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Skjold-class Corvette
''Skjold''-class corvettes (skjold means "shield" in Norwegian) are a class of six light, superfast, stealth missile corvettes in service with the Royal Norwegian Navy. The boats were formerly classed as MTBs ( motor torpedo boats) but, from 2009, the Royal Norwegian Navy has described them as corvettes (''korvett'') because their seaworthiness is seen as comparable to corvettes, and because they do not carry torpedoes. They were built at the Umoe Mandal yard. With a maximum speed of , the ''Skjold''-class corvettes were the fastest combat ships afloat at the time of their introduction., beaten by the Abu Dhabi MAR WP-18 Interceptor. Design The ''Skjold'' design is a surface effect craft, constructed of glass fibre/carbon composite materials. Buoyancy is augmented underway by a fan-blown skirted compartment between the two rigid catamaran-type hulls. This provides an alternative solution to the planing hull/vee hull compromise: the air cushion reduces wave slam at high spee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Umoe Mandal
Umoe Mandal AS is a shipbuilding company in the Ulltveit-Moe Group. Their shipyards are based at Mandal in Norway. Founded in 1989 as Kværner Båtservice, later Kværner Mandal, and known as Umoe Mandal since 2000, the company specialises in high-speed naval vessels, mine countermeasure vessels (MCMVs) and fast patrol boats (FPBs). They supply the Royal Norwegian Navy, for whom they are currently in production with the Fast Attack Craft series ''Skjold''. The company is especially known for its expertise in the use of fibre reinforced plastic (FRP) technology in naval applications. It undertakes the design of naval and commercial vessels in FRP and other advanced composites structures for military applications, as well as shock design, stealth design, and EMI/EMC measures and weight/strength optimisation. The company also produces a range of special products in its market area, such radar stealth air intakes, carbon fibre composite centrifugal fans and, through its subsidiary ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surface-to-air Missile
A surface-to-air missile (SAM), also known as a ground-to-air missile (GTAM) or surface-to-air guided weapon (SAGW), is a missile designed to be launched from the ground or the sea to destroy aircraft or other missiles. It is one type of anti-aircraft warfare, anti-aircraft system; in modern armed forces, missiles have replaced most other forms of dedicated anti-aircraft weapons, with anti-aircraft guns pushed into specialized roles. The first attempt at SAM development took place during World War II, but no operational systems were introduced. Further development in the 1940s and 1950s led to operational systems being introduced by most major forces during the second half of the 1950s. Smaller systems, suitable for close-range work, evolved through the 1960s and 1970s, to modern systems that are man-portable. Shipborne systems followed the evolution of land-based models, starting with long-range weapons and steadily evolving toward smaller designs to provide a layered defence. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radar Absorbent Material
In materials science, radiation-absorbent material (RAM) is a material which has been specially designed and shaped to absorb incident RF radiation (also known as non-ionising radiation), as effectively as possible, from as many incident directions as possible. The more effective the RAM, the lower the resulting level of reflected RF radiation. Many measurements in electromagnetic compatibility (EMC) and antenna radiation patterns require that spurious signals arising from the test setup, including reflections, are negligible to avoid the risk of causing measurement errors and ambiguities. Introduction One of the most effective types of RAM comprises arrays of pyramid-shaped pieces, each of which is constructed from a suitably lossy material. To work effectively, all internal surfaces of the anechoic chamber must be entirely covered with RAM. Sections of RAM may be temporarily removed to install equipment but they must be replaced before performing any tests. To be suffic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anechoic Chamber
An anechoic chamber (''an-echoic'' meaning "non-reflective" or "without echoes") is a room designed to stop reflection (physics), reflections or Echo (phenomenon), echoes of either sound or electromagnetic waves. They are also often isolated from energy entering from their surroundings. This combination means that a person or detector exclusively hears direct sounds (no reverberation, reflected sounds), in effect simulating being outside in a free field. Anechoic chambers, a term coined by American acoustics expert Leo Beranek, were initially exclusively used to refer to acoustic anechoic chambers. Recently, the term has been extended to other radio frequency (RF) and sonar anechoic chambers, which eliminate reflection and external noise caused by electromagnetic waves. Anechoic chambers range from small compartments the size of household microwave ovens to ones as large as aircraft hangars. The size of the chamber depends on the size of the objects and frequency ranges bei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glass Fibre
Glass fiber ( or glass fibre) is a material consisting of numerous extremely fine fibers of glass. Glassmakers throughout history have experimented with glass fibers, but mass manufacture of glass fiber was only made possible with the invention of finer machine tooling. In 1893, Edward Drummond Libbey exhibited a dress at the World's Columbian Exposition incorporating glass fibers with the diameter and texture of silk fibers. Glass fibers can also occur naturally, as Pele's hair. Glass wool, which is one product called "fiberglass" today, was invented some time between 1932 and 1933 by Games Slayter of Owens-Illinois, as a material to be used as thermal building insulation. It is marketed under the trade name Fiberglas, which has become a genericized trademark. Glass fiber, when used as a thermal insulating material, is specially manufactured with a bonding agent to trap many small air cells, resulting in the characteristically air-filled low-density "glass wool" family of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surface Effect Ship
A surface effect ship (SES) or sidewall hovercraft is a watercraft that has both an air cushion, like a hovercraft, and twin hulls, like a catamaran. When the air cushion is in use, a small portion of the twin hulls remains in the water. When the air cushion is turned off ("off-cushion" or "hull borne"), the full weight of the vessel is supported by the buoyancy of the twin hulls. The SES has two advantages over a hovercraft for open sea operation: it is more resistant to slipping sideways when acted on by air or sea, and it can use water jets for propulsion since the inlet nozzles are always covered by water. History United States Navy The United States Navy initiated the SES model test program in 1960. By 1963, a 10-ton test craft called the XR-1 was designed and built to test the surface effect concept. The first version of the XR-1 used fixed plywood seals at the fore and aft ends of the captured air bubble section. A jet engine providing of thrust was used for main ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abu Dhabi MAR
Abu Dhabi MAR (ADM), a holding company based in Abu Dhabi, UAE; is a shipbuilding group with an international presence, and one of the leading shipbuilders in the Persian Gulf. The group was founded in 2007, and employs around 2,000 people. It specializes in the construction of frigates, mega-yachts, and shiprepairs. The docks owned by the group can handle ships up to a total length of 200 meters. The shares of the holding company are held by thPrivinvest(30%). Its managing director and CEO was Iskandar Safa, board member ). The group's order book exceeds one billion euros. History A holding company under the umbrella of Abu Dhabi MAR was founded in 200Privinvest(30%). Its principals have owned the French shipyard Constructions Mécaniques de Normandie, based in Cherbourg-en-Cotentin, France, since 1992. In 2008 Abu Dhabi MAR group entered into a shipbuilding venture �ADMShipyards located across a deep-water channel from Abu Dhabi's main shipping terminal, Port Zayed. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seakeeping
Seakeeping ability or seaworthiness is a measure of how well-suited a watercraft is to conditions when underway. A ship or boat which has good seakeeping ability is said to be very seaworthy and is able to operate effectively even in high sea states. Measure In 1976, St. Denis suggested four principal terms needed to describe a seakeeping performance. These are: *Mission: what the ship is intended to accomplish. The role of the ship while at sea. *Environment: the conditions under which the ship is operating. This can be described as sea state, wind speed, geographic region or some combination thereof. *Ship responses: the response of the ship to the environmental conditions. The responses are a function of the environment and the vessel characteristics. *Seakeeping performance criteria: the established limits for the ship's responses. These are based on the ship motions and the accelerations experienced, and include comfort criteria such as noise, vibration and sea sickness, perfo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Norwegian Navy
The Royal Norwegian Navy () is the branch of the Norwegian Armed Forces responsible for navy, naval operations of Norway, including those of the Norwegian Coast Guard. , the Royal Norwegian Navy consists of approximately 3,700 personnel (9,450 in mobilized state, 32,000 when fully mobilized) and 70 vessels, including 4 heavy frigates, 6 submarines, 14 patrol boats, 4 Minesweeper (ship), minesweepers, 4 minehunters, 1 mine detection vessel, 4 support vessels and 2 training vessels. This navy has a history dating back to 955. From 1509 to 1814, it formed part of the navy of history of the Danish navy, Denmark-Norway, also referred to as the "Common Fleet". Since 1814, the Royal Norwegian Navy has again existed as a separate navy. In Norwegian, all its naval vessels since 1946 bear the ship prefix ''KNM'', which stands for "Kongelige Norske Marine" (which translates to "Royal Norwegian Navy"); in English, these vessels are identified by the prefix ''HNoMS'', meaning "His/Her Norweg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Norwegian Language
Norwegian ( ) is a North Germanic language from the Indo-European language family spoken mainly in Norway, where it is an official language. Along with Swedish and Danish, Norwegian forms a dialect continuum of more or less mutually intelligible local and regional varieties; some Norwegian and Swedish dialects, in particular, are very close. These Scandinavian languages, together with Faroese and Icelandic as well as some extinct languages, constitute the North Germanic languages. Faroese and Icelandic are not mutually intelligible with Norwegian in their spoken form because continental Scandinavian has diverged from them. While the two Germanic languages with the greatest numbers of speakers, English and German, have close similarities with Norwegian, neither is mutually intelligible with it. Norwegian is a descendant of Old Norse, the common language of the Germanic peoples living in Scandinavia during the Viking Age. Today there are two official forms of ''written'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Link 16
Link 16 is a military tactical data link network used by NATO members and other nations, as allowed by the MIDS International Program Office (IPO). Its specification is part of the family of Tactical Data Links. Link 16 enables military aircraft, ships, and ground forces to exchange their tactical picture in near-real time; it also supports the exchange of text messages, imagery, and voice (the latter on two digital channels: 2.4 kbit/s or 16 kbit/s in any combination). It is one of the digital services of the JTIDS / MIDS in NATO's ''Standardization Agreement'' STANAG 5516. MIL-STD-6016 is the related United States Department of Defense Link 16 MIL-STD. Technical characteristics Link 16 is a TDMA-based secure, jam-resistant, high-speed digital data link that operates in the radio frequency band 960–1,215 MHz, allocated in line with the International Telecommunication Union (ITU) Radio regulations to the ''aeronautical radionavigation'' service and to the ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
