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Anti-submarine Boom
An anti-submarine net or anti-submarine boom is a boom placed across the mouth of a harbour or a strait for protection against submarines. Examples of anti-submarine nets * Lake Macquarie anti-submarine boom *Indicator net * Naval operations in the Dardanelles Campaign *Sydney Harbour anti-submarine boom netIsle of Bute during World War II - Anti-submarine net in the Clyde Estuary in Scotland (Item 4) See also *Anti-submarine warfare * Jumping wire (of a submarine) *Net cutter (submarine) *Net laying ship *Torpedo net Anti-submarine warfare Anti-submarine weapons An anti-submarine weapon (ASW) is any one of a number of devices that are intended to act against a submarine and its crew, to destroy (sink) the vessel or reduce its capability as a weapon of war. In its simplest sense, an anti-submarine weapo ... Auxiliary gateship classes References {{reflist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anti-submarine Net Between Fort York Redoubt And McNabs Island
An anti-submarine weapon (ASW) is any one of a number of devices that are intended to act against a submarine and its crew, to destroy (sink) the vessel or reduce its capability as a weapon of war. In its simplest sense, an anti-submarine weapon is usually a projectile, missile or bomb that is optimized to anti-submarine warfare, destroy submarines. History Before World War I Prior to about 1890, naval weapons were only used against surface shipping. With the rise of the military submarine after this time, countermeasures were considered for use against them. The first submarine installation of torpedo tubes was in 1885 and the first ship was sunk by a submarine-launched torpedo in 1887. There were only two ways of countering the military submarine initially: ramming them or sinking them with gunfire. However, once they were submerged, they were largely immune until they had to surface again. By the start of the First World War there were nearly 300 submarines in service with a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boom (navigational Barrier)
A boom or a chain (also boom defence, harbour chain, river chain, chain boom, boom chain or variants) is an obstacle strung across a navigable stretch of water to control or block navigation. In modern times they usually have civil uses, such as to prevent access to a dangerous river channel. But, especially historically, they have been used militarily, with the goal of denying access to an enemy's ships: a modern example is the anti-submarine net. Booms have also been used to force passing vessels to pay a toll. Description A boom generally floats on the surface, while a chain can be on the surface or below the water. A chain could be made to float with rafts, logs, ships or other wood, making the chain a boom as well. Historical uses Especially in medieval times, the end of a chain could be attached to a chain tower or boom tower. This allowed safe raising or lowering of the chain, as they were often heavily fortified. By raising or lowering a chain or boom, access could be s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anti-submarine Boom (Lake Macquarie WWII)
The Lake Macquarie anti-submarine boom was a submarine and small boat defence boom located at the entrance to Lake Macquarie, New South Wales, Australia during World War II. It spanned the entire width of the lake channel between Grannies Pool, Blacksmiths and Lucy's Wall, Swansea Heads. It was built to protect the large flying boat base, RAAF Rathmines at Rathmines and as part of southern perimeter defence of Fortress Newcastle. The boom was constructed with a series of poles embedded within the lake channel supported by a net of steel cables. A gap in the boom could be raised with the aid of winches. A pill box and machine gun emplacement were constructed at the Blacksmiths (northern) end of the boom. Trenches zigzagged between Swansea Heads and Caves Beach on the southern side. See also * Sydney Harbour anti-submarine boom net The Sydney Harbour anti-submarine boom net was an anti-torpedo and submarine defence net that was in Sydney Harbour during World War II. It s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Indicator Net
Constructed using light steel nets, indicator nets were often anchored at various depths to the sea bed around Allied naval bases during both world wars. They were intended to entangle U-boat traffic of the enemy, even though the submarines often managed to disentangle themselves and escape before being blown up by depth charges. Predominantly deployed by the Royal Navy as a means of discouraging enemy submarines from entering Allied waters, indicator nets were used extensively during World War I. Individual nets were sometimes as much as in length. Instead of being used as the sole anti-submarine measure, indicator nets were often mixed with extensive minefields and patrolling warships. Sometimes mines were attached directly to the nets, thus reducing submarine survival chances. After a submarine became entangled in the net, a marker buoy attached to the net drifted along the water's surface indicating an enemy below. The first example of indicator nets causing the destructio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sydney Harbour Anti-submarine Boom Net
The Sydney Harbour anti-submarine boom net was an anti-torpedo and submarine defence net that was in Sydney Harbour during World War II. It spanned the entire width of the harbour from Laing Point (formerly known as Green Point), Watsons Bay to Georges Head, on the northern side of Sydney Harbour. The boom formed part of the Sydney Harbour defences which also included artillery batteries and patrol boats. History Construction of the boom commenced in January 1942 and the boom and gates were fully operational by August 1942. For over three years, entry to Sydney Harbour was restricted by the boom net. All vessels including ships, ferries and fishing boats gained access to the harbour via one of three gates in the anti-torpedo and anti–submarine boom which spanned the harbour from Green Point to Georges Head. On the night of 31 May 1942, three Japanese midget submarines entered the harbour in what became known as the Battle of Sydney Harbour (often referred to as the Attack ... [...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] |
Jumping Wire
A jumping wire is a wire cable stretched between the bow and stern of a submarine, via the conning tower or periscope standards. Its purpose is to allow the submarine to pass under nets and other marine defences, without the obstruction snagging on the vessel's superstructure, the wire causing the net to ride up and over the top of the submarine. Jumping wires have fallen out of use since the end of World War II, as the wire tends to vibrate at high underwater speeds creating noise that may be detected by an enemy using passive sonar, as well as causing hydrodynamic In physics and engineering, fluid dynamics is a subdiscipline of fluid mechanics that describes the flow of fluids— liquids and gases. It has several subdisciplines, including '' aerodynamics'' (the study of air and other gases in motion) a ... drag. Submarine design {{Submarine-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Net Cutter (submarine)
A submarine's net cutter is a device mounted on the bows of some naval submarines to cut through anti-submarine netting. Some net cutters are powered by explosives. 'US Navy'' See also * Torpedo net cutter *Net cutter (fisheries patrol)
Net cutters, or trawlwire cutters, were secret weaponsSæmundsson, Sveinn (1984) ''Guðmundur skipherra Kjærnested'', Örn og Örlygur. eykjavík p. 187-189. emplo ...
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Net Laying Ship
A net laying ship, also known as a net layer, net tender, gate ship or boom defence vessel was a type of naval auxiliary ship. A net layer's primary function was to lay and maintain steel anti-torpedo or anti-submarine nets. Nets could be laid around an individual ship at anchor, or around harbors or other anchorages. Net laying was potentially dangerous work, and net laying seamen were experts at dealing with blocks, tackles, knots and splicing. As World War II progressed, net layers were pressed into a variety of additional roles including salvage, troop and cargo transport, buoy maintenance, and service as tugboats. US Navy 1930s War Plan Orange, the pre-WW2 US plan for war with Japan, anticipated that Pearl Harbor would be too small for the US Navy fleet that would be amassed in Hawaii. Orange anticipated the construction of a large anchorage in Lahaina Roads between the islands of Maui, Lānaʻi, and Molokaʻi. Construction would consist of massive nets and minefields ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Torpedo Net
Torpedo nets were a passive ship defensive device against torpedoes. They were in common use from the 1890s until the World War II, Second World War. They were superseded by the anti-torpedo bulge and torpedo belts. Origins With the introduction of the Whitehead torpedo in 1873, and the subsequent development of the torpedo boat, new means were sought to protect capital ships against underwater attacks. In 1876 the British Admiralty Torpedo Committee came up with a number of recommendations for combating torpedoes, which included "... nets of galvanised iron hung around each battleship from projecting 40 ft spars". Experiments were conducted in 1877, with becoming the first operational ship to be fitted with the nets. Design and use Torpedo nets could be hung out from the defending ship, when moored or otherwise stationary in the water, on multiple horizontal boom (sailing), booms. Each boom was fixed to the ship at one end at or below the edge of the main deck, by a steel pin t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anti-submarine Weapons
An anti-submarine weapon (ASW) is any one of a number of devices that are intended to act against a submarine and its crew, to destroy (sink) the vessel or reduce its capability as a weapon of war. In its simplest sense, an anti-submarine weapon is usually a projectile, missile or bomb that is optimized to destroy submarines. History Before World War I Prior to about 1890, naval weapons were only used against surface shipping. With the rise of the military submarine after this time, countermeasures were considered for use against them. The first submarine installation of torpedo tubes was in 1885 and the first ship was sunk by a submarine-launched torpedo in 1887. There were only two ways of countering the military submarine initially: ramming them or sinking them with gunfire. However, once they were submerged, they were largely immune until they had to surface again. By the start of the First World War there were nearly 300 submarines in service with another 80 in production ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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