|
Submarine Snorkel
A submarine snorkel is a device which allows the engine of a submarine to operate Underwater, submerged while still taking in air from above the surface. British Royal Navy personnel often refer to it as the snort. A concept devised by Dutch engineers, it was widely used on German U-boats during the last year of World War II and known to them as a . History Until the advent of Nuclear submarine, nuclear power, submarines were designed to operate on the surface most of the time and submerge only for evasion or for daylight attacks. Until the widespread use of radar after 1940, at night a submarine was safer on the surface than submerged, because sonar could detect boats underwater but was almost useless against a surface vessel. However, with continued radar improvement as the war progressed, submarines (notably, the Germany, German U-boat, U-boats in the Battle of the Atlantic) were forced to spend more time underwater, running on electric motors that gave speeds of only a fe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
U-3008 Key West
U3 or U-3 may refer to: Transportation * U3, an underground rapid transit line in many major German/Austrian cities: ** U3 (Berlin U-Bahn) ** U3 (Frankfurt U-Bahn) ** U3 (Hamburg U-Bahn) ** U3 (Munich U-Bahn) ** U3 (Nuremberg U-Bahn) ** U3 (Stuttgart Stadtbahn) ** U3 (Vienna U-Bahn) * Avies (IATA code: U3), an Estonian airline * Cessna U-3, the military model of the Cessna 310 aircraft * German submarine U-3, German submarine ''U-3'', one of several German submarines * Boeing customer code, Boeing Customer Code for Garuda Indonesia Computer technology * U3 (software), a design specification for USB storage, created by U3, LLC * U3, SD card#UHS Speed Class, a speed class for Secure Digital (SD) cards * U.3, an improvement to the U.2 storage interface standard Video games * ''Ultima III: Exodus'', a 1983 video game * ''Uncharted 3: Drake's Deception'', a 2011 video game Other * U3, an Unemployment#United States Bureau of Labor statistics, unemployment figure released by the United ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HNLMS O-20
''O 20'', laid down as ''K XX'', was a of the Royal Netherlands Navy that saw service during World War II. ''O 20'' along with her sister ship were the first boats in the world to be equipped with a submarine snorkel that allowed the submarine to run its diesel engines while submerged. Ship history ''O 20'' was laid down 15 June 1936 as ''K XX''. After which at some point she was renamed ''O 20''. She was launched on 31 January 1939, and on 28 August of the same year she was commissioned in the Dutch navy. She was put into a squadron that consisted of two submarines: ''O 20'' and , and the sloop . This squadron departed the Netherlands for the Netherlands West Indies on either 2 or 3 October 1939. By December 1939 ''O 20'' reached the Dutch East Indies via the Panama Canal. World War II On 10 May 1940 Germany attacked the Netherlands. On 7 December 1941, the Japanese attack on Pearl Harbor brought the US into the war. The Netherlands followed suit hours later. By early Decem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gruppenhorchgerät
The ''Gruppenhorchgerät'' ('group listening device', abbreviated GHG) was a hydrophone array which was used on vessels of the German Kriegsmarine in World War II. Development In World War I carbon microphones were still used as sound receivers. The individual receivers were mostly placed in the front part of the vessel along the hull sides to have enough distance from the screw and the noise they emitted. The individual microphones were arranged in groups and each was oriented in a different direction. The individual microphones had to be connected manually to take bearings. They were not very reliable, so other transducers were experimented with. Dynamic microphones were also discarded. At the end of the process, the piezoelectric principle was deemed the most suitable. This was discovered by Pierre Curie in 1880. The quartz crystals generate electric voltage depending on the pressure acting on it. In collaboration with the Imperial German Navy, Atlas Werke AG in Bremen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conning Tower
A conning tower is a raised platform on a ship or submarine, often armoured, from which an officer in charge can conn (nautical), conn (conduct or control) the vessel, controlling movements of the ship by giving orders to those responsible for the ship's engine, rudder, lines, and ground tackle. It is usually located as high on the ship as is practical, to give the conning team good visibility of the entirety of the ship, ocean conditions, and other vessels. The naval term "conn" may derive from the Middle English ''conne'' (study, become acquainted with) or French ''conduire'' from Latin ''conducere'' (conduct). Surface ships On surface ships, the conning tower was a feature of all battleships and armored cruiser, armoured cruisers from about 1860 to the early years of World War II. Located at the front end of the superstructure, the conning tower was a heavily armored cylinder, with tiny slit windows on three sides providing a reasonable field of view. Designed to shield j ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baltic Sea
The Baltic Sea is an arm of the Atlantic Ocean that is enclosed by the countries of Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia, Sweden, and the North European Plain, North and Central European Plain regions. It is the world's largest brackish water basin. The sea stretches from 53°N to 66°N latitude and from 10°E to 30°E longitude. It is a Continental shelf#Shelf seas, shelf sea and marginal sea of the Atlantic with limited water exchange between the two, making it an inland sea. The Baltic Sea drains through the Danish straits into the Kattegat by way of the Øresund, Great Belt and Little Belt. It includes the Gulf of Bothnia (divided into the Bothnian Bay and the Bothnian Sea), the Gulf of Finland, the Gulf of Riga and the Bay of Gdańsk. The "Baltic Proper" is bordered on its northern edge, at latitude 60°N, by Åland and the Gulf of Bothnia, on its northeastern edge by the Gulf of Finland, on its eastern edge by the Gulf of Riga, and in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
German Submarine U-58 (1938)
German submarine ''U-58'' was a Type IIC U-boat of Nazi Germany's ''Kriegsmarine'' that served in the Second World War. She was produced by Deutsche Werke AG, Kiel. Ordered on 17 June 1937, she was laid down on 29 September as yard number 257. She was launched on 12 October 1938 and commissioned on 4 February 1939 under the command of ''Oberleutnant zur See'' Herbert Kuppisch. Design German Type IIC submarines were enlarged versions of the original Type IIs. ''U-58'' had a displacement of when at the surface and while submerged. Officially, the standard tonnage was , however. 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 MWM RS 127 S four-stroke, six-cylinder diesel engines of for cruising, two Siemens-Schuckert PG VV 322/36 double-acting electric motors producing a total of for use while submerged. She had two shafts and two propellers. The boat was capable of operati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Type XXIII U-boat
German Type XXIII submarines were the first so-called elektroboote ("electric boats") to become operational. They were small coastal submarines designed to operate in the shallow waters of the North Sea, Black Sea and Mediterranean Sea, where larger Type XXI electric boats were at risk in World War II. They were so small they could carry only two torpedoes, which had to be loaded externally. As with their far larger sisters—the Type XXI—they were able to remain submerged almost all of the time and were faster than conventional U-boats, due to the improved streamlining of their shape, batteries with larger capacity and the snorkel, which allowed the diesel engines to be used while submerged. The Type XXI and XXIII U-boats revolutionized post-war submarine design. Nearly a thousand Type XXIII boats were projected towards the close of World War II, but most of these were either cancelled, scrapped incomplete, or only projected. Background When development began on the Type XX ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Type XXI U-boat
Type XXI submarines were a class of German diesel–electric '' Elektroboot'' (German: "electric boat") submarines designed during the Second World War. One hundred eighteen were completed, with four being combat-ready. During the war only two were put into active service and went on patrols, but these were not used in combat. They were the first submarines designed to operate primarily submerged, rather than spending most of their time as surface ships that could submerge for brief periods as a means of escaping detection. They incorporated many batteries to increase the time they could spend submerged, to as much as several days, and they only needed to surface to periscope depth for recharging via a snorkel. The design included many general improvements as well: much greater underwater speed by an improved hull design, greatly improved diving times, power-assisted torpedo reloading and greatly improved crew accommodations. However, the design was also flawed in many ways, wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Type IX U-boat
The Type IX U-boat was designed by Nazi Germany's ''Kriegsmarine'' in 1935 and 1936 as a large ocean-going submarine for sustained operations far from the home support facilities. Type IX boats were briefly used for patrols off the eastern United States in an attempt to disrupt the stream of troops and supplies bound for Europe. It was derived from the Type I submarine, Type IA and appeared in various sub-types. Type IXs had six torpedo tubes; four at the bow and two at the stern. They carried six reloads internally and had five external torpedo containers (three at the stern and two at the bow) which stored ten additional torpedoes. The total of 22 torpedoes allowed U-boat commanders to follow a convoy and strike night after night. Some of the IXC boats were fitted for mine operations; as mine-layers they could carry 44 TMA mine, TMA or 60 TMB mines. Secondary armament was provided by one 10.5 cm SK C/32 naval gun, deck gun with 180 rounds. Anti-aircraft armament differed thr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Type VII U-boat
Type VII U-boats were the most common type of German World War II U-boat. 704 boats were built by the end of the war. The type had several modifications. The Type VII was the most numerous U-boat type to be involved in the Battle of the Atlantic. The lone surviving example, , is on display at the Laboe Naval Memorial located in Laboe, Schleswig-Holstein, Germany. At the start of the Second World War the ''Type VII'' class wastogether with the British ''U'', ''S'' and ''T'' class and Dutch ''O 21'' classone of the most advanced submarine classes in service. Design After the defeat in World War I, the Treaty of Versailles forbade Germany to build submarines. Germany circumvented the treaty by setting up the Dutch dummy company ''NV Ingenieurskantoor voor Scheepsbouw Den Haag'' (I.v.S) which continued to design submarines. Based on the World War I design of the Type UB III and its never-built successors Type UF and Type UG, IVS designed the Vetehinen-class submarine and i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kriegsmarine
The (, ) was the navy of Nazi Germany from 1935 to 1945. It superseded the Imperial German Navy of the German Empire (1871–1918) and the inter-war (1919–1935) of the Weimar Republic. The was one of three official military branch, branches, along with the and the , of the , the German armed forces from 1935 to 1945. In violation of the Treaty of Versailles, the grew rapidly during German rearmament, German naval rearmament in the 1930s. The 1919 treaty had limited the size of the German navy and prohibited the building of submarines. ships were deployed to the waters around Spain during the Spanish Civil War (1936–1939) under the guise of enforcing non-intervention in the Spanish Civil War, non-intervention, but in reality supporting the Francoist Spain, Nationalists against the Second Spanish Republic, Spanish Republicans. In January 1939, Plan Z, a massive shipbuilding programme, was ordered, calling for surface naval parity with the United Kingdom, British Royal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Battle Of The Netherlands
The German invasion of the Netherlands (), otherwise known as the Battle of the Netherlands (), was a military campaign, part of Battle of France, Case Yellow (), the Nazi German invasion of the Low Countries (Belgium, Luxembourg, and the Netherlands) and French Third Republic, France during World War II. The battle lasted from 10 May 1940 until the surrender of the main Dutch forces on 14 May. Dutch troops in the province of Zeeland, Zealand continued to resist the Wehrmacht until 17 May, when Germany completed its occupation of the whole country. The invasion of the Netherlands saw some of the earliest mass paratroop drops, to occupy tactical points and assist the advance of ground troops. The German Luftwaffe used paratroopers in the capture of several airfields in the vicinity of Rotterdam and The Hague, helping to quickly overrun the country and immobilise Dutch forces. After the devastating German bombing of Rotterdam, Nazi bombing of Rotterdam by the Luftwaffe on 14 May ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
