Yamato, the lead ship of the largest class of battleships]]Cruisers, despite being important ships, were not considered capital ships. An exception to the above in World War II was the {{sclass|Deutschland|cruiser|1}}. Though this class was technically similar to a heavy cruiser, albeit slower but with considerably heavier guns, they were regarded by some as capital ships (hence the British label "Pocket battleship") since they were one of the few heavy surface units of the Kriegsmarine. The American {{sclass|Alaska|cruiser|1}}, Dutch Design 1047 battlecruiser and the Japanese Design B-65 cruiser, planned specifically to counter the heavy cruisers being built by their naval rivals, have been described as "super cruisers", "large cruisers" or even "unrestricted cruisers", with some advocating that they even be considered battlecruisers; however, they were never classified as capital ships.Chesneau, p. 388; Garzke & Dulin, p. 86; Friedman 1984, p. 288; McLaughlin 2006, p. 104During the Cold War, a Soviet {{sclass|Kirov|battlecruiser|0}} large missile cruiser had a displacement great enough to rival World War II-era battleships and battlecruisers, perhaps defining a new capital ship for that era. In regard to technical design, however, the Kirov is simply a supersized guided-missile cruiser with nuclear propulsion.

Aircraft carrier

File:US Navy 040507-N-0120R-002 Aerial view of an F-A-18 Hornet launching off the bow of the aircraft carrier USS Kitty Hawk (CV 63) during flight operations.jpg|thumb|An F/A-18 Hornet launching from the flight deck of a modern aircraft carrier]]It took until late 1942 for aircraft carriers to be universally considered capital ships. Only full-size fleet carriers (whether purpose built, or converted from battleship/battlecruiser hulls) were regarded as capital ships, while light carriers (often using cruiser hulls) and escort carriers (often using merchant ship hulls) were not. The U.S. Navy was forcedWEB,weblink ww2pacific.com Pacific Fleet not at Pearl, 2010-11-10, 2017-06-01,weblink" title="web.archive.org/web/20170601021137weblink">weblink dead, WEB,weblink ww2pacific.com Pacific Fleet at Pearl, 2010-11-10, 2017-06-01,weblink" title="web.archive.org/web/20170601021142weblink">weblink dead, Solarnavigator.net Pearl Harbor to rely primarily on its aircraft carriers after the attack on Pearl Harbor sank or damaged eight of its Pacific-fleet battleships.In the 21st century, the aircraft carrier is the last remaining capital ship, with capability defined in decks available and aircraft per deck rather than in guns and calibers. The United States possesses supremacy in both contemporary categories of aircraft carriers, possessing 11 active duty supercarriers each capable of carrying and launching nearly 100 tactical aircraft, and nine amphibious assault ships which are equivalent in the "Sea Control Ship" configuration to the light VSTOL carriers operated by other nations.James F. Amos "Gen Amos' speech to Surface Navy Association." {{webarchive|url=https://web.archive.org/web/20110117045247weblink |date=January 17, 2011 }}

Nuclear submarines

(File:USS George Washington (SSBN-598) underway at sea, circa in the 1970s.jpg|thumb|American ballistic missile submarine {{USS|George Washington|SSBN-598|6}})Nuclear submarines, while important ships and similar in tonnage to early battleships, are usually counted as part of a nation's nuclear deterrent force and do not share the sea control mission of traditional capital ships. Nevertheless, many navies, including the Royal Navy and the United States Navy, consider these ships to be capital ships and have given some of them names previously used for battleships, e.g. Dreadnought and Vanguard.

Naming

Some navies reserve specific names for their capital ships. Names reserved for capital ships include chiefs of state (e.g. {{ship|German battleship|Bismarck||2}}), important places, historically important naval officers or admiralty (e.g. {{HNLMS|De Ruyter||2}}), historical events or objects (e.g. {{USS|Constitution}}), and traditional names (e.g. {{HMS|Ark Royal}}). However, there are some exceptions to the rule.Beginning with {{USS|Texas|1892|6}} (the first U.S. battleship), U.S. capital ships were traditionally named after U.S. states.{{efn|name=USS Kearsarge}} Cruisers are typically named after U.S. territories (e.g. Alaska-class cruisers just before and during World War II) or U.S. cities. Prior to and during World War II, the Imperial Japanese Navy also followed the practice of naming battleships after provinces (e.g. {{ship|Japanese battleship|Yamato||2}}).Despite their significance to modern fleets, the U.S. Navy has never named aircraft carriers after U.S. states. Today, U.S. aircraft carriers are usually named after politicians and other individuals notable in US naval history such as Gerald R. Ford and Chester W. Nimitz except Enterprise.Beginning with the first class of Trident-equipped ballistic missile submarines (i.e. the {{sclass|Ohio|submarine|4}}), state names have been applied to U.S. nuclear submarines. Previous ballistic missile submarines (e.g. Poseidon missile-equipped submarines) had not been named for states. After the completion of the last Ohio-class ballistic missile submarine, state names were also applied to attack submarines (e.g. {{sclass|Virginia|submarine|4}}). Earlier attack submarines had usually been named for marine animals or, commencing with the {{sclass|Los Angeles|submarine|4}}, cities and towns.

See also

• Ship of the line
• Flagship
• Dreadnought
• Battleship
• Battlecruiser
• Aircraft carrier
• Nuclear submarine
• List of sunken battleships
• List of sunken battlecruisers
• List of sunken aircraft carriers
• List of sunken nuclear submarines

Notes

{{notes| notes ={{efn| name = USS Kearsarge

Kearsarge

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