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List Of British Asdic Systems ...
Asdic was the British version of sonar developed at the end of World War I based on the work of French physicist Paul Langevin and Russian engineer M. Constantin Chilowsky. The system was developed as a means to detect and locate submarines by their reflection of sound waves. By the start of World War II in 1939, most British destroyers and smaller vessels were fitted with it in a variety of different sets. Notes Further reading * {{cite book , last=Brown , first=David K. , author-link=David K. Brown , title=Atlantic Escorts: Ships, Weapons & Tactics in World War II , publisher=Naval Institute Press , location=Annapolis, Maryland , year=2007 , isbn=978-1-59114-012-2 , ref=none Asdic Asdic 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 o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ASDIC
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] |
G And H-class Destroyer
The G- and H-class destroyers were a group of 18 destroyers built for the Royal Navy during the 1930s. Six additional ships being built for the Brazilian Navy when World War II began in 1939 were purchased by the British and named the ''Havant'' class. The design was a major export success with other ships built for the Argentine Navy, Argentine and Royal Hellenic Navy, Royal Hellenic Navies. They were assigned to the Mediterranean Fleet upon completion and enforced the Non-intervention in the Spanish Civil War, Non-Intervention Agreement during the Spanish Civil War of 1936–1939. Most ships were recalled home or were sent to the North Atlantic from October to November 1939, after it became clear that Kingdom of Italy#Fascist regime (1922–1943), Fascist Italy was not going to intervene in World War II. Then they began to escort convoys and patrol for German submarines and commerce raiders. Two ships were lost to German naval mine, mines in the first six months of the war. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Squid (weapon)
Squid was a British World War II ship-mounted anti-submarine warfare, anti-submarine weapon. It consisted of a three-barrelled mortar (weapon), mortar which launched depth charges. It replaced the Hedgehog (weapon), Hedgehog system, and was in turn replaced by the Limbo (weapon), Limbo system. Development Ordered directly from the drawing board in 1942, under the auspices of the Directorate of Miscellaneous Weapons Development, this weapon was rushed into service in May 1943 on board HMS Ambuscade (D38), HMS ''Ambuscade''. The first production unit was installed on HMS Hadleigh Castle (K355), HMS ''Hadleigh Castle''; it went on to be installed on 70 frigates and corvettes during the Second World War. The first successful use was by HMS Loch Killin, HMS ''Loch Killin'' on 31 July 1944, when she sank . The system was credited with sinking 17 submarines in 50 attacks over the course of the war - a success ratio of 2.9 to 1. In contrast, out of 5,174 British depth charge attacks in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beamforming
Beamforming or spatial filtering is a signal processing technique used in sensor arrays for directional signal transmission or reception. This is achieved by combining elements in an antenna array in such a way that signals at particular angles experience constructive interference while others experience destructive interference. Beamforming can be used at both the transmitting and receiving ends in order to achieve spatial selectivity. The improvement compared with omnidirectional reception/transmission is known as the directivity of the array. Beamforming can be used for radio or sound waves. It has found numerous applications in radar, sonar, seismology, wireless communications, radio astronomy, acoustics and biomedicine. Adaptive beamforming is used to detect and estimate the signal of interest at the output of a sensor array by means of optimal (e.g. least-squares) spatial filtering and interference rejection. Techniques To change the directionality of the array when ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hedgehog (weapon)
The Hedgehog (also known as an ''Anti-Submarine Projector'') was a forward-throwing anti-submarine weapon that was used primarily during the Second World War. The device, which was developed by the Royal Navy, fired up to 24 spigot mortars ahead of a ship when attacking a U-boat. It was deployed on convoy escort warships such as destroyers and corvettes to supplement the depth charges. As the mortar projectiles employed contact fuzes rather than time or bathymetric (depth) fuzes, detonation occurred directly against a hard surface such as the hull of a submarine making it more deadly than depth charges, which relied on damage caused by hydrostatic shockwaves. During World War II out of 5,174 British depth charge attacks there were 85.5 kills, a ratio of 60.5 to 1. In comparison, the Hedgehog made 268 attacks for 47 kills, a ratio of 5.7 to 1. Development The "Hedgehog", so named because the empty rows of its launcher spigots resembled the spines on the back of a hedgeh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lend-Lease
Lend-Lease, formally the Lend-Lease Act and introduced as An Act to Promote the Defense of the United States (),3,000 Hurricanes and >4,000 other aircraft) * 28 naval vessels: ** 1 Battleship. (HMS Royal Sovereign (05), HMS Royal Sovereign) ** 9 Destroyers. ** 4 Submarines. ** 5 Motor mine-sweepers. ** 9 Mine-sweeping trawlers. * 5,218 tanks (including 1,388 Valentines from Canada) * >5,000 anti-tank guns ** 1,000 PIAT, P.I.A.T's ** 636 2-pounder gun, 2-Pdr's ** 96 6-pounder gun, 6-Pdr's ** 3,200 Boys anti-tank rifle, Boys anti-tank rifles * 4,020 ambulances and trucks * 323 machinery trucks (mobile vehicle workshops equipped with generators and all the welding and power tools required to perform heavy servicing) * 1,212 Universal Carriers and Loyd Carriers (with another 1,348 from Canada) * 1,721 motorcycles * £1.15bn ($1.55bn) worth of aircraft engines * 1,474 radar sets * 4,338 radio sets * 600 naval radar and sonar sets * Hundreds of naval guns * 15 million pairs of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
L And M-class Destroyer
The L and M class was a class of sixteen destroyers which served in the British Royal Navy The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ... during World War II. The ships of the class were launched between 1939 and 1942. The L class (also known as the ''Laforeys'') were approved under the 1937 Naval Estimates. Four of these ships (''Lance'', ''Lively'', ''Legion'' and ''Larne'') were built with armament instead of 4.7 inch. Six of the eight were war losses, with the surviving pair being broken up in 1948. The M Class were built under the 1939 Naval Estimates. They served in the Home Fleet until 1944 and then went to the Mediterranean. Three were wartime losses; of the five survivors, the ''Musketeer'' was broken up in 1955 and the other four sold to Turkey in 1958. Design ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frigate
A frigate () is a type of warship. In different eras, the roles and capabilities of ships classified as frigates have varied. The name frigate in the 17th to early 18th centuries was given to any full-rigged ship built for speed and maneuverability, intended to be used in scouting, escort and patrol roles. The term was applied loosely to ships varying greatly in design. In the second quarter of the 18th century, what is now generally regarded as the 'true frigate' was developed in France. This type of vessel was characterised by possessing only one armed deck, with an unarmed deck below it used for berthing the crew. Late in the 19th century (British and French prototypes were constructed in 1858), a type of powerful ironclad warships was developed, and because they had a single gun deck, the term 'frigate' was used to describe them. Later developments in ironclad ships rendered the 'frigate' designation obsolete and the term fell out of favour. During the Second World War ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
E And F-class Destroyer
The E and F-class destroyers were a group of 18 destroyers built for the Royal Navy during the 1930s. The ships were initially assigned to the Home Fleet, although they reinforced the Mediterranean Fleet during the Second Italo-Abyssinian War, Italian invasion of Abyssinia of 1935–36 and enforced the Non-intervention in the Spanish Civil War, Non-Intervention Agreement during the Spanish Civil War of 1936–1939. After the beginning of the Second World War in August 1939, the E-class ships were mostly assigned to escort duties under the Western Approaches Command, while the Fs were assigned to escort the ships of the Home Fleet. Between them they sank four German submarines through March 1940 while losing only one ship to a submarine. Most of the sister ship, sisters were committed to the Norwegian Campaign in April–June where they helped to sink one German destroyer and a submarine. The two E-class minelayer-destroyers helped to evacuation of Dunkirk, evacuate Allied troop ... [...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] |
C And D-class Destroyer
The C and D class was a group of 14 destroyers built for the Royal Navy in the early 1930s. As in previous years, it was originally intended to order a complete flotilla comprising eight destroyers—plus a flotilla leader as the ninth unit—in each year. However, only four ships—plus a leader—were ordered under the 1929–1930 Programme as the C class. The other four ships planned for the C class were never ordered as an economy measure and disarmament gesture by the 1929 United Kingdom general election, Labour government of Ramsay MacDonald. A complete flotilla—the 'D' class—was ordered under the 1930–1931 Programme. The five ships of the C class were assigned to Home Fleet upon their completion, although they reinforced the Mediterranean Fleet during the Second Italo-Abyssinian War, Italian invasion of Abyssinia of 1935–1936 and enforced the Non-intervention in the Spanish Civil War, Non-Intervention Agreement during the Spanish Civil War of 1936–1939. They w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sloop Of War
During the 18th and 19th centuries, a sloop-of-war was a warship of the Royal Navy with a single gun deck that carried up to 18 guns. The rating system of the Royal Navy covered all vessels with 20 or more guns; thus, the term encompassed all unrated warships, including gun-brigs and cutters. In technical terms, even the more specialised bomb vessels and fire ships were classed by the Royal Navy as sloops-of-war, and in practice these were employed in the role of a sloop-of-war when not carrying out their specialised functions. In World War I and World War II, the Royal Navy reused the term "sloop" for specialised convoy-defence vessels, including the of the First World War and the highly successful of the Second World War, with anti-aircraft and anti-submarine capabilities. They performed similar duties to the destroyer escorts of the United States Navy, and also performed similar duties to the smaller corvettes of the Royal Navy. Rigging A sloop-of-war was quite differe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
