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A sister ship is a ship of the same class or of virtually identical design to another ship. Such vessels share a nearly identical hull and superstructure layout, similar size, and roughly comparable features and equipment. They often share a common naming theme, either being named after the same type of thing or person (places, constellations, heads of state) or with some kind of alliteration. Typically the ship class is named for the first ship of that class. Often, sisters become more differentiated during their service as their equipment (in the case of naval vessels, their armament) are separately altered.
For instance, the U.S. warships USS Iowa, USS New Jersey, USS Missouri, and USS Wisconsin are all sister ships, each being an Iowa-class battleship.
Perhaps the most famous sister ships were the White Star Line's Olympic-class ocean liners, consisting of RMS Olympic, RMS Titanic and HMHS Britannic. As with some other liners, the sisters worked as running mates. [1] Other sister ships include the Royal Caribbean International's Explorer of the Seas and Adventure of the Seas.
Half-sister refers to a ship of the same class but with some significant differences. One example of half-sisters are the First World War-era British Courageous-class battlecruisers where the first two ships had four 15-inch (381 mm) guns, but the last ship, HMS Furious, had two 18-inch (457 mm) guns instead. All three were converted into aircraft carriers, with Furious again differing from her half-sisters by initially being flush-decked and later by having a much smaller island. Another example is the American Essex-class aircraft carriers of the Second World War that came in "long-hull" and "short-hull" versions.
Notable airships include the American sister ships USS Akron and USS Macon, and the German Hindenburg-class airship's Hindenburg and Graf Zeppelin II .
The generally accepted commercial distinctions of a "sister ship" are the following:
The critical overriding criterion is having the same hull design. For example, the popular TESS-57 standard design built by Tsunishi Shipbuilding are built in Japan, China, and the Philippines. All the ships of this design are classed as sister ships.
The International Maritime Organization defined sister ship in IMO resolution MSC/Circ.1158 in 2006. Criteria included these:
RMS Olympic was a British ocean liner and the lead ship of the White Star Line's trio of Olympic-class liners. Olympic had a career spanning 24 years from 1911 to 1935, in contrast to her short-lived sister ships, Titanic and Britannic. This included service as a troopship during the First World War, which gained her the nickname "Old Reliable", and during which she rammed and sank the U-boat U-103. She returned to civilian service after the war, and served successfully as an ocean liner throughout the 1920s and into the first half of the 1930s, although increased competition, and the slump in trade during the Great Depression after 1930, made her operation increasingly unprofitable. Olympic was withdrawn from service and sold for scrapping on 12 April 1935 which was completed in 1937.
HMHSBritannic was the third and final vessel of the White Star Line's Olympic class of steamships and the second White Star ship to bear the name Britannic. She was the youngest sister of the RMS Olympic and the RMS Titanic and was intended to enter service as a transatlantic passenger liner. She was operated as a hospital ship from 1915 until her sinking near the Greek island of Kea, in the Aegean Sea, in November 1916. At the time she was the largest hospital ship in the world.
An ocean liner is a type of passenger ship primarily used for transportation across seas or oceans. Ocean liners may also carry cargo or mail, and may sometimes be used for other purposes. Only one ocean liner remains in service today.
A passenger ship is a merchant ship whose primary function is to carry passengers on the sea. The category does not include cargo vessels which have accommodations for limited numbers of passengers, such as the ubiquitous twelve-passenger freighters once common on the seas in which the transport of passengers is secondary to the carriage of freight. The type does however include many classes of ships designed to transport substantial numbers of passengers as well as freight. Indeed, until recently virtually all ocean liners were able to transport mail, package freight and express, and other cargo in addition to passenger luggage, and were equipped with cargo holds and derricks, kingposts, or other cargo-handling gear for that purpose. Only in more recent ocean liners and in virtually all cruise ships has this cargo capacity been eliminated.
The White Star Line was a British shipping line. Founded out of the remains of a defunct packet company, it gradually rose up to become one of the most prominent shipping companies in the world, providing passenger and cargo services between the British Empire and the United States. While many other shipping lines focused primarily on speed, White Star branded their services by focusing more on providing comfortable passages for both upper class travellers and immigrants.
USS Charger (CVE-30) was an escort carrier of the United States Navy during World War II converted from a commercial C3-P&C cargo/passenger liner hull built as Rio de la Plata intended for the Moore-McCormack company's American Republics Line serving the east coast of South America. The ship was requisitioned for conversion to an escort carrier type intended for Royal Navy use and initially commissioned as HMS Charger (D27). Days later the transfer was rescinded with the ship returning to U.S. Navy control to become USS Charger which operated throughout the war as a training ship on the Chesapeake Bay with two ferry missions to Bermuda and Guantánamo Bay, Cuba.
RMS Aquitania was an ocean liner of the Cunard Line in service from 1914 to 1950. She was designed by Leonard Peskett and built by John Brown & Company in Clydebank, Scotland. She was launched on 21 April 1913 and sailed on her maiden voyage from Liverpool to New York on 30 May 1914. She was given the title of Royal Mail Ship (RMS) like many other Cunard ocean liners since she carried the royal mail on many of her voyages. Aquitania was the third in Cunard Line's grand trio of express liners, preceded by RMS Mauretania and RMS Lusitania, and was the last surviving four-funnelled ocean liner. Shortly after Aquitania entered service, the First World War broke out, during which she was first converted into an auxiliary cruiser before being used as a troop transport and a hospital ship, notably as part of the Dardanelles Campaign.
A troopship is a ship used to carry soldiers, either in peacetime or wartime. Troopships were often drafted from commercial shipping fleets, and were unable to land troops directly on shore, typically loading and unloading at a seaport or onto smaller vessels, either tenders or barges.
A cargo ship or freighter is a merchant ship that carries cargo, goods, and materials from one port to another. Thousands of cargo carriers ply the world's seas and oceans each year, handling the bulk of international trade. Cargo ships are usually specially designed for the task, often being equipped with cranes and other mechanisms to load and unload, and come in all sizes. Today, they are almost always built of welded steel, and with some exceptions generally have a life expectancy of 25 to 30 years before being scrapped.
Oceanic was the planned name of an unfinished ocean liner that was partially built by Harland and Wolff for the White Star Line. It would have been the third ship bearing the name Oceanic, after the one of 1870 and the one of 1899. It was envisaged in 1926, with the idea of modernizing the transatlantic service of the company. With the arrival of Lord Kylsant at the head of the company, the planned size of the project increased, until it became that of a large ship destined to be the first to exceed the symbolic limit of 1,000 feet (305 m) in length and 30 knots in speed.
Violet Constance Jessop was an Irish-Argentine ocean liner stewardess and nurse in the early 20th century. Jessop is most well known for having survived the sinking of both the RMS Titanic in 1912 and her sister ship the HMHS Britannic in 1916, as well as having been onboard the eldest of the three sister ships, the RMS Olympic, when it collided with the British warship HMS Hawke in 1911.
RMS Majestic was a British Ocean liner working on the White Star Line’s North Atlantic run, originally launched in 1914 as the Hamburg America Liner SS Bismarck. At 56,551 gross register tons, she was the largest ship ever operated by the White Star Line under its own flag and the largest ship in the world until completion of SS Normandie in 1935.
Type C3-class ships were the third type of cargo ship designed by the United States Maritime Commission (MARCOM) in the late 1930s. As it had done with the Type C1 ships and Type C2 ships, MARCOM circulated preliminary plans for comment. The design presented was not specific to any service or trade route, but was a general purpose ship that could be modified for specific uses. A total of 162 C3 ships were built from 1939 to 1946.
The Olympic-class ocean liners were a trio of British ocean liners built by the Harland & Wolff shipyard for the White Star Line during the early 20th century. They were Olympic (1911), Titanic (1912) and Britannic (1914). All three were designed to be the largest and most luxurious passenger ships at that time, designed to give White Star an advantage in the transatlantic passenger trade.
LV-117 was a lightvessel of the United States Lighthouse Service. Launched in 1931, she operated as the Nantucket lightship south of Nantucket Shoals. Moored south of Nantucket Island, Massachusetts, the lightship was at the western part of the transatlantic shipping lane and the first lightship encountered by westbound liners approaching New York Harbor. On May 15, 1934, one of these liners, RMS Olympic, rammed and sank LV-117, killing seven of her crew.
A four-funnel liner, also known as a four-stacker, is an ocean liner with four funnels.
Alexander Montgomery Carlisle, PC brother-in-law to Viscount Pirrie, was one of the men involved with designing the Olympic-class ocean liners in the shipbuilding company Harland and Wolff. His main area of responsibility was the ships' safety systems such as the watertight compartments and lifeboats. As a Privy Councillor, he was known as "The Right Honorable".
The Type R ship is a United States Maritime Administration (MARAD) designation for World War II refrigerated cargo ship, also called a reefer ship. The R type ship was used in World War II, Korean War, Vietnam War and the Cold War. Type R ships were used to transport perishable commodities which require temperature-controlled transportation, such as fruit, meat, fish, vegetables, dairy products and other foods. The US Maritime Commission ordered 41 new refrigerated ships for the US Navy. Because of the difficulty of building refrigerated ships only two were delivered in 1944, and just 26 were delivered in 1945 and the remainder in 1946–48. The 41 R type ships were built in four groups. Two of design types were modified type C1 ships and two were modified type C2 ships. The United Fruit Company operated many of the R type ships in World War II. The type R2-S-BV1 became the US Navy Alstede-class stores ship and the type R1-M-AV3 became the US Navy Adria-class stores ship.
Albina Engine & Machine Works was a shipyard along the Willamette River in Portland, Oregon, United States. It was located in the Albina area of Portland along N. River Street and N. Loring Street. Albina Engine & Machine Works was founded in 1904. The shipyard produced a number of freighters during World War I, but operated mainly as a repair yard during the 1920s and 1930s. The Albina yard expanded its workforce and production during Portland's World War II shipbuilding boom. It specialized in producing subchasers, vessels designed to combat German U-boats. Albina Engine & Machine Works also built Landing Craft Support boats and cargo ships. Business declined in the post-war years, and Albina Engine & Machine Works was sold to the Dillingham Corporation around 1971.
Type C8-class ships are a type of Heavy Lift Barge Carrier. Type C8 ships were the 8th type of ship designed by the United States Maritime Commission (MARCOM) in the late 1960s. As done with the Type C1 ships and Type C2 ships, MARCOM circulated preliminary plans for comment. The design presented was not specific to any service or trade route. Type C8 ships measuring 876 feet (267 m) from stem to stern, and designed to make 16.2 knots.