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Net Laying Ship
300px, , an American net laying ship that worked at Pearl Harbor in the 1940s 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-submarine nets or anti torpedo nets. Nets could be laid around an individual ship at anchor, or harbor entrances or dry docks, 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-World War II 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 be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USS ASH AN-7
USS may refer to: Arts, entertainment, and media * Ubiquitous Synergy Seeker, a Canadian band * Universal Studios Singapore, a theme park in Singapore Businesses and organizations * Union of Sovereign States, the planned successor to the Soviet Union * Union Switch & Signal, a supplier of railroad switching equipment * Union Syndicale Suisse, the Swiss Trade Union Confederation * United Seamen's Service, a non-profit, federally chartered organization founded in 1942 * United State of Saurashtra, a separate, western State within the Union of India from 1948 until 1956 * United States Senate, the upper chamber of the United States Congress * U.S. Steel Corporation * USA Swimming, formerly United States Swimming, the national governing body for competitive swimming in the US * Universities Superannuation Scheme, a pension scheme in the United Kingdom * United Peasant Party (''Ujedinjena seljačka stranka''), a political party in Serbia Computing * Unformatted System Services, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lānaʻi
Lānai is the sixth-largest of the Hawaiian Islands and the smallest publicly accessible inhabited island in the chain. It is colloquially known as the Pineapple Island because of its past as an island-wide pineapple plantation. The island's only settlement of note is the small town of Lānai City. The island is 98% owned by Larry Ellison, cofounder and chairman of Oracle Corporation; the remaining 2% is owned by the state of Hawaii or individual homeowners. Lānai has a land area of , making it the 43rd largest island in the United States. It is separated from the island of Molokai by the Kalohi Channel to the north, and from Maui by the Auau Channel to the east. The United States Census Bureau defines Lānai as Census Tract 316 of Maui County. Its total population rose to 3,367 as of the 2020 United States census, up from 3,193 as of the 2000 census and 3,131 as of the 2010 census. As visible via satellite imagery, many of the island's landmarks are accessible only ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacific Ocean Theater Of World War II
The Pacific Ocean theater of World War II was a major theater of the Pacific War, the war between the Allies and the Empire of Japan. It included the U.S. Pacific Ocean Areas (command). which included most of the Pacific Ocean and its islands. The Philippines, the Dutch East Indies, Borneo, Australia, most of the Territory of New Guinea, and the western part of the Solomon Islands were under a different Allied command. History On March 30, 1942, US Admiral Chester Nimitz was appointed Commander-in-Chief, Pacific Ocean Areas. In the other major theater in the Pacific region, known as the South West Pacific theater, Allied forces were commanded by US General Douglas MacArthur. Both Nimitz and MacArthur were overseen by the US Joint Chiefs, and indirectly by the British-American Combined Chiefs of Staff. Most Japanese forces in the theater were part of the of the Imperial Japanese Navy (IJN), which was responsible for all Japanese warships, naval aircraft, and mar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oerlikon 20 Mm Cannon
The Oerlikon 20 mm cannon is a series of autocannons based on an original German Becker Type M2 20 mm cannon design that appeared very early in World War I. It was widely produced by Oerlikon Contraves and others, with various models employed by both Allied and Axis forces during World War II. Many versions of the cannon are still used. Blowback-operated models History Origins During World War I, the German industrialist Reinhold Becker developed a 20 mm caliber cannon, known now as the 20 mm Becker using the advanced primer ignition blowback (API blowback) method of operation. This used a 20×70mmRB cartridge and had a cyclic rate of fire of 300 rpm. It was used on a limited scale as an aircraft gun on ''Luftstreitkräfte'' warplanes, and an anti-aircraft gun towards the end of that war. Because the Treaty of Versailles banned further production of such weapons in Germany, the patents and design works were transferred in 1919 to the Swiss firm SEMAG (''Seebach M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
3-inch/50-caliber Gun
The 3-inch/50-caliber gun (spoken "three-inch fifty-caliber") in United States naval gun terminology indicates the gun fired a projectile in diameter, and the barrel was 50 calibers long (barrel length is 3 in × 50 = ). Different guns (identified by Mark numbers) of this caliber were used by the U.S. Navy and U.S. Coast Guard from 1900 through to 1990 on a variety of combatant and transport ship classes. The gun is still in use with the Spanish Navy on ''Serviola''-class patrol boats. Early low-angle guns The US Navy's first 3 inch /50-caliber gun (Mark 2) was an early model with a projectile velocity of per second. Low-angle (single-purpose/non-anti-aircraft) mountings for this gun had a range of 7000 yards at the maximum elevation of 15 degrees. The gun entered service around 1900 with the s, and was also fitted to s. By World War II these guns were found only on a few Coast Guard cutters and Defensively Equipped Merchant Ships. Low-angle 3 inch/50-caliber guns ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Propeller
A propeller (often called a screw if on a ship or an airscrew if on an aircraft) is a device with a rotating hub and radiating blades that are set at a pitch to form a helical spiral which, when rotated, exerts linear thrust upon a working fluid such as water or air. Propellers are used to pump fluid through a pipe or duct, or to create thrust to propel a boat through water or an aircraft through air. The blades are shaped so that their rotational motion through the fluid causes a pressure difference between the two surfaces of the blade by Bernoulli's principle which exerts force on the fluid. Most marine propellers are screw propellers with helical blades rotating on a propeller shaft (ship), propeller shaft with an approximately horizontal axis. History Early developments The principle employed in using a screw propeller is derived from stern sculling. In sculling, a single blade is moved through an arc, from side to side taking care to keep presenting the blade to the wat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diesel Engine
The diesel engine, named after the German engineer Rudolf Diesel, is an internal combustion engine in which Combustion, ignition of diesel fuel is caused by the elevated temperature of the air in the cylinder due to Mechanics, mechanical Compression (physics), compression; thus, the diesel engine is called a compression-ignition engine (CI engine). This contrasts with engines using spark plug-ignition of the air-fuel mixture, such as a petrol engine (gasoline engine) or a gas engine (using a gaseous fuel like natural gas or liquefied petroleum gas). Introduction Diesel engines work by compressing only air, or air combined with residual combustion gases from the exhaust (known as exhaust gas recirculation, "EGR"). Air is inducted into the chamber during the intake stroke, and compressed during the compression stroke. This increases air temperature inside the Cylinder (engine), cylinder so that atomised diesel fuel injected into the combustion chamber ignites. The torque a dies ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of United States Navy Amphibious Warfare Ships
This is a list of United States Navy amphibious warfare ships. This amphibious warfare ship, type of ship has been in use with the United States Navy, US Navy since World War I. Ship status is indicated as either currently active [A] (including ready reserve), inactive [I], or precommissioning [P]. Ships in the inactive category include only ships in the inactive reserve, ships which have been disposed from US service have no listed status. Ships in the precommissioning category include ships under construction or on order. Historical overview There have been four generations of amphibious warfare ships, with each generation having more capability than the previous: * The first generation simply landed troops and equipment ashore with standard (i.e., non-specialized) boats and barges. These ships are not listed in this article since they were indistinguishable from the troopships and other surface combatants of their day, and as such were not assigned specialized hull classifica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Naval Base Ulithi
Naval Base Ulithi was a major United States Navy base at the Ulithi Atoll in the Caroline Islands in the western Pacific Ocean, to the north of New Guinea during World War II. The base was built to support the island-hopping Pacific War efforts of the Allied nations fighting the Empire of Japan. In terms of the number of ships at one base, Naval Base Ulithi was the largest naval base in the world in 1944 and 1945, with over 600 ships at times. Background The Caroline Islands are now the Federated States of Micronesia nation. Micronesia comprises the Kosrae State, Pohnpei State, Chuuk State (formerly Truk) and Yap State. After the Spanish–American War in 1898, the islands became a German colony and German naval base. At the start of World War I in 1914, British warships destroyed the German colonial plantation owner's radio station. On 7 October 1914, Japan invaded and took over Yap Island without a battle. Japan and Britain made a treaty giving Japan the Pacific ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Naval Base Majuro
Map Majuro and Arno Atolls Naval Base Majuro was a major United States Navy base built on Majuro Atoll, in the Marshall Islands to support the World War II efforts in the Pacific War. The base was built after the Battle of Majuro-Kwajalein ended 3 February 1944. Majuro was found to be unoccupied and abandoned when the United States Army arrived. The US Navy built airfields, a seaport, and other facilities on the captured islands. The base was part of the vast Naval Base Marshall Islands. History When the US Army arrived they found abandoned at Darrit Island a 400-foot timber pier, a seaplane ramp, and warehouses, as well as a 5,800-foot runway at Dalop Island. US Navy Seabees of the 100th Construction Battalion began improvement projects at the base. On Delap the 5,800 feet (1,800 m) by 445 feet (136 m) runway was repaired and paved in coral. The complete Majuro Airfield became home to a number of units: two Marine dive-bomber squadrons, half a Marine patrol squadron, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aircraft Carrier Operations During World War II
This article discusses aircraft carrier operations during World War II. Historical overview Naval historians such as Evan Mawdsley, Richard Overy, and Craig Symonds concluded that World War II's decisive victories on land could not have been won without decisive victories at sea. Naval battles to keep shipping lanes open for combatants' movement of troops, guns, ammunition, tanks, warships, aircraft, raw materials, and food largely determined the outcome of land battles. Without the Allied victory in keeping shipping lanes open during the Battle of the Atlantic, Britain could not have fed her people or withstood Axis offensives in Europe and North Africa. Without Britain's survival and without Allied shipments of food and industrial equipment to the Soviet Union, her military and economic power would likely not have rebounded in time for Russian soldiers to prevail at Stalingrad and Kursk. Without victories at sea in the Pacific theater, the Allies could not have mounted amphib ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Mine Warfare Vessels Of The United States Navy
This is a list of mine warfare vessels of the United States Navy. Ship status is indicated as either currently active (including ready reserve), inactive or precommissioning Ships in the inactive category include only ships in the inactive reserve, ships which have been disposed from US service have no listed status. Ships in the precommissioning category include ships under construction or on order. Historical overview Mine warfare consists of: minelaying, the deployment of explosive naval mines at sea to sink enemy ships or to prevent their access to particular areas; minesweeping, the removal or detonation of naval mines; and degaussing, the process of decreasing or eliminating a remnant magnetic field in a ship's hull to prevent its detection by magnetic mines. The US Navy has operated ships and craft for all three purposes. Mine planting is the laying and maintenance of controlled mines for harbor defense, which was traditionally a role of the US Army. Classifica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
