Ship class


A ship class is a group of ships of a similar design. This is distinct from a ship type, which might reflect a similarity of tonnage or intended use. For example, is a nuclear aircraft carrier of the .
In the course of building a class of ships, design changes might be implemented. In such a case, the ships of different design might not be considered of the same class; each variation would either be its own class, or a subclass of the original class. If ships are built of a class whose production had been discontinued, a similar distinction might be made.
Ships in a class often have names linked by a common factor: e.g. s' names all begin with T ; and s are named after American battles. Ships of the same class may be referred to as sister ships. Ship classes can be either military, as noted above, or civilian, such as the of cruise ships.

Naval ship class naming conventions

Overview

The name of a naval ship class is most commonly the name of the lead ship: the first ship commissioned or built of its design. However, other systems can be used without confusion or conflict. A descriptive name may be used; for example, it was decided to group destroyers made to the same design as HMS Tomahawk, all named after weapons, as the -class rather than Tomahawk-class.

Europe in general

In European navies, a class is named after the first ship commissioned regardless of when it was ordered or laid down. In some cases this has resulted in different class names being used in European and U.S. references; for example, European sources record the s of the United States Navy as the "Maryland class", as was commissioned before.

Germany

The West German Navy used a three-digit type number for every class in service or in advanced project state. Modified versions were identified by a single letter suffix. After the reunification of Germany the German Navy kept the system. Informally, classes are also traditionally named after their lead ships.

Indonesia

The Indonesian Navy has a traditional naming system for its ships. In addition, the ship's type and missions can be identified by the first number on the ship's three-digit hull number, which is placed on the front bows and the back of the stern. The naming convention is:
  • Hull number beginning with 1 : ancient empires and kingdoms
  • Hull number beginning with 2 : Indonesia's main islands
  • Hull number beginning with 3 : national heroes
  • Hull number beginning with 4 : mythical weapons, National heroes
  • Hull number beginning with 5 : main and strategic bays, big cities, small cities, National figures
  • Hull number beginning with 6 : mythical weapons, traditional weapons, wild animals
  • Hull number beginning with 7 : every island begin with letter "R", letter "F"
  • Hull number beginning with 8 : native fishes and sea creatures, native snakes and wild reptiles, wild insects, geographical places
  • Hull number beginning with 9 : volcanoes, cities, mythical figures, geographical capes and straits

Russia/Soviet Union

Russian ship classes are formally named by the numbered project that designed them. That project sometimes, but not always, had a metaphorical name, and almost always had a NATO reporting name. In addition, the ships of the class would have a number prefixed by a letter indicating the role of that type of vessel. For example, Project 641 had no name, though NATO referred to its members as s.
The ship classification does not completely correspond common designation, particularly for destroyers, frigates and corvettes. Russia has its own classification system for these ships:
  • Squadron Torpedo Carriers are traditionally referred to as destroyers. The Russian word for destroyer is used in the air force for fighter aircraft.
  • Destroyers can also be classified as Big Anti-submarine Ships or Big ASW Ships. They are alternatively classified as cruisers. The Russian Big Anti-submarine Ships type also has its sub-type of Guard Ships.
  • Guard Ships are usually referred to as frigates.
  • Another substantial type in Russia are Small Anti-submarine Ships or Small ASW Ships. These are referred to as corvettes. Corvettes are also classified as Small Missile Ships or Missile Boats in Russia.

United Kingdom

The British Royal Navy (RN) has used several methods of naming classes. In addition to the accepted European convention, some classes have been named after a common theme in the included ships' names, e.g., s, and some classes were implemented as an organizational tool, making traditional methods of naming inefficient. For instance, the is also known as the A class. Most destroyer classes were known by the initial letter used in naming the vessels, e.g., s. Classification by letter also helped to conflate similar smaller classes of ships as in the case of the A-class destroyers of 1913 whose names spread across the alphabet. Since the end of the Second World War, Royal Navy ship classes have also been known by their type number

United States

For the United States Navy, the first ship in a class to be authorized by Congress is the designated class leader and gives the name to the class, regardless of the order in which the ships of that class are laid down, launched or commissioned. Due to numbering conventions, the lead ship often has the lowest hull number of its class.
Before the 1920s, naval vessels were classified according to shared characteristics.
The unofficial retro-applying of ship classes can occasionally lead to confusion. For example, while American works consistently adhere to the City- and Columbia-class monikers, works of British origin refer to the same classes as Cairo class and Tennessee class respectively, in compliance with the modern Royal Navy naming conventions.
By the time the United States entered World War II, the current naming convention was in place, though exactly how and when the practice originated remain unclear.

Merchant vessel class

Merchant ships are almost always classed by a classification society. These vessels are said to be in class when their hull, structures, machinery, and equipment conform to International Maritime Organization and MARPOL standards. Vessels out of class may be uninsurable and/or not permitted to sail by other agencies.
A vessel's class may include endorsements for the type of cargo such as "oil carrier", "bulk carrier", "mixed carrier" etc. It may also include class notations denoting special abilities of the vessel. Examples of this include an ice class, fire fighting capability, oil recovery capability, automated machinery space capability, or other special ability.