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Crash Dive
A crash dive is a maneuver by a submarine in which the vessel submerges as quickly as possible to avoid attack. Crash diving from the surface to avoid attack has been largely rendered obsolete with the advent of nuclear-powered submarines, as they normally operate submerged. However, the crash dive is also a standard maneuver to avoid a collision. A crash dive in a diesel-powered submarine requires careful orchestration of the crew. On German U-boats of World War II, a crash dive began with the Captain or senior lookouts giving the order "Alarm!" which led to a bridge officer activating the alarm bell. All crew members then immediately stopped what they were doing and proceeded to their diving stations. Once the lookouts were below deck and the upper deck hatch was secured, the Captain or Chief Engineer shouted the order, "Fluten" ("flood the tanks"). With the bow planes at a maximum down angle, the crew then flooded the forward ballast tanks. Often, all available crew members mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Submarine
A submarine (or sub) is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. The term is also sometimes used historically or colloquially to refer to remotely operated vehicles and robots, as well as medium-sized or smaller vessels, such as the midget submarine and the wet sub. Submarines are referred to as ''boats'' rather than ''ships'' irrespective of their size. Although experimental submarines had been built earlier, submarine design took off during the 19th century, and they were adopted by several navies. They were first widely used during World War I (1914–1918), and are now used in many navies, large and small. Military uses include attacking enemy surface ships (merchant and military) or other submarines, and for aircraft carrier protection, blockade running, nuclear deterrence, reconnaissance, conventional land attack (for example, using a cruise missile), and covert insertion o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ostrich "Head In The Sand" Myth
The common ostrich (''Struthio camelus''), or simply ostrich, is a species of flightless bird native to certain large areas of Africa and is the largest living bird species. It is one of two extant species of ostriches, the only living members of the genus '' Struthio'' in the ratite order of birds. The other is the Somali ostrich (''Struthio molybdophanes''), which was recognized as a distinct species by BirdLife International in 2014 having been previously considered a distinctive subspecies of ostrich. The common ostrich belongs to the order Struthioniformes. Struthioniformes previously contained all the ratites, such as the kiwis, emus, Rhea (bird), rheas, and Cassowary, cassowaries. However, recent genetic analysis has found that the group is not monophyletic, as it is paraphyletic with respect to the tinamous, so the ostriches are now classified as the only members of the order. Phylogenetic studies have shown that it is the sister group to all other members of Palaeogn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Medal Of Honor
The Medal of Honor (MOH) is the United States Armed Forces' highest military decoration and is awarded to recognize American soldiers, sailors, marines, airmen, guardians and coast guardsmen who have distinguished themselves by acts of valor. The medal is normally awarded by the president of the United States, but as it is presented "in the name of the United States Congress", it is sometimes erroneously referred to as the "Congressional Medal of Honor". There are three distinct variants of the medal: one for the Department of the Army, awarded to soldiers, one for the Department of the Navy, awarded to sailors, marines, and coast guardsmen, and one for the Department of the Air Force, awarded to airmen and guardians. The Medal of Honor was introduced for the Department of the Navy in 1861, soon followed by the Department of the Army's version in 1862. The Department of the Air Force used the Department of the Army's version until they received their own distinctive versi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Howard Gilmore
Howard Walter Gilmore (September 29, 1902 – February 7, 1943) was a submarine commander in the United States Navy who posthumously received the Medal of Honor for his self-sacrifice during World War II. Early life and career Howard Gilmore was born in Selma, Alabama, on September 29, 1902, and enlisted in the Navy on November 15, 1920. In 1922 he was appointed to the United States Naval Academy by competitive examination.Blair (1975) pp. 269-270 Standing 34th of a class of 436, Gilmore was commissioned in 1926 and reported to the battleship . Gilmore underwent submarine training during 1930 and in the years that followed served in various submarines and at stations ashore.DANFS Gilmore served as the executive officer of the submarine , and in a near-fatal incident during the submarine's shakedown cruise, narrowly survived an assault by a group of thugs in Panama, who cut his throat during an excursion ashore. He had to deal with several other instances of tragedy in his life, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
German Submarine U-68 (1940)
German submarine ''U-68'' was a Type IXC U-boat of Nazi Germany's '' Kriegsmarine'' during World War II. The submarine was laid down on 20 April 1940 at the DeSchiMAG AG Weser yard at Bremen as yard number 987, launched on 22 October and commissioned on 1 January 1941 under the command of ''Korvettenkapitän'' Karl-Friedrich Merten as part of 2nd U-boat Flotilla. ''U-68'' conducted ten combat patrols, sinking 32 merchant ships, for a total of ; she also sank one auxiliary warship of . She was a member of one wolfpack. On 10 April 1944, during her tenth patrol, she was sunk northwest of Madeira by US aircraft from the escort carrier . Design German Type IXC submarines were slightly larger than the original Type IXBs. ''U-68'' had a displacement of when at the surface and while submerged. The U-boat had a total length of , a pressure hull length of , a beam of , a height of , and a draught of . The submarine was powered by two MAN M 9 V 40/46 supercharged four-stro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Attack Submarine
An attack submarine or hunter-killer submarine is a submarine specifically designed for the purpose of attacking and sinking other submarines, surface combatants and merchant vessels. In the Soviet and Russian navies they were and are called "multi-purpose submarines". They are also used to protect friendly surface combatants and missile submarines. Some attack subs are also armed with cruise missiles, increasing the scope of their potential missions to include land targets. Attack submarines may be either nuclear-powered or diesel-electric ("conventionally") powered. In the United States Navy naming system, and in the equivalent NATO system (STANAG 1166), nuclear-powered attack submarines are known as SSNs and their anti-submarine (ASW) diesel-electric predecessors are SSKs. In the US Navy, SSNs are unofficially called "fast attacks". History Origins During World War II, submarines that fulfilled the offensive surface attack role were termed fleet submarines in the U ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Periscope Depth
A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position. In its simplest form, it consists of an outer case with mirrors at each end set parallel to each other at a 45° angle. This form of periscope, with the addition of two simple lenses, served for observation purposes in the trenches during World War I. Military personnel also use periscopes in some gun turrets and in armoured vehicles. More complex periscopes using prisms or advanced fiber optics instead of mirrors and providing magnification operate on submarines and in various fields of science. The overall design of the classical submarine periscope is very simple: two telescopes pointed into each other. If the two telescopes have different individual magnification, the difference between them causes an overall magnification or reduction. Early examples Johannes Hevelius described an early ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chief Engineer
A chief engineer, commonly referred to as "ChEng" or "Chief", is the most senior engine officer of an engine department on a ship, typically a merchant ship, and holds overall leadership and the responsibility of that department..Chief engineer's rank is equivalent to the rank of a ship's captain. As a person who holds one of the most senior roles on the ship, they must have excellent communication and leadership skills. They will be expected to regularly work alongside other crew members and external consultants, and most importantly, provide guidance to their team. To be a chief engineer, an engineer must attain a chief engineer's license appropriate to the tonnage, power rating, and type of ship that they are employed on. A chief engineer is ultimately responsible for all operations and maintenance that has to do with any and all engineering equipment throughout the entire ship, and supervises all other engineering officer and engine ratings within the department. United St ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ostrich
Ostriches are large flightless birds of the genus ''Struthio'' in the order Struthioniformes, part of the infra-class Palaeognathae, a diverse group of flightless birds also known as ratites that includes the emus, rheas, and kiwis. There are two living species of ostrich: the common ostrich, native to large areas of sub-Saharan Africa and the Somali ostrich, native to the Horn of Africa. The common ostrich was also historically native to the Arabian Peninsula, and ostriches were present across Asia as far east as Mongolia during the Late Pleistocene and possibly into the Holocene. They lay the largest eggs of any living land animal. With the ability to run at 70 km/h (43.5 mph), they are the fastest birds on land. They are farmed worldwide, particularly for their feathers as they are used as decoration and feather dusters. Their skin is also used for leather products. They are the heaviest living birds. Taxonomic history The genus ''Struthio'' was first desc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuclear Submarine
A nuclear submarine is a submarine powered by a nuclear reactor, but not necessarily nuclear-armed. Nuclear submarines have considerable performance advantages over "conventional" (typically diesel-electric) submarines. Nuclear propulsion, being completely independent of air, frees the submarine from the need to surface frequently, as is necessary for conventional submarines. The large amount of power generated by a nuclear reactor allows nuclear submarines to operate at high speed for long periods, and the long interval between refuelings grants a range virtually unlimited, making the only limits on voyage times being imposed by such factors as the need to restock food or other consumables. The limited energy stored in electric batteries means that even the most advanced conventional submarine can only remain submerged for a few days at slow speed, and only a few hours at top speed, though recent advances in air-independent propulsion have somewhat ameliorated this disadv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
German Submarine U-505
''U-505'' is a German Type IXC submarine built for Germany's ''Kriegsmarine'' during World War II. She was captured by the U.S. Navy on 4 June 1944. In her uniquely unlucky career with the ''Kriegsmarine'', she had the distinction of being the "most heavily damaged U-boat to successfully return to port" in World War II on her fourth patrol, and the only submarine in which a commanding officer took his own life in combat conditions on her tenth patrol, following six botched patrols. She was captured on 4 June 1944 by United States Navy Task Group 22.3 (TG 22.3), one of six U-boats that were captured by Allied forces during World War II. All but one of ''U-505''s crew were rescued by the Navy task group. The submarine was towed to Bermuda in secret and her crew were interned at a US prisoner of war camp, where they were denied access to International Red Cross visits. The Navy classified the capture as top secret and prevented the Germans from discovering it. In 1954, ''U-505'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diving Plane
Diving planes, also known as hydroplanes, are control surfaces found on a submarine which allow the vessel to pitch its bow and stern up or down to assist in the process of submerging or surfacing the boat, as well as controlling depth when submerged. Bow and stern planes Diving planes are usually fitted in two pairs, the '' bow planes'' at the front of the submarine and the ''stern planes'' at the rear. The stern planes function in much the same way as an aircraft's elevator. As the planes are a long distance fore-and-aft from the hull's centre of buoyancy, they introduce a pitching moment. Ballast tanks within the submarine adjust buoyancy to be neutral, making the boat controllable. The position of the planes controls the pitch of the boat and, with the forward motion of the boat, this controls depth. If not carefully controlled, this could lead to a 'porpoising' motion whereby the planesman continually hunts for a stable combination of depth and pitch. For easier berthi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
_at_the_submarine_base_at_New_Farm%2C_Australia%2C_in_February_1943.jpg "Click for more on -> Howard Gilmore")
