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Wake-homing
Wake homing is a torpedo Guidance system, guidance technique based on the Wake (physics), wake trajectory left behind a moving target. The torpedo is fired to cross behind the stern of the target ship, through the wake. As it does so, it uses sonar to look for changes in the water caused by the passage of the ship, such as small air bubbles. When these are detected, the torpedo turns toward the ship. It then follows a zig-zag course, turning when it detects the outer edge of the wake, to keep itself in the wake while moving forward. This will eventually bring it to the stern of the ship, where its warhead can do the most damage to propulsion and steering. Advantages and disadvantages The system is difficult to jam, but it can be distracted by other ships crossing the wake. In 2013, the US Navy tested prototypes of a system known as the Countermeasure Anti-Torpedo (CAT), which had been designed to intercept and destroy the incoming torpedo. Deployment of the system did not proce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Torpedoes
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] |
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] |
Type 53 Torpedo
Type 53 is the common name for a family of 53 cm (21 inch) torpedoes manufactured in Russia, starting with the 53-27 torpedo and continuing to the modern UGST (Fizik-1), which is being replaced by the Futlyar. With the exception of the UGST which uses Mark 48 style monopropellants, Soviet 53 cm torpedoes generally use electric power (since middle of World War II), or kerosene mixed with various oxidizers for propulsion. Russian torpedoes are often named descriptively for their characteristics – examples include "acoustic homing" or "electric torpedo", all in Russian acronyms. History Early history Model 53-27 (1927) with of TNT was developed domestically in the so-called , and it had a poor range at . In 1932 USSR bought in Italy several types of torpedoes, and the model of Whitehead plant in Fiume (in the Soviet Union it was designated 53F) was considered superior. After adapting several features from the latter in unsuccessful 53-36 the decision was made to copy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Refraction Index
In optics, the refractive index (or refraction index) of an optical medium is a dimensionless number that gives the indication of the light bending ability of that medium. The refractive index determines how much the path of light is bent, or refracted, when entering a material. This is described by Snell's law of refraction, , where ''θ''1 and ''θ''2 are the angle of incidence and angle of refraction, respectively, of a ray crossing the interface between two media with refractive indices ''n''1 and ''n''2. The refractive indices also determine the amount of light that is reflected when reaching the interface, as well as the critical angle for total internal reflection, their intensity ( Fresnel's equations) and Brewster's angle. The refractive index can be seen as the factor by which the speed and the wavelength of the radiation are reduced with respect to their vacuum values: the speed of light in a medium is , and similarly the wavelength in that medium is , where '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roketsan Akya
Akya is a new-generation heavyweight torpedo developed by Roketsan for the Turkish Navy. As of 2021, its tests completed, and it went in serial production. "Akya" is the Turkish name of Leerfish. History The heavyweight torpedo project was initiated by the ArMerKom ("Research Center Command") of the Turkish Navy in 2009. Roketsan was signed for the realization. The serial production of Akya started in 2021 after the test firings successfully completed in 2020, which began by July 2013. It is planned that the ''Reis''-class, ''Preveze''-class and ''Gür''-class submarines will be eqipped with Akya. It will replace the torpedoes of type Mk 14, Mk 23, Mk 24 (Tigerfish) Mod.2 , Mk 37 Mod.2 & Mod.3 and SST-4 Mod.0. Features Powered by a brushless DC electric motor and counter-rotating propellers using high-energy electrochemical batteries, Akya is able to achieve a speed exceeding and a range of more than . It has a proximity sensor and an underwater shock-insensitive warhe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DM2A4
DM2A4 Seehecht (export designation "''SeaHake mod 4''" ) is the latest heavyweight torpedo developed by Atlas Elektronik for the German Navy, as a further update of DM2 (Deutsches Modell 2) torpedo which was released in 1976. Description Being the successor of the DM2A3, it features an advanced electrical propulsion system and a fiber optic cable for torpedo guidance and communication, which, in conjunction with advanced signals processing and mission logic, makes the torpedo largely countermeasure resistant. The DM2A4/SeaHake mod 4 is the first torpedo ever to be guided by a fiber optic wire. With a fully digital system architecture, increased range and speed and its new conformal array sonar with a very wide panoramic sensor angle as well as the additional wake homing sensor, the DM2A4/SeaHake mod 4 provides greatly advanced performance over its predecessor. The homing head shell is a hydrodynamic optimised parabolic shape which aims to reduce torpedo self-noise and cavitation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Indian Navy
The Indian Navy is the maritime branch of the Indian Armed Forces. The President of India is the Supreme Commander of the Indian Navy. The Chief of Naval Staff, a four-star admiral, commands the navy. As a blue-water navy, it operates significantly in the Persian Gulf Region, the Horn of Africa, the Strait of Malacca, and routinely conducts anti-piracy operations and partners with other navies in the region. It also conducts routine two to three month-long deployments in the South and East China seas as well as the western Mediterranean sea simultaneously. The primary objective of the navy is to safeguard the nation's maritime borders, and in conjunction with other Armed Forces of the union, act to deter or defeat any threats or aggression against the territory, people or maritime interests of India, both in war and peace. Through joint exercises, goodwill visits and humanitarian missions, including disaster relief, the Indian Navy promotes bilateral relations between n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Type 65 Torpedo
The Type 65 is a torpedo manufactured in the Soviet Union/Russia. It was developed for use against US Navy aircraft carrier battle groups, as well as large merchant targets such as supertankers and advanced enemy submarines. It is now typically fitted to newer Russian vessels, though often the 650 mm torpedo tube is fitted with a 533 mm converter to enable firing of SS-N-15 missiles or Type 53 torpedoes. Russian officials have stated that a 65-76A modification of this torpedo is responsible for the 12 August 2000 explosion of the Russian submarine ''Kursk''. Specifications (65-76) *Diameter: 65 cm (25.6 in) *Length: 9.14 m (30 ft) *Range: 50 km at 93 km/h, 100 km at 56 km/h *Max Speed: 50 knots (93 km/h) *Homing: active/passive sonar and wire guidance *Warhead: 450/557 kg high explosive *Propulsion: Probably gas-turbine powered by hydrogen peroxide, kerosene and compressed air fuel. Driving contra-rotating propellers. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kilo-class Submarine
The Kilo class, Soviet designation Project 877 ''Paltus'' (russian: Па́лтус, meaning "halibut"), NATO reporting name Kilo, is a class of diesel-electric attack submarines originally designed in the 1970s and built in the Soviet Union for the Soviet Navy. The initial version of Kilo submarines entered operational service in 1980 and were built until the mid-1990s. Production was switched to the more advanced Project 636 ''Varshavyanka'' (russian: Варшавянка, meaning " Varsovian (inhabitant of Warsaw; feminine)") variant in the mid-1990s, also known as Improved Kilo class in the West. Role These attack submarines are mainly intended for anti-shipping and anti-submarine operations in relatively shallow waters. Original Project 877 boats are equipped with Rubikon MGK-400 sonar system (with NATO reporting name Shark Gill), which includes a mine detection and avoidance sonar MG-519 Arfa (with NATO reporting name Mouse Roar). Newer Project 636 boats are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cavitation
Cavitation is a phenomenon in which the static pressure of a liquid reduces to below the liquid's vapour pressure, leading to the formation of small vapor-filled cavities in the liquid. When subjected to higher pressure, these cavities, called "bubbles" or "voids", collapse and can generate shock waves that may damage machinery. These shock waves are strong when they are very close to the imploded bubble, but rapidly weaken as they propagate away from the implosion. Cavitation is a significant cause of wear in some engineering contexts. Collapsing voids that implode near to a metal surface cause cyclic stress through repeated implosion. This results in surface fatigue of the metal causing a type of wear also called "cavitation". The most common examples of this kind of wear are to pump impellers, and bends where a sudden change in the direction of liquid occurs. Cavitation is usually divided into two classes of behavior: inertial (or transient) cavitation and non-inertial c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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