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USCGC Barbara Mabrity
USCGC ''Barbara Mabrity'' (WLM-559) is a Keeper-class coastal buoy tender of the United States Coast Guard. Launched in 1999, she is home-ported in Mobile, Alabama. Her primary mission is maintaining aids to navigation from western Florida to the Mississippi River. Secondary missions include marine environmental protection, search and rescue, and security. She is assigned to the Eighth Coast Guard District. Construction and characteristics On 22 June 1993 the Coast Guard awarded the contract for the Keeper-class vessels to Marinette Marine Corporation in the form of a firm contract for the lead ship and options for thirteen more. The Coast Guard exercised options for the fifth through tenth ships, including ''Barbara Mabrity'', in February of 1997. The ship was launched on 26 March 1999 into the Menominee River. ''Barbara Mabrity'' is the ninth of the fourteen Keeper-class ships built. Her hull was built of welded steel plates. She is long, with a beam of , and a ful ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maritime Call Sign
Maritime call signs are call signs assigned as unique identifiers to ships and boats. All radio transmissions must be individually identified by the call sign. Merchant and naval vessels are assigned call signs by their national licensing authorities. History One of the earliest applications of radiotelegraph operation, long predating broadcast radio, were marine radio stations installed aboard ships at sea. In the absence of international standards, early transmitters constructed after Guglielmo Marconi's first trans-Atlantic message in 1901 were issued arbitrary two-letter calls by radio companies, alone or later preceded by a one-letter company identifier. These mimicked an earlier railroad telegraph convention where short, two-letter identifiers served as Morse code abbreviations to denote the various individual stations on the line (for instance, AX could represent Halifax). "N" and two letters would identify U.S. Navy; "M" and two letters would be a Marconi station. On Apr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turbocharger
In an internal combustion engine, a turbocharger (often called a turbo) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake gas, forcing more air into the engine in order to produce more power for a given displacement. The current categorisation is that a turbocharger is powered by the kinetic energy of the exhaust gasses, whereas a supercharger is mechanically powered (usually by a belt from the engine's crankshaft). However, up until the mid-20th century, a turbocharger was called a "turbosupercharger" and was considered a type of supercharger. History Prior to the invention of the turbocharger, |
1846 Havana Hurricane
The 1846 Havana hurricane (also known as the Great Havana hurricane of 1846, San Francisco de Borja hurricane and The Great Gale of 1846) was the most intense tropical cyclone in recorded history for 78 years and the first known Category 5-strength hurricane to strike Cuba. The first indications of the formation of a disturbance were first noted on 5 October in the Caribbean Sea, but little else was known until the storm approached Cuba on 10 October. There, it brought extreme winds and the lowest known atmospheric pressure of the time – 938 mbar (27.70 inHg) – a record which remained unbroken until the development of a later cyclone in 1924. It soon curved toward Florida, where it maintained its intensity, continuing to rapidly hasten northward along the East Coast of the United States to New England. It entered an extratropical transition while situated over New York on 13 October, producing intense Category 2-force winds and unusu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Key West Lighthouse
The Key West Lighthouse is located in Key West, Florida. The first Key West lighthouse was a tower completed in 1825. It had 15 lamps in reflectors. History The first keeper, Michael Mabrity, died in 1832, and his widow, Barbara, became the lighthouse keeper, serving for 32 years. The Great Havana Hurricane of 1846 destroyed the lighthouse; the USS ''Morris'', which was wrecked during the storm, reported "a white sand beach covers the spot where Key West Lighthouse stood". Barbara Mabrity survived, but fourteen people who had sought refuge in the lighthouse tower died, including seven members of her family. (The same hurricane destroyed the Sand Key Lighthouse, eight miles (13 km) away, killing six people, including the keeper, Rebecca Flaherty, another widow of a previous keeper.) Barbara Mabrity continued to serve as keeper of the Key West Light until the early 1860s, when she was fired at age 82 for making statements against the Union (Key West remained under Unio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barbara Mabrity
Barbara (Estacholy) Mabrity (1782–1867) was an American lighthouse keeper. Barbara Mabrity was born in Florida, her father Francesco (Staccioli/Stacoli) Estacholy arrived from Italy as part of the 1768 Turnbull Venture to Florida. Barbara (Estacholy)Mabrity and her husband, Michael, were assigned to be the keepers of Key West Light in 1826. Michael died of yellow fever in 1832, at which point Barbara was formally appointed to take his place. She maintained the light through hurricanes which blew through the key in 1835, 1841, and 1842. On October 10, 1846 another heavy storm hit the island, causing several people, including Mabrity's six children, to take refuge in the lighthouse. However, the tower began to crumble, and the keeper only had time to grab one of her children and escape before it fell, killing those who remained inside. Mabrity continued to serve as keeper before being fired in 1864 for making statements against the Union during the American Civil War; she die ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mercury Marine
Mercury Marine is a marine engine division of Brunswick Corporation headquartered in Fond du Lac, Wisconsin. The main product line is outboard motors. It also produces the MerCruiser line of sterndrives and inboard motors. Some manufacturing is in Fond du Lac, while 40-60 HP motors are made in China. Smaller motors are Tohatsus that have been rebadged. History Founding The Kiekhaefer Mercury company began in 1939 when engineer Carl Kiekhaefer purchased a small outboard motor company in Cedarburg, Wisconsin. Kiekhaefer's original intention for the Kiekhaefer Corporation was to make magnetic separators for the dairy industry. The purchase included 300 defective outboard motors. Kiekhaefer and a small staff of employees rebuilt the motors and sold them to Montgomery Ward, a mail-order company. The motors were much improved, so the buyer purchased more. Kiekhaefer designed motors that withstood the elements better than his competition and called the motor Mercury (taking advanta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Davit
Boat suspended from radial davits; the boat is mechanically lowered Gravity multi-pivot on Scandinavia'' file:Bossoir a gravité.jpg, Gravity Roller Davit file:Davits-starbrd.png, Gravity multi-pivot davit holding rescue vessel on North Sea ferry file:Freefall lifeboat.JPG, Freefall lifeboat on the ''Spring Aeolian'' file:Frapping line.jpg, Frapping line Labeled Tricing Gripe Steps to launch davit Roller Gravity Davit A davit (pronounced "dayvit" or see Wiktionary) is any of various crane-like devices used on a ship for supporting, raising, and lowering equipment such as boats and anchors. Davit systems are most often used to lower an emergency lifeboat to the embarkation level to be boarded. The lifeboat davit has falls (now made of wire, historically of manila rope) that are used to lower the lifeboat into the water. Davits can also be used as man-overboard safety devices to retrieve personnel from the water. The maintaining and operation of davits is all under jurisdi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chief Warrant Officer
Chief warrant officer is a military rank used by the United States Armed Forces, the Canadian Armed Forces, the Pakistan Air Force, the Israel Defense Forces, the South African National Defence Force, the Lebanese Armed Forces and, since 2012, the Singapore Armed Forces. In the United States Armed Forces, chief warrant officer (United States), warrant officers are commissioned officers, not non-commissioned officers (NCOs) like in other NATO forces. Canadian Armed Forces In the Canadian Armed Forces, a chief warrant officer or CWO is the most senior non-commissioned member (NCM) rank for army and air force personnel. Its equivalent rank for navy personnel is chief petty officer 1st class (CPO1). The French language form of chief warrant officer is . A CWO is senior to the rank of master warrant officer (MWO) and its navy equivalent of chief petty officer 2nd class (CPO2). Cadets Canada uses the ranks of chief petty officer 1st class (Royal Canadian Sea Cadets), chief warrant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ballast Tank
A ballast tank is a compartment within a boat, ship or other floating structure that holds water, which is used as ballast to provide hydrostatic stability for a vessel, to reduce or control buoyancy, as in a submarine, to correct trim or list, to provide a more even load distribution along the hull to reduce structural hogging or sagging stresses, or to increase draft, as in a semi-submersible vessel or platform, or a SWATH, to improve seakeeping. Using water in a tank provides easier weight adjustment than the stone or iron ballast used in older vessels, and makes it easy for the crew to reduce a vessel's draft when it enters shallower water, by temporarily pumping out ballast. Airships use ballast tanks mainly to control buoyancy and correct trim. History The basic concept behind the ballast tank can be seen in many forms of aquatic life, such as the blowfish or argonaut octopus. The concept has been invented and reinvented many times by humans to serve a variety of purpo ... [...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] |
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] |
Ulstein Group
Ulstein Group is a group of companies that focus on various marine-related industries, but is mainly known for its shipbuilding and ship design activities. The largest unit is ''Ulstein Verft AS''. The company's head office and primary operations are located in the town of Ulsteinvik in the municipality of Ulstein in Møre og Romsdal county, Norway, an important area for the Norwegian maritime cluster, and with subsidiaries in several other countries. The group also includes companies working with power & control systems and solutions, engineering, site follow-up and aftermarket services. The company has also been engaged in shipping. History The original company, ''Ulstein Mekaniske Verksted'', was established in 1917 by Martin Ulstein and his brother-in-law Andreas Flø. At age 23, Martin and Andreas founded the company to modify local fishing boats, which were undergoing a global transition from sail-power to motorization. Martin Ulstein borrowed money from Ulstein Sparebank, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
