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Stockholm-class Corvette
The ''Stockholm'' class is a pair of warships of the Swedish Navy. Built as corvettes in Karlskrona 1984–1985, they are armed with four RBS15 anti-ship missiles, one 57 mm cannon and several machine guns. In 2017 the two units in the class were rebuilt and are now serving as patrol boats. The option to carry anti-ship missiles does however remain. History The ''Stockholm'' class started as a study for a ship with increased endurance, a project called ''Ytattack-81'' (Surface combatant-81), which was built on the torpedo boats of the Spica and Spica II classes, but with an increased displacement from . The engine was to be a CODAG-concept, two diesels and one gas turbine. However, the class looked to become just another desktop project. In the early 1980s a series of submarine incidents occurred within Swedish territorial waters, the most famous of which was ''U 137'' which ran aground outside Karlskrona in 1981. These incidents showed that the Swedish Navy was seriously l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kockums
Saab Kockums AB is a shipyard headquartered in Malmö, Sweden, owned by the Swedish defence company Saab Group. Saab Kockums AB is further operational in Muskö, Docksta, and Karlskrona. While having a history of civil vessel construction, Kockums' most renowned activity is the fabrication of military corvettes and submarines. Kockums worked with Northrop Grumman and Howaldtswerke-Deutsche Werft (HDW) to offer a ''Visby''-class corvette derivative in the American Focused Mission Vessel Study, a precursor to the Littoral Combat Ship program. It competed with several other concepts, including Norway's Skjold class (part of a Raytheon led group). History Kockums during the 19th century During the 1820:s the Kockums family established themselves as businesspeople in Malmö. Frans Henrik Kockum built a large fortune through an investment in tobacco production. Thanks to this he was able to purchase a large part of land 1838 south of Malmö, and between 1840 and 1841 he erect ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Combined Diesel And Gas
Combined diesel and gas (CODAG) is a type of propulsion system for ships that need a maximum speed that is considerably faster than their cruise speed, particularly warships like modern frigates or corvettes. Pioneered by Germany with the , a CODAG system consists of diesel engines for cruising and gas turbines that can be switched on for high-speed transits. In most cases the difference of power output from diesel engines alone to diesel and turbine power combined is too large for controllable-pitch propellers to limit the rotations so that the diesels cannot continue to operate without changing the gear ratios of their transmissions. Because of that, special multi-speed gearboxes are needed. This contrasts to combined diesel or gas (CODOG) systems, which couple the diesels with a simple, fixed ratio gearbox to the shaft, but disengage the diesel engines when the turbine is powered up. For an example the new CODAG-propelled s of the Royal Norwegian Navy, the gear ratio for t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karlskrona Naval Base
The Karlskrona naval base ( sv, Karlskrona örlogsbas) is the largest naval base of the Swedish Navy. Located in Blekinge in southern Sweden, the base has close ties with the city of Karlskrona. It has an exceptionally well-sheltered location: arcs of islands provide a strong defense not only from the sea but also from land attacks. Two of Sweden's three naval warfare flotillas are based there. It contains the Marinmuseum and the Ropewalk, the longest wooden building in the country. History After Sweden and Denmark ceased hostilities after the Scanian War (1675–1679), King Charles XI of Sweden made a reconnaissance trip in the eastern part of the Blekinge archipelago. The king decreed the construction of a city named "Carlscroona" on the island of Trossön. The major reason for its establishment was to provide the Swedish Navy with a permanent base closer to Denmark, which throughout the 17th century had been the foremost enemy of Sweden. In addition, a shipyard was needed for b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Piracy In Somalia
Piracy off the coast of Somalia occurs in the Gulf of Aden, Guardafui Channel and Somali Sea, in Somali territorial waters and other surrounding areas and has a long and troubled history with different perspectives from different communities. It was initially a threat to international fishing vessels, expanding to international shipping since the Consolidation of states within Somalia (1998–2006), consolidation of states phase of the Somali Civil War around 2000. Somali waters have high fisheries production potential, but the sustainability of those fisheries is compromised by the presence of foreign fishing vessels, many of them fishing illegally. The Somali domestic fishing sector is small and poorly developed, whereas foreign vessels have fished in Somali waters for at least seven decades. Some foreign vessels and their crew have been viewed by Somali artisanal fishers as a threat to their traditional livelihoods. Many foreign vessels directly compete for fish, reducing fis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Somalia
Somalia, , Osmanya script: 𐒈𐒝𐒑𐒛𐒐𐒘𐒕𐒖; ar, الصومال, aṣ-Ṣūmāl officially the Federal Republic of SomaliaThe ''Federal Republic of Somalia'' is the country's name per Article 1 of thProvisional Constitution, (; ), is a country in the Horn of Africa. The country is bordered by Ethiopia to the west, Djibouti to the northwest, the Gulf of Aden to the north, the Indian Ocean to the east, and Kenya to the southwest. Somalia has the longest coastline on Africa's mainland. Its terrain consists mainly of plateaus, plains, and highlands. Hot conditions prevail year-round, with periodic monsoon winds and irregular rainfall. Somalia has an estimated population of around million, of which over 2 million live in the capital and largest city Mogadishu, and has been described as Africa's most culturally homogeneous country. Around 85% of its residents are ethnic Somalis, who have historically inhabited the country's north. Ethnic minorities are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
3rd Naval Warfare Flotilla (Sweden)
3rd Naval Warfare Flotilla ( sv, Tredje sjöstridsflottiljen or ''3. sjöstridsflj'') of the Swedish Fleet was founded in 2005 when the former minelayer and surface flotillas joined together. The flotilla's home base is in Karlskrona, Blekinge and is a part of the Karlskrona naval base. The flotilla mostly deploy ships in international missions today. Organization The flotilla is split into three different divisions. 31st Corvett Division * patrol boat of ''Stockholm''-class * patrol boat of ''Stockholm''-class * corvette of ''Visby''-class * corvette of ''Visby''-class * corvette of ''Visby''-class *3 patrol boats of the ''Tapper''-class 33rd Minesweeper Division *2 minelayer ship of ''Koster''-class. *1 ship of ''Spårö''-class 34th Support Division * The former missile boat division was stationed in the flotilla until September 2005 when all the ships was decommissioned. Heraldry and traditions Coat of arms The coat of arms of the 3rd Surface Attack Flotilla (''T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radar Cross-section
Radar cross-section (RCS), also called radar signature, is a measure of how detectable an object is by radar. A larger RCS indicates that an object is more easily detected. An object reflects a limited amount of radar energy back to the source. The factors that influence this include: *the material with which the target is made; *the size of the target relative to the wavelength of the illuminating radar signal; *the absolute size of the target; *the incident angle (angle at which the radar beam hits a particular portion of the target, which depends upon the shape of the target and its orientation to the radar source); *the reflected angle (angle at which the reflected beam leaves the part of the target hit; it depends upon incident angle); *the polarization of the transmitted and the received radiation with respect to the orientation of the target. While important in detecting targets, strength of emitter and distance are not factors that affect the calculation of an RCS becaus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Signals Intelligence
Signals intelligence (SIGINT) is intelligence-gathering by interception of ''signals'', whether communications between people (communications intelligence—abbreviated to COMINT) or from electronic signals not directly used in communication (electronic intelligence—abbreviated to ELINT). Signals intelligence is a subset of intelligence collection management. As classified and sensitive information is usually encrypted, signals intelligence in turn involves the use of cryptanalysis to decipher the messages. Traffic analysis—the study of who is signaling whom and in what quantity—is also used to integrate information again. History Origins Electronic interceptions appeared as early as 1900, during the Boer War of 1899–1902. The British Royal Navy had installed wireless sets produced by Marconi on board their ships in the late 1890s, and the British Army used some limited wireless signalling. The Boers captured some wireless sets and used them to make vital transmis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elma ASW-600
The Elma ASW-600 is an anti-submarine warfare system designed by the Saab Group and used by the Royal Swedish Navy. It is designated in Antiubåts-granatkastarsystemen 83 in Sweden, and was previously called the Elma LLS-920. History The ASW-600 was initially designed in the 1980s. In 2018, the Defence Materiel Administration announced it would be reintroducing the system aboard ''Koster''-class mine countermeasures vessels. Export In 1993, the Swedish Parliamentary Advisory Council on the Export of War Materials approved the export of the ASW-600 to Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guine .... References Anti-submarine mortars Saab {{Sweden-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Torpedo
A modern torpedo is an underwater ranged weapon launched above or below the water surface, self-propelled towards a target, and with an explosive warhead designed to detonate either on contact with or in proximity to the target. Historically, such a device was called an automotive, automobile, locomotive, or fish torpedo; colloquially a ''fish''. The term ''torpedo'' originally applied to a variety of devices, most of which would today be called naval mine, mines. From about 1900, ''torpedo'' has been used strictly to designate a self-propelled underwater explosive device. While the 19th-century battleship had evolved primarily with a view to engagements between armored warships with naval artillery, large-caliber guns, the invention and refinement of torpedoes from the 1860s onwards allowed small torpedo boats and other lighter surface combatant , surface vessels, submarines/submersibles, even improvised fishing boats or frogmen, and later light aircraft, to destroy large shi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Towed Array Sonar
A towed array sonar is a system of hydrophones towed behind a submarine or a surface ship on a cable. Trailing the hydrophones behind the vessel, on a cable that can be kilometers long, keeps the array's sensors away from the ship's own noise sources, greatly improving its signal-to-noise ratio, and hence the effectiveness of detecting and tracking faint contacts, such as quiet, low noise-emitting submarine threats, or seismic signals. A towed array offers superior resolution and range compared with hull mounted sonar. It also covers the baffles, the blind spot of hull mounted sonar. However, effective use of the system limits a vessel's speed and care must be taken to protect the cable from damage. History During World War I, a towed sonar array known as the "Electric Eel" was developed by Harvey Hayes, a U.S. Navy physicist. This system is believed to be the first towed sonar array design. It employed two cables, each with a dozen hydrophones attached. The project was discontin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anti-submarine Warfare
Anti-submarine warfare (ASW, or in older form A/S) is a branch of underwater warfare that uses surface warships, aircraft, submarines, or other platforms, to find, track, and deter, damage, or destroy enemy submarines. Such operations are typically carried out to protect friendly shipping and coastal facilities from submarine attacks and to overcome blockades. Successful ASW operations typically involved a combination of sensor and weapon technologies, along with effective deployment strategies and sufficiently trained personnel. Typically, sophisticated sonar equipment is used for first detecting, then classifying, locating, and tracking a target submarine. Sensors are therefore a key element of ASW. Common weapons for attacking submarines include torpedoes and naval mines, which can both be launched from an array of air, surface, and underwater platforms. ASW capabilities are often considered of significant strategic importance, particularly following provocative instan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
