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JS Yūdachi (DD-103)
JS ''Yūdachi'' (DD-103) is the third ship of destroyers. She was commissioned on 4 March 1999. Design The hull design was completely renovated from first-generation DDs. In addition to increasing the size in order to reduce the underwater radiation noise, both superstructure and hull was inclined to reduce the radar cross-section. There is however no angled tripod mainmast like that of the American because of the heavy weather of the Sea of Japan in winter. The aft was designed like a "mini- Oranda-zaka" as with the to avoid interference between helicopters and mooring devices. Destroyers built under the First Defense Build-up Plan, including the former , adopted a unique long forecastle style called "Oranda-zaka". The engine arrangement is COGAG as same as ''Asagiri'' class, but a pair of engines are updated to Spey SM1C. And the remaining one pair are replaced by LM2500, same as ''Kongō'' class. Construction and career ''Yūdachi'' was laid down on 18 March 1996 at Sum ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mitsui Engineering & Shipbuilding
() is a Japanese heavy industries company. Despite its name, it no longer builds ships and now focuses mainly on production of high-value ship equipment such as Marine propulsion, engines and automated gantry cranes. Mitsui E&S is the largest supplier of gantry cranes in Japan with a market share of nearly 90 per cent, and its products are used at major ports such as Port of Long Beach, Long Beach, Port of Los Angeles, Los Angeles, Port of Mombasa, Mombasa, Saigon Port, Ho Chi Minh, and Port Klang, Klang. History Mitsui E&S was established in 1917 as the Shipbuilding Division of Mitsui & Co. with the first shipyard at Tamano, Okayama, Tamano. It built the first Japan-built diesel-propelled merchant ship, ''Akagisan Maru'' (:ja:赤城山丸, 赤城山丸) in 1924. With its success, it began manufacturing diesel engines under a license agreement with Burmeister & Wain in Denmark. In 1937, the shipyards became a separate entity within the Mitsui zaibatsu, Tama Shipyard. The com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sonar
Sonar (sound navigation and ranging or sonic navigation and ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, measure distances ( ranging), communicate with or detect objects on or under the surface of the water, such as other vessels. "Sonar" can refer to one of two types of technology: ''passive'' sonar means listening for the sound made by vessels; ''active'' sonar means emitting pulses of sounds and listening for echoes. Sonar may be used as a means of acoustic location and of measurement of the echo characteristics of "targets" in the water. Acoustic location in air was used before the introduction of radar. Sonar may also be used for robot navigation, and sodar (an upward-looking in-air sonar) is used for atmospheric investigations. The term ''sonar'' is also used for the equipment used to generate and receive the sound. The acoustic frequencies used in sonar systems vary from very low ( infrasonic) to e ... [...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] |
RIM-162 ESSM
The RIM-162 Evolved SeaSparrow Missile (ESSM) is a development of the RIM-7 Sea Sparrow missile used to protect ships from attacking missiles and aircraft. ESSM is designed to counter supersonic maneuvering anti-ship missiles. ESSM also has the ability to be "quad-packed" in the Mark 41 Vertical Launch System, allowing up to four ESSMs to be carried in a single cell. Design The original Sea Sparrow was an expedient design intended to provide short-range defensive fire in a system that could be deployed as rapidly as possible. The AIM-7 Sparrow was the simplest solution, as its radar guidance allowed it to be fired head-on at targets. The radar signal could be provided by mounting an aircraft radar on a trainable platform on a ship. In the years after its introduction, it was upgraded to follow improvements being made in the air-to-air Sparrow models used by the US Navy and US Air Force. The ultimate version in this line was the R model, which introduced a new dual-seeker homing sy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vertical Launching System
A vertical launching system (VLS) is an advanced system for holding and firing missiles on mobile naval platforms, such as surface ships and submarines. Each vertical launch system consists of a number of ''cells'', which can hold one or more missiles ready for firing. Typically, each cell can hold a number of different types of missiles, allowing the ship flexibility to load the best set for any given mission. Further, when new missiles are developed, they are typically fitted to the existing vertical launch systems of that nation, allowing existing ships to use new types of missiles without expensive rework. When the command is given, the missile flies straight up far enough to clear the cell and the ship, then turns onto the desired course. A VLS allows surface combatants to have a greater number of weapons ready for firing at any given time compared to older launching systems such as the Mark 13 missile launcher, Mark 13 single-arm and Mark 26 missile launcher, Mark 26 t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Torpedo Tube
A torpedo tube is a cylindrical device for launching torpedoes. There are two main types of torpedo tube: underwater tubes fitted to submarines and some surface ships, and deck-mounted units (also referred to as torpedo launchers) installed aboard surface vessels. Deck-mounted torpedo launchers are usually designed for a specific type of torpedo, while submarine torpedo tubes are general-purpose launchers, and are often also capable of deploying naval mine, mines and cruise missiles. Most modern launchers are standardized on a diameter for light torpedoes (deck mounted aboard ship) or a diameter for heavy torpedoes (underwater tubes), although Torpedo#Classes and diameters, torpedoes of other classes and diameters have been used. Submarine torpedo tube A submarine torpedo tube is a more complex mechanism than a torpedo tube on a surface ship, because the tube has to accomplish the function of moving the torpedo from the normal atmospheric pressure within the submarine into the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anti-ship Missile
An anti-ship missile (AShM or ASM) is a guided missile that is designed for use against ships and large boats. Most anti-ship missiles are of the sea-skimming variety, and many use a combination of inertial guidance and active radar homing. A large number of other anti-ship missiles use infrared homing to follow the heat that is emitted by a ship; it is also possible for anti-ship missiles to be guided by radio command all the way. Many anti-ship missiles can be launched from a variety of weapons systems including surface warships (also referred to as ship-to-ship missiles), submarines, bombers, fighter planes, patrol planes, helicopters, shore batteries, land vehicles, and, conceivably, even infantrymen firing shoulder-launched missiles. The term surface-to-surface missile (SSM) is used when appropriate. The longer-range anti-ship missiles are often called anti-ship cruise missiles. Several countries are also developing anti-ship ballistic missiles. Etymology Both ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phalanx CIWS
The Phalanx CIWS () is an automated gun-based close-in weapon system to defend military watercraft automatically against incoming threats such as aircraft, missiles, and small boats. It was designed and manufactured by the General Dynamics Corporation, Pomona Division,Thomas, Vincent C. ''The Almanac of Seapower 1987'' Navy League of the United States (1987) p.191 later a part of Raytheon. Consisting of a radar-guided Vulcan cannon mounted on a swiveling base, the Phalanx has been used by the United States Navy and the naval forces of 15 other countries. The U.S. Navy deploys it on every class of surface combat ship, except the and . Other users include the British Royal Navy, the Royal Australian Navy, the Royal New Zealand Navy, the Royal Canadian Navy, and the U.S. Coast Guard. A land variant, the LPWS (Land Phalanx Weapon System), part of the Counter Rocket, Artillery, and Mortar (C-RAM) system, was developed. It was deployed to counter rocket, artillery and mortar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
OTO Melara 76 Mm
The OTO Melara 76 mm gun, marketed as the OTO 76/62 Gun Mount, is a naval autocannon built and designed by the Italian Defense contractor, defence company OTO Melara. It is based on the OTO Melara 76/62C and evolved toward 76/62 SR and 76/62 Strales. The system is compact enough to be installed on relatively small warships. Its high rate of fire and the availability of several types of ammunition make it capable of short-range Missile defense, anti-missile Point-defence, point defence, Anti-aircraft warfare, anti-aircraft, Anti-surface warfare, anti-surface, and Fire support, ground support. Ammunition includes Armour-piercing ammunition, armour-piercing, Incendiary ammunition, incendiary, Fragmentation ammunition, directed fragmentation effects, and a guided round marketed as capable of destroying maneuvering anti-ship missiles. It can be installed in a stealth Gun turret, cupola. The OTO Melara 76 mm has been widely exported, and is in use by sixty navies. It was fa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sonar Decoy
A sonar decoy is a device for decoying sonar. One may be released from a submarine or a surface vessel. A decoy acts as false targets for human operators and/or sonar-homing weapons such as acoustic torpedoes. Many count as a type of torpedo defence. Submarine decoys The first submarine decoys were the German Bold (decoy), Bold fitted to U-boats of World War II. These were a pellet of calcium hydride in a simple metal container. On contact with sea water, the calcium hydride decomposed to produce a trail of hydrogen gas bubbles that acted as a bubble curtain and reflected ASDIC impulses to produce a false target. The container trapped hydrogen and floated, with a crude spring valve to maintain buoyancy to keep it at a constant depth. Later decoys, such as Sieglinde (decoy), Sieglinde, were motorised and could deploy their false target away from the host submarine, increasing safety. Surface ship decoys Decoys were also used by surface ships to decoy the developing acoustic to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
