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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 seriousl ... [...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 AB. 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 1820s 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 erec ... [...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". A merchant vessel has t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Somalia
Somalia, officially the Federal Republic of Somalia, is the easternmost country in continental Africa. The country is located in the Horn of Africa and is bordered by Ethiopia to the west, Djibouti to the northwest, Kenya to the southwest, the Gulf of Aden to the north, and the Indian Ocean to the east. Somalia has the longest coastline on Africa's mainland. Somalia has an estimated population of 18.1 million, of which 2.7 million live in the capital and largest city, Mogadishu. Around 85% of Somalia's residents are ethnic Somali people, Somalis. The official languages of the country are Somali language, Somali and Arabic, though Somali is the Languages of Somalia, primary language. Somalia has historic and religious ties to the Arab world. The people in Somalia are mainly Muslims, following the Sunni Islam, Sunni branch.. In antiquity, Somalia was an important commercial center. During the Middle Ages, several powerful Somali empires dominated the regional trade, including th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
3rd Naval Warfare Flotilla (Sweden)
The 3rd Naval Warfare Flotilla ( or ''3. sjöstridsflj'') is a Swedish Navy flotilla located in the county of Blekinge, active since 1983. The flotilla is located at Karlskrona Garrison and shares its location with the 1st Submarine Flotilla. History The flotilla was established on 1 January 1983 as the 4th Surface Attack Flotilla, formed from the remnants of the 1st Destroyer Flotilla and the 1st Patrol Boat Flotilla, which had been disbanded in the preceding years. The process of establishing the flotilla was problematic. There was no space available onboard any vessel within the flotilla to accommodate the headquarters, so it had to be temporarily based on land. Additionally, the financial constraints faced by the Swedish Armed Forces at the time were further complicated by efforts to digitalize the navy’s economic management. This shift to computerized systems made financial administration more difficult, as few personnel were familiar with the new technology. Organizat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radar Cross-section
Radar cross-section (RCS), denoted σ, 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 radiation transmitted and received 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 o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Signals Intelligence
Signals intelligence (SIGINT) is the act and field of 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). As classified and sensitive information is usually encrypted, signals intelligence may necessarily involve cryptanalysis (to decipher the messages). Traffic analysis—the study of who is signaling to whom and in what quantity—is also used to integrate information, and it may complement cryptanalysis. 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 transmissions. Since the ... [...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 Ocean, Indian and Pacific Ocean, Pacific oceans. Comprising over List of islands of Indonesia, 17,000 islands, including Sumatra, .... 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, 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 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 large-caliber guns, the invention and refinement of torpedoes from the 1860s onwards allowed small torpedo boats and other lighter surface vessels, submarines/submersibles, even improvised fishing boats or frogmen, and later light aircraft, to destroy large ships without the need of large guns, though somet ... [...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 (submarine), 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anti-submarine Warfare
Anti-submarine warfare (ASW, or in the 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 involve 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 instanc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soviet Submarine S-363
Soviet submarine ''S-363'' was a Soviet Navy of the Baltic Fleet. Under the designation U137 it ran aground on 27 October 1981 on the south coast of Sweden, approximately from Karlskrona, one of the largest Swedish naval bases. U137 was the unofficial Swedish name for the vessel, as the Soviets then considered names of most of their submarines to be classified and did not disclose them. The ensuing international incident is often referred to as the Whiskey on the rocks incident. Standoff In October 1981, the Soviet submarine ''S-363'' accidentally hit an underwater rock about from the South Coast Naval Base at Karlskrona and surfaced within Swedish waters.. The boat's presence coincided with a Swedish naval exercise, which was testing new equipment in the area. Swedish naval forces reacted to the breach of sovereignty by sending an unarmed naval officer aboard the boat to meet the captain and demand an explanation. The captain initially claimed that simultaneous failure ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Territorial Waters
Territorial waters are informally an area of water where a sovereign state has jurisdiction, including internal waters, the territorial sea, the contiguous zone, the exclusive economic zone, and potentially the extended continental shelf (these components are sometimes collectively called the maritime zones). In a narrower sense, the term is often used as a synonym for the territorial sea. Vessels have different rights and duties when passing through each area defined by the United Nations Convention on the Law of the Sea (UNCLOS), one of the most ratified treaties. States cannot exercise their jurisdiction in waters beyond the exclusive economic zone, which are known as the high seas. Baseline Normally, the baseline is the low-water line along the coast as marked on large-scale charts that the coastal state recognizes. This is either the low-water mark closest to the shore or an unlimited distance from permanently exposed land, provided that some portion of elevations ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
