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The weight of the chain is vital for proper holding of the anchor. [1] An anchor is a device, normally made of metal, used to secure a vessel to the bed of a body of water to prevent the craft from drifting due to wind or current. The word derives from Latin ancora, which itself comes from the Greek ἄγκυρα (ankȳra). [2] [3]
The stockless anchor is an improved version of the Admiralty anchor it is derived from. It has two flukes that pivot on the same plane perpendicular to the shank. [2] The weight of the shank and accompanying chain, or the shank angled under tension, keep the anchor laying flat on the sea floor.
A deep-penetrating anchor (DPA) is conceptually similar to a torpedo anchor: it features a dart-shaped, thick-walled, steel cylinder with flukes attached to the upper section of the anchor. A full-scale DPA is approximately 15 metres (49 ft) in length, 1.2 metres (4 ft) in diameter, and weighs on the order of 50–100 tonnes (49–98 long tons ...
In 1903 they were adopted generally for the British Navy, after extensive anchor trials, begun in 1885. Their advantages are: handiness combined with a saving of time and labor; absence of davits, anchor-beds, and other gear, with a resulting reduction in weight; and a clear forecastle for "right ahead" gun fire or for working ship.
A shot, one of the forged lengths of chain joined by shackles to form an anchor cable, was usually 15 fathoms (90 ft; 27 m). [26] A shackle, a length of cable or chain equal to 12 + 1 ⁄ 2 fathoms (75 ft; 22.9 m). [27] In 1949, the British navy redefined the shackle to be 15 fathoms (90 ft; 27 m). [28]
The term can be applied to many nautical situations: Foul hawse — when a ship lying to two anchors gets the cables crossed. [2]Foul bottom — in reference to a seafloor that has poor qualities for securing an anchor, such as hard rocks, coral, wreckage, or other impediments that would make securing or unsecuring an anchor difficult or impossible.
Archaeologists have unearthed strange alien-looking statues with elongated heads from over 7,000 years ago in Kuwait, shedding more light on the origin and evolution of one of the oldest ...
An F-14 Tomcat descends to make an arresting gear landing on the flight deck of USS Theodore Roosevelt (CVN-71) in 2002. An arresting gear, or arrestor gear, is a mechanical system used to rapidly decelerate an aircraft as it lands.
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