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Challenger-class Cruiser
The ''Challenger''-class cruisers were a pair of second-class protected cruisers built for the Royal Navy in the first decade of the 20th century. One ship, , was later transferred to the Royal Australian Navy. Design and description The ''Challenger''-class cruisers were essentially repeats of the previous Highflyer-class cruiser, ''Highflyer'' class, albeit with more powerful propulsion machinery. They were designed to Displacement (ship), displace . The ships had a length between perpendiculars of , a beam (nautical), beam of and a draft (ship), draught of . Their crew consisted of 490 officers and other ranks (UK), other ranks.Friedman 2012, p. 336 The ships were powered by two 4-cylinder Marine steam engine#Triple or multiple expansion, triple-expansion steam engines, each driving one shaft, using steam provided by 18 Babcock & Wilcox boiler, Babcock & Wilcox () or Dürr boiler, Dürr (''Encounter'') water-tube boilers. These boilers were heavier and bulkier, but more powe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protected Cruiser
Protected cruisers, a type of naval cruiser of the late-19th century, gained their description because an armoured deck offered protection for vital machine-spaces from fragments caused by shells exploding above them. Protected cruisers resembled armored cruisers, which had in addition a belt of armour along the sides. Evolution From the late 1850s, navies began to replace their fleets of wooden ships-of-the-line with armoured ironclad warships. However, the frigates and sloops which performed the missions of scouting, commerce raiding and trade protection remained unarmoured. For several decades, it proved difficult to design a ship which had a meaningful amount of protective armour but at the same time maintained the speed and range required of a "cruising warship". The first attempts to do so, armored cruisers like , proved unsatisfactory, generally lacking enough speed for their cruiser role. During the 1870s the increasing power of armour-piercing shells made armou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Displacement (ship)
The displacement or displacement tonnage of a ship is its weight. As the term indicates, it is measured indirectly, using Archimedes' principle, by first calculating the volume of water displaced by the ship, then converting that value into weight. Traditionally, various measurement rules have been in use, giving various measures in long tons. Today, tonnes are more commonly used. Ship displacement varies by a vessel's degree of load, from its empty weight as designed (known as "lightweight tonnage") to its maximum load. Numerous specific terms are used to describe varying levels of load and trim, detailed below. Ship displacement should not be confused with measurements of volume or capacity typically used for commercial vessels and measured by tonnage: net tonnage and gross tonnage. Calculation The process of determining a vessel's displacement begins with measuring its draft.George, 2005. p.5. This is accomplished by means of its "draft marks" (or "load lines"). A mer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Forecastle
The forecastle ( ; contracted as fo'c'sle or fo'c's'le) is the upper deck of a sailing ship forward of the foremast, or, historically, the forward part of a ship with the sailors' living quarters. Related to the latter meaning is the phrase " before the mast" which denotes anything related to ordinary sailors, as opposed to a ship's officers. History and design In medieval shipbuilding, a ship of war was usually equipped with a tall, multi-deck castle-like structure in the bow of the ship. It served as a platform for archers to shoot down on enemy ships, or as a defensive stronghold if the ship were boarded. A similar but usually much larger structure, called the aftcastle, was at the aft end of the ship, often stretching all the way from the main mast to the stern. Having such tall upper works on the ship was detrimental to sailing performance. As cannons were introduced and gunfire replaced boarding as the primary means of naval combat during the 16th century, the medieval ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
QF 6 Inch Mk I - III Naval Gun
QF may stand for: * Qantas, an airline of Australia (IATA code QF) * Qatar Foundation, a private, chartered, non-profit organization in the state of Qatar * Quality factor, in physics and engineering, a measure of the "quality" of a resonant system * Quick-firing gun, a sort of artillery piece * Quiverfull, a movement of Christians who eschew all forms of birth control * A gun breech that uses metallic cartridges (see British ordnance terms#QF) * Quds Force The Quds Force ( fa, نیروی قدس, niru-ye qods, Jerusalem Force) is one of five branches of Iran's Islamic Revolutionary Guard Corps (IRGC) specializing in unconventional warfare and military intelligence operations. U.S. Army's Iraq War ... an expeditionary warfare unit of IRGC {{disambig fr:QF ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quick-firing Gun
A quick-firing or rapid-firing gun is an artillery piece, typically a gun or howitzer, which has several characteristics which taken together mean the weapon can fire at a fast rate. Quick-firing was introduced worldwide in the 1880s and 1890s and had a marked impact on war both on land and at sea. Characteristics The characteristics of a quick-firing artillery piece are: *A breech-loading weapon with a breech mechanism that allows rapid reloading *Single-part cased ammunition, i.e. a cartridge containing both shell and propellant *Recoil buffers to limit recoil, so the barrel can quickly return to the same position after firing *The use of smokeless powder – nitrocellulose, nitroglycerine, or cordite – which create far less smoke than gunpowder, meaning that gun crews could still see their target These innovations, taken together, meant that the quick-firer could fire aimed shells much more rapidly than an older weapon. For instance, an Elswick Ordnance Company 4.7-inch gun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Trials
A sea trial is the testing phase of a watercraft (including boats, ships, and submarines). It is also referred to as a "shakedown cruise" by many naval personnel. It is usually the last phase of construction and takes place on open water, and it can last from a few hours to many days. Sea trials are conducted to measure a vessel's performance and general seaworthiness. Testing of a vessel's speed, maneuverability, equipment and safety features are usually conducted. Usually in attendance are technical representatives from the builder (and from builders of major systems), governing and certification officials, and representatives of the owners. Successful sea trials subsequently lead to a vessel's certification for commissioning and acceptance by its owner. Although sea trials are commonly thought to be conducted only on new-built vessels (referred by shipbuilders as 'builders trials'), they are regularly conducted on commissioned vessels as well. In new vessels, they are used t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Director Of Naval Construction
The Director of Naval Construction (DNC) also known as the Department of the Director of Naval Construction and Directorate of Naval Construction and originally known as the Chief Constructor of the Navy was a senior principal civil officer responsible to the Board of Admiralty for the design and construction of the warships of the Royal Navy. From 1883 onwards he was also head of the Royal Corps of Naval Constructors, the naval architects who staffed his department from 1860 to 1966. The (D.N.C.'s) modern equivalent is Director Ships in the Defence Equipment and Support organisation of the Ministry of Defence. History The post evolved from the office of the ''Assistant Surveyor of the Navy'' (1832-1859) In 1860 the ''Assistant Surveyor'' was renamed ''Chief Constructor'' the post lasted until 1875 when it was renamed to the ''Director of Naval Construction''. The chief constructor was originally head of the Royal Corps of Naval Constructors and members of the corps were respons ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Henry White
Sir William Henry White, (2 February 1845 – 27 February 1913) was a prolific British warship designer and Chief Constructor at the Admiralty. Biography White was born in Devonport, the son of Robert White, a currier, and his wife, Jane Matthews. He became an apprentice at the naval dockyard there in 1859. In 1863, he obtained a scholarship to enter the newly formed Royal School of Naval Architecture in South Kensington, in London. After his apprenticeship he worked for the Admiralty on specifications and calculations for new ships, and became secretary to the then Chief Constructor of the Admiralty, Edward Reed, until the latter's resignation on 9 July 1870. He was then appointed instructor on naval design at the Royal School of Naval Architecture, and in 1872 became secretary of the Council of Construction which oversaw all Royal Navy ship construction. From 1872–1873 he worked at Pembroke and Portsmouth Dockyards. In March 1875 he was promoted to Assistant Co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Belleville Boiler
There have been a vast number of designs of steam boiler, particularly towards the end of the 19th century when the technology was evolving rapidly. A great many of these took the names of their originators or primary manufacturers, rather than a more descriptive name. Some large manufacturers also made boilers of several types. Accordingly, it is difficult to identify their technical aspects from merely their name. This list presents these known, notable names and a brief description of their main characteristics. See also * Glossary of boiler terminology Boilers for generating steam or hot water have been designed in countless shapes, sizes and configurations. An extensive terminology has evolved to describe their common features. This glossary provides definitions for these terms. Terms which re ... A B C D E F G H I J K L M N O P R S T V W Y References *{{cite book , title=Marine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dürr Boiler
A Field-tube boiler (also known as a bayonet tube) is a form of water-tube boiler where the water tubes are single-ended. The tubes are closed at one end, and they contain a concentric inner tube. Flow is thus separated into the colder inner flow down the tube and the heated flow upwards through the outer sleeve. As Field tubes are thus dependent on thermo-syphon flow ''within'' the tube, they must thus always have some vertical height to encourage the flow. In most designs they are mounted near-vertically, to encourage this. They are named after Edward Field, their inventor, and were originally developed for steam fire-engines where speed of raising steam was important. More recently, Field-tube boilers have been most widely used by French manufacturers, either for small vertical boilers, or as a marine boiler. The use of this type of Field tube has also been researched for the transfer of heat from nuclear reactors, vacuum condensers and heat exchangers. The thimble-tube boi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Babcock & Wilcox Boiler
A high pressure watertube boiler (also spelled water-tube and water tube) is a type of boiler in which water circulates in tubes heated externally by the fire. Fuel is burned inside the furnace, creating hot gas which boils water in the steam-generating tubes. In smaller boilers, additional generating tubes are separate in the furnace, while larger utility boilers rely on the water-filled tubes that make up the walls of the furnace to generate steam. The heated water/steam mixture then rises into the steam drum. Here, saturated steam is drawn off the top of the drum. In some services, the steam passes through tubes in the hot gas path, (a superheater) to become superheated. Superheated steam is defined as steam that is heated above the boiling point at a given pressure. Superheated steam is a dry gas and therefore is typically used to drive turbines, since water droplets can severely damage turbine blades. Saturated water at the bottom of the steam drum returns to the lower dr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Other Ranks (UK)
Other ranks (ORs) in the Royal Marines, British Army, Royal Air Force, and in the armies and air forces of many other Commonwealth countries and the Republic of Ireland, are those personnel who are not commissioned officers, usually including non-commissioned officers (NCOs). In the Royal Navy, these personnel are called " ratings" rather than "other ranks". Non-commissioned member is the equivalent term for the Canadian Armed Forces. Colloquially, members of the other ranks are known as "rankers". The term is often considered to exclude warrant officers, and occasionally also excludes NCOs. Formally, a regiment consists of the "officers, warrant officers, non-commissioned officers and men" or the "officers, warrant officers and other ranks". British other ranks Notes See also * British Army other ranks rank insignia * Royal Navy ratings rank insignia * RAF other ranks The term used in the Royal Air Force (RAF) to refer to all ranks below commissioned officer l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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