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Powhatan-class Tugboat
The ''Powhatan'' class of fleet ocean tugs consists of seven ships built for the United States Navy, and operated by the Military Sealift Command (MSC). The lead ship of the class was launched in 1978 and the last ship in MSC service will be deactivated in 2023. During their service life, the ''Powhatan's'' were the most powerful tugs owned by the Navy. Origins The experiences of World War II influenced the design of ''Powhatan'' class. First, fleet tugs had to be powerful ships, able to tow the Navy's largest combatants when they were damaged in battle or were unable to proceed under their own power. Fleet tug USS ''Vireo'' took the bomb-damaged aircraft carrier USS ''Yorktown'' under tow during the Battle of Midway in June 1942. She was so under-powered for the task that she could barely keep the carrier on course. Navy aircraft carriers had tripled in displacement by the time the ''Powhatan'' class was conceived, requiring much greater towing power than previous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Navajo-class Rescue And Salvage Ship
The ''Navajo'' class is a class of Towing, Salvage and Rescue Ships of the United States Navy. They were ordered in 2017 as the planned replacement for the aging s and s. The lead ship of the first batch of six ships was laid down in 2019. Two additional ships were ordered in 2020. In October 2021, Austal had been awarded a $145 million contract to build two Towing, Salvage, and Rescue ships (T-ATS 11 and 12), and options for up to three additional T-ATS ships. On 23 July 2022, two additional ''Navajo''-class ships were ordered from Austal Austal is an Australian-based global ship building company and defence prime contractor that specialises in the design, construction and support of defence and commercial vessels. Austal's product range includes naval vessels, high-speed passeng .... Development Eight ships of the class were planned to replace the aging s and s. They were ordered in 2017 and on 16 March 2018 Gulf Island Fabrication was chosen to construct them. On 26 Ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ducted Propeller
A ducted propeller, also known as a Kort nozzle, is a marine propeller fitted with a non-rotating nozzle. It is used to improve the efficiency of the propeller and is especially used on heavily loaded propellers or propellers with limited diameter. It was developed first by Luigi Stipa (1931) and later by Ludwig Kort (1934). The Kort nozzle is a shrouded propeller assembly for marine propulsion. The cross-section of the shroud has the form of a foil, and the shroud can offer hydrodynamic advantages over bare propellers, under certain conditions. Advantages are increased efficiency at lower speeds (10 knots), course stability when sailing astern, and increase of cavitation. Ducted propellers are also used to replace rudders. History Luigi Stipa in 1931 and later Ludwig Kort (1934) demonstrated that an increase in propulsive efficiency could be achieved by surrounding the propeller with a foil-shaped shroud in the case of heavily loaded propellers. A "Kort Nozzle" is referred ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Commander Strike Force Training Atlantic
Commander, Carrier Strike Group FOUR (CCSG-4 or COMSTRKGRUFOUR) is the U.S. Fleet Forces Command formation charged with training and certifying Atlantic Fleet Carrier Strike Groups, Amphibious Ready Groups, and independently deploying surface ships. Its mission is to "Conduct safe and effective Strike Force Training of the Atlantic Fleet." From 2004 to 2014, The command was known as Commander, Strike Force Training Atlantic (CSFTL or COMSTRKFORTRALANT) Until 2004, The command was known as Carrier Group FOUR/Commander, Carrier Striking Force (CCG-4). CCSG-4 is a one star command under the three-star Deputy Commander, U.S. Fleet Forces Command, and is based at Naval Station Norfolk, Virginia. Tactical Training Group, Atlantic (TTGL) and Expeditionary Warfare Training Group, Atlantic (EWTGL) are subordinate commands. History Carrier Division Four was initially activated as an element of the United States Fifth Fleet on 13 March 1943. Seeing extensive action throughout the Seco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USNS Narragansett (T-ATF-167)
USNS ''Narragansett'' (T-ATF-167) is a Powhatan-class tugboat, ''Powhatan''-class fleet ocean tugboat of the US Navy. She was launched in 1979 and inactivated in 1999, but has since been employed in a number of roles. She is still in service as of 2023 as a training support vessel for Commander Strike Force Training Atlantic, Carrier Strike Group 4. Construction and characteristics The ship was laid down on 5 May 1977 by the Fincantieri Marinette Marine, Marinette Marine Corp. of Marinette, Wisconsin. ''Narragansett'' was launched on 12 May 1979, and delivered to the Navy on 9 November 1979. Her hull was built of welded steel plates. She is long at the waterline and overall, with a beam of , and a draft of . She displaces 2,260 tons fully loaded. As originally built, ''Narragansett'' had two Variable-pitch propeller (marine), controllable-pitch Ducted propeller, Kort-nozzle propellers for propulsion. She had two 20-cylinder Diesel engines, Electro-Motive Diesel, GM EMD ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USNS Powhatan Port Side
United States Naval Ship (USNS) is the prefix designation given to non- commissioned ships that are property of the United States Navy (USN). Definition United States Naval Ships are unarmed auxiliary support vessels owned by the U.S. Navy and operated in non-commissioned service by Military Sealift Command with a civilian crew. Some ships include a small military complement to carry out communication and special mission functions, or for force protection. In comparison, U.S. Navy ships commissioned into service have the designation " USS" and are armed, crewed by U.S. Navy personnel, and held in property by the United States Government. Additionally, the United States Naval Ships hull classification symbol begins with "T-" to denote its civilian crew. The USNS prefix can be assigned only while the ship is owned by the U.S. Navy. If, after being taken out of service, the ship is transferred to the Maritime Administration the prefix reverts to a civilian ship prefix such ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USNS Powhatan (T-ATF-166)
USNS ''Powhatan'' (T-ATF-166) was the lead ship of the United States Navy ''Powhatan''-class fleet ocean tugboats. She was in service with the U.S. Navy from 1979 to 1999, and then was leased to a private towing and salvage company. At the end of the lease in 2008, the ship was sold to the Turkish Navy which recommissioned her as TCG ''Inebolu.'' Construction and characteristics The contract for the first four ''Powhatan''-class tugs was awarded to Marinette Marine on 12 September 1975. ''Powhatan'' was the first of these vessels to be launched. The contract price for the four ships was $30.5 million. ''Powhatan'' was laid down on 30 September 1976 at Marinette Marine's Marinette, Wisconsin shipyard. She was launched on 24 June 1978. The ship was christened at a ceremony in Marinette on 28 October 1978. Her sponsor was Alice Stratton, who was a Navy wife for 19 years at the time, including six during which her husband, Lieutenant Commander Richard Stratton was a p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dynamic Positioning
Dynamic positioning (DP) is a computer-controlled system to automatically maintain a vessel's position and heading by using its own propellers and thrusters. Position reference sensors, combined with wind sensors, motion sensors and gyrocompasses, provide information to the computer pertaining to the vessel's position and the magnitude and direction of environmental forces affecting its position. Examples of vessel types that employ DP include ships and semi-submersible mobile offshore drilling units (MODU), oceanographic research vessels, cable layer ships and cruise ships. The computer program contains a mathematical model of the vessel that includes information pertaining to the wind and current drag of the vessel and the location of the thrusters. This knowledge, combined with the sensor information, allows the computer to calculate the required steering angle and thruster output for each thruster. This allows operations at sea where mooring or anchoring is not feasible du ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Native Americans In The United States
Native Americans, also known as American Indians, First Americans, Indigenous Americans, and other terms, are the Indigenous peoples of the mainland United States ( Indigenous peoples of Hawaii, Alaska and territories of the United States are generally known by other terms). There are 574 federally recognized tribes living within the US, about half of which are associated with Indian reservations. As defined by the United States Census, "Native Americans" are Indigenous tribes that are originally from the contiguous United States, along with Alaska Natives. Indigenous peoples of the United States who are not listed as American Indian or Alaska Native include Native Hawaiians, Samoan Americans, and the Chamorro people. The US Census groups these peoples as " Native Hawaiian and other Pacific Islanders". European colonization of the Americas, which began in 1492, resulted in a precipitous decline in Native American population because of new diseases, wars, ethni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bollard Pull
Bollard pull is a conventional measure of the pulling (or towing) power of a watercraft. It is defined as the force (in tonnes force, or kilonewtons (kN)) exerted by a vessel under full power, on a shore-mounted bollard through a tow-line, commonly measured in a practical test (but sometimes simulated) under test conditions that include calm water, no tide, level trim, and sufficient depth and side clearance for a free propeller stream. Like the horsepower or mileage rating of a car, it is a convenient but idealized number that must be adjusted for operating conditions that differ from the test. The bollard pull of a vessel may be reported as two numbers, the ''static'' or ''maximum'' bollard pull - the highest force measured - and the ''steady'' or ''continuous'' bollard pull, the average of measurements over an interval of, for example, 10 minutes. An equivalent measurement on land is known as drawbar pull, or tractive force, which is used to measure the total horizontal for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deluge Gun
A deluge gun, fire monitor, master stream or deck gun is an aimable controllable high-capacity water jet used for manual firefighting or automatic fire protection systems. Deluge guns are often designed to accommodate foam which has been injected in the upstream piping. Installation Deluge guns are often fitted to fire boats, tug boats, and atop large fire trucks for use in manual firefighting, where they can be aimed and operated by one firefighter and are used to deliver water or foam from outside the immediate area of the fire. Deluge guns are sometimes installed in fixed fire protection systems to protect high hazards, such as aviation hangars and helicopter landing pads. Similarly, facilities with highly flammable material such as oil refineries may have permanently-installed deluge guns. Most apparatus-mounted deluge guns can be directed by a single firefighter, compared to a standard fire hose which normally requires several. Deluge guns can be automatically positioned f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USNS Mohawk Towing Battleship Wisconsin
United States Naval Ship (USNS) is the prefix designation given to non- commissioned ships that are property of the United States Navy (USN). Definition United States Naval Ships are unarmed auxiliary support vessels owned by the U.S. Navy and operated in non-commissioned service by Military Sealift Command with a civilian crew. Some ships include a small military complement to carry out communication and special mission functions, or for force protection. In comparison, U.S. Navy ships commissioned into service have the designation " USS" and are armed, crewed by U.S. Navy personnel, and held in property by the United States Government. Additionally, the United States Naval Ships hull classification symbol begins with "T-" to denote its civilian crew. The USNS prefix can be assigned only while the ship is owned by the U.S. Navy. If, after being taken out of service, the ship is transferred to the Maritime Administration the prefix reverts to a civilian ship prefix such ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Detroit Diesel
Detroit Diesel Corporation (DDC) is an American diesel engine manufacturer headquartered in Detroit, Michigan, United States. It is a subsidiary of Daimler Truck North America, which is itself a wholly owned subsidiary of the mulitinational Daimler Truck AG. The company manufactures heavy-duty engines and chassis components for the on-highway and vocational commercial truck markets. Detroit Diesel has built more than 5 million engines since 1938, more than 1 million of which are still in operation worldwide. Detroit Diesel's product line includes engines, axles, transmissions, and a Virtual Technician service. Detroit engines, transmissions, and axles are used in several models of truck manufactured by Daimler Truck North America. Divisions Detroit Diesel consists of manufacturing operations of axles, transmissions and diesel engines for on-highway only, which is owned by Daimler Truck AG. The former off-highway division was sold to MTU Friedrichshafen in 2006 and subsequentl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
