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USCGC Northland (WPG-49)
USCGC ''Northland'' (WPG-49) was a United States Coast Guard cruising class of gunboat especially designed for Arctic operations in commission from 1927 to 1938 and from 1939 to 1946. She served during World War II. She was the last cruising cutter built for the Coast Guard equipped with a sailing rig.Canney, p 97 After her U.S. Coast Guard career ended, the ship entered Israel service, including duty as the flagship of the Israeli Navy with the name INS ''Eilat''. Design ''Northland'' was designed to be a replacement for the Arctic cutter ''Bear'' and was built at Newport News Shipbuilding and Drydock Corporation, Newport News, Virginia, launched on 5 February 1927 and commissioned on 7 May 1927. She was long, had a maximum displacement of 2,150 tons, and had diesel-electric propulsion driving a single four-blade screw. She was originally fitted with auxiliary sails using yards, but they were removed and her tall masts were trimmed in 1936. She was structurally reinforc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northland 1
Northland may refer to: Corporations * Northland Organic Foods Corporation, headquartered in Saint Paul, Minnesota * Northland Resources, a mining business * Northland Communications, an American cable television, telephone and internet service provider * Northland Properties, the parent company of multiple hotel chains, restaurants, sports teams and properties Places * Northland (New Zealand electorate), northern New Zealand * Northland, Wellington, New Zealand * Northland Peninsula, northern New Zealand * Northland Region, northern New Zealand * Northland, Waupaca County, Wisconsin, US * Northland Pyrite Mine, Canada * The Northland, a section of the Kansas City metropolitan area, US Shopping centres * Northland Center, in Southfield, Michigan * Northland Mall, a demolished shopping mall in Columbus, Ohio * Northland Mall (Appleton, Wisconsin), in Appleton, Wisconsin * Northland Shopping Centre, in Melbourne, Australia * Northland Village Mall, in Calgary, Alberta * Buzz Wes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USS Bear
USS ''Bear'' was a dual steam-powered and sailing ship built with -thick sides which had a long life in various cold-water and ice-filled environs. She was a forerunner of modern icebreakers and had a diverse service life. According to the United States Coast Guard official website, ''Bear'' is described as "probably the most famous ship in the history of the Coast Guard." Built in Scotland in 1874 as a steamer for sealing, she was owned and operated from Newfoundland for ten years. In the mid-1880s, she took part in the search for the Greely Expedition. Captained by Michael Healy of the United States Revenue Cutter Service (later part of the U.S. Coast Guard), she worked the coastline of Alaska. She later assisted with relief efforts after the 1906 San Francisco earthquake. Her services also included the second expedition of Admiral Richard E. Byrd to Antarctica, and again to the southernmost continent in 1941 to evacuate Americans at the beginning of World War II. She lat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Welding
Welding is a fabrication (metal), fabrication process that joins materials, usually metals or thermoplastics, by using high heat to melt the parts together and allowing them to cool, causing Fusion welding, fusion. Welding is distinct from lower temperature techniques such as brazing and soldering, which do not melting, melt the base metal (parent metal). In addition to melting the base metal, a filler material is typically added to the joint to form a pool of molten material (the weld pool) that cools to form a joint that, based on weld configuration (butt, full penetration, fillet, etc.), can be stronger than the base material. Pressure may also be used in conjunction with heat or by itself to produce a weld. Welding also requires a form of shield to protect the filler metals or melted metals from being contaminated or Oxidation, oxidized. Many different energy sources can be used for welding, including a gas flame (chemical), an electric arc (electrical), a laser, an electron ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cork (material)
Cork is an Permeability (earth sciences), impermeable buoyancy, buoyant material, the Cork cambium, phellem layer of bark (botany), bark tissue that is harvested for commercial use primarily from ''Quercus suber'' (the cork oak), which is native to southwest Europe and northwest Africa. Cork is composed of suberin, a hydrophobic substance. Because of its impermeable, buoyant, elastic, and fire retardant properties, it is used in a variety of products, the most common of which is wine stoppers. The Dehesa (pastoral management), montado landscape of Portugal produces approximately half of the cork harvested annually worldwide, with Corticeira Amorim being the leading company in the industry. Cork was examined microscopically by Robert Hooke, which led to his discovery and naming of the cell (biology), cell. Cork composition varies depending on Geography, geographic origin, climate and soil conditions, Genetics, genetic origin, tree dimensions, age (virgin or reproduction), and gro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hull (ship)
A hull is the watertight body of a ship, boat, or flying boat. The hull may open at the top (such as a dinghy), or it may be fully or partially covered with a deck. Atop the deck may be a deckhouse and other superstructures, such as a funnel, derrick, or mast. The line where the hull meets the water surface is called the waterline. General features There is a wide variety of hull types that are chosen for suitability for different usages, the hull shape being dependent upon the needs of the design. Shapes range from a nearly perfect box in the case of scow barges to a needle-sharp surface of revolution in the case of a racing multihull sailboat. The shape is chosen to strike a balance between cost, hydrostatic considerations (accommodation, load carrying, and stability), hydrodynamics (speed, power requirements, and motion and behavior in a seaway) and special considerations for the ship's role, such as the rounded bow of an icebreaker or the flat bottom of a landing craft. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mast (ship)
The mast of a sailing vessel is a tall spar, or arrangement of spars, erected more or less vertically on the centre-line of a ship or boat. Its purposes include carrying sails, spars, and derricks, and giving necessary height to a navigation light, look-out position, signal yard, control position, radio aerial or signal lamp. Large ships have several masts, with the size and configuration depending on the style of ship. Nearly all sailing masts are guyed. Until the mid-19th century, all vessels' masts were made of wood formed from a single or several pieces of timber which typically consisted of the trunk of a conifer tree. From the 16th century, vessels were often built of a size requiring masts taller and thicker than could be made from single tree trunks. On these larger vessels, to achieve the required height, the masts were built from up to four sections (also called masts). From lowest to highest, these were called: lower, top, topgallant, and royal masts. Giving the lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yard (sailing)
A yard is a spar on a mast from which sails are set. It may be constructed of timber or steel or from more modern materials such as aluminium or carbon fibre. Although some types of fore and aft rigs have yards, the term is usually used to describe the horizontal spars used on square rigged sails. In addition, for some decades after square sails were generally dispensed with, some yards were retained for deploying wireless (radio) aerials and signal flags. Parts of the yard ; Bunt : The short section of the yard between the ''slings'' that attach it to the mast. ; Quarters : The port and starboard quarters form the bulk of the yard, extending from the slings to the fittings for the lifts and braces. ; Yardarms : The outermost tips of the yard: outboard from the attachments for the lifts. Note that these terms refer to stretches of the same spar, not to separate component parts. Controlling the yard The yard can rotate around the mast to allow the direction of the vess ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sail
A sail is a tensile structure—which is made from fabric or other membrane materials—that uses wind power to propel sailing craft, including sailing ships, sailboats, windsurfers, ice boats, and even sail-powered land vehicles. Sails may be made from a combination of woven materials—including canvas or polyester cloth, laminated membranes or bonded filaments—usually in a three- or four-sided shape. A sail provides propulsive force via a combination of lift and drag, depending on its angle of attack—its angle with respect to the apparent wind. Apparent wind is the air velocity experienced on the moving craft and is the combined effect of the true wind velocity with the velocity of the sailing craft. Angle of attack is often constrained by the sailing craft's orientation to the wind or point of sail. On points of sail where it is possible to align the leading edge of the sail with the apparent wind, the sail may act as an airfoil, generating propulsive force as air p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Propeller
A propeller (colloquially 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 specially 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 sculling. In sculling, a single blade is moved through an arc, from side to side taking care to keep presenting the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Displacement Ton
Ton is the name of any one of several units of measure. It has a long history and has acquired several meanings and uses. Mainly it describes units of weight. Confusion can arise because ''ton'' can mean * the long ton, which is 2,240 pounds * the short ton, which is 2,000 pounds * the tonne, also called the ''metric ton'', which is 1,000 kilograms or 1 megagram. Its original use as a measurement of volume has continued in the capacity of cargo ships and in terms such as the ''freight ton'' and a number of other units, ranging from in capacity. Recent specialized uses include the ton as a measure of energy and as a means of truck classification. It can also be used as a unit of energy, or in refrigeration as a unit of power, sometimes called a ''ton of refrigeration''. Because the ton (of any system of measuring weight) is usually the heaviest unit named in colloquial speech, its name also has figurative uses, singular and plural, informally meaning a large amount or quantit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Displacement (ship)
The displacement or displacement tonnage of a ship is its weight. As the term indicates, it is measured indirectly, using Archimedes' principle, by first calculating the volume of water displaced by the ship, then converting that value into weight. Traditionally, various measurement rules have been in use, giving various measures in long tons. Today, tonnes are more commonly used. Ship displacement varies by a vessel's degree of load, from its empty weight as designed (known as "lightweight tonnage") to its maximum load. Numerous specific terms are used to describe varying levels of load and trim, detailed below. Ship displacement should not be confused with measurements of volume or capacity typically used for commercial vessels and measured by tonnage: net tonnage and gross tonnage. Calculation The process of determining a vessel's displacement begins with measuring its draft.George, 2005. p.5. This is accomplished by means of its "draft marks" (or "load lines"). A mer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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