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U-864
German submarine ''U-864'' was a Type IXD2 U-boat of Nazi Germany's ''Kriegsmarine'' in World War II. On 9 February 1945, it became the only submarine in history to be sunk by an enemy submarine while both were submerged. ''U-864'' was sunk by the British submarine , and all 73 men on board died. Design German Type IXD2 submarines were considerably larger than the original Type IXs. ''U-864'' 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-stroke, nine-cylinder diesel engines plus two MWM RS34.5S six-cylinder four-stroke diesel engines for cruising, producing a total of for use while surfaced, two Siemens-Schuckert 2 GU 345/34 double-acting electric motors producing a total of for use while submerged. She had two shafts and two propellers. The boat was capable of operating at depths ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Operation Caesar
Operation Caesar () was a secret mission carried out by Germany in the Second World War to supply Japan, with advanced technology. The operation failed due to the sinking of U-864 by a British submarine, the only known example of a submerged submarine sinking another submerged submarine. The operation On 5 December 1944, ''U-864'', on her maiden voyage, was dispatched on a secret mission to deliver supplies to Japan. ''U-864''s primary cargo was advanced Messerschmitt jet engine parts for use in Japanese aircraft and V-2 missile guidance systems. Her secondary cargo comprised of the strategic material mercury in 1,857 canisters for use in weapons production. She left Kiel and headed north. While going through the Kiel Canal, ''U-864'' grounded and damaged her hull. Her captain, Ralf-Reimar Wolfram, decided to sail to the U-boat pens at Bergen, Norway. On 12 January 1945, while ''U-864'' was still undergoing repairs, British bombers attacked the pens, delaying the repairs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sinking Of U-864
During the action of 9 February 1945, , a V-class submarine of the Royal Navy, which was patrolling the waters around Fedje Island, off the Norwegian coast in the North Sea, attacked and sank the German U-boat . The sinking is the only incident where one submarine sank another in combat while both were at periscope depth. Background U-864 60°46′10″N 4°37′15″E ''U-864'' was a Type IX U-boat ( Ralf-Reimar Wolfram) on a clandestine mission, Operation Caesar, to the Empire of Japan. On 6 February 1945, ''U-864'' passed through the Fedje area off the Norwegian coast without being detected but an engine kept misfiring. In 1986, G. P. Jones wrote that sound probably came from "noisy machinery". In 2013, Preisler and Sewell wrote that an air compressor may have been wrongly installed or had worn out causing the engine to misfire with "loud, fitful vibrations". There were many Allied (primarily British) ships, submarines and aircraft in the area on anti-submarine patrol. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ralf-Reimar Wolfram
Ralf-Reimar Wolfram (31 March 1912 – 9 February 1945) was a ''Korvettenkapitän'' during World War II. During his career he commanded two U-boats for a total of 118 days at sea spanning four patrols. During his third patrol he sank the , an American liberty ship. ''Robert Gray'' was a straggler from convoy HX 234 en route to Britain. For Wolfram's fourth patrol, he commanded during Operation Caesar Operation Caesar () was a secret mission carried out by Germany in the Second World War to supply Japan, with advanced technology. The operation failed due to the sinking of U-864 by a British submarine, the only known example of a submerged su .... He was killed when ''U-864'' was sunk by the British submarine . This was the only known instance of one submerged submarine sinking another submerged submarine. ''U-864'' remains Wolfram's grave to this day. References Bibliography * External links Ralf-Reimar Wolfram 1912 births 1945 deaths People from Wilhelmshaven ... [...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 Autonomous underwater vehicle, 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 navy, navies, large and small. Military uses include attacking enemy surface ships (merchant and military) or other submarines, and for aircraft carrier protection, Blockade runner, blockade running, Ballistic missile submarine, nuclear deterrence, reconnaissance, conventio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Torpedo
A modern torpedo is an underwater ranged weapon launched above or below the water surface, self-propelled towards a target, and with an explosive warhead designed to detonate either on contact with or in proximity to the target. Historically, such a device was called an automotive, automobile, locomotive, or fish torpedo; colloquially a ''fish''. The term ''torpedo'' originally applied to a variety of devices, most of which would today be called naval mine, mines. From about 1900, ''torpedo'' has been used strictly to designate a self-propelled underwater explosive device. While the 19th-century battleship had evolved primarily with a view to engagements between armored warships with naval artillery, large-caliber guns, the invention and refinement of torpedoes from the 1860s onwards allowed small torpedo boats and other lighter surface combatant , surface vessels, submarines/submersibles, even improvised fishing boats or frogmen, and later light aircraft, to destroy large shi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
German Type IX Submarine
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 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 or 66 TMB mines. Secondary armament was provided by one deck gun with 180 rounds. Anti-aircraft armament differed throughout the war. They had two periscopes in the towe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
33rd U-boat Flotilla
''33rd U-boat Flotilla'' ("33. Unterseebootsflottille") was a front-line unit of Nazi Germany's '' Kriegsmarine'' during World War II. The flotilla was founded at Flensburg in September 1944 under the command of ''Korvettenkapitän'' Georg Schewe, though ''Korvkpt.'' Günter Kuhnke took over the command in October 1944. The flotilla included U-boats that had been based at the French submarine bases captured by the Allied advance during the Normandy Campaign, as well as U-boats operating in the Indian Ocean (the ''Monsun Gruppe''). The flotilla was disbanded in May 1945 after the German surrender. Flotilla commanders * ''Korvettenkapitän'' Georg Schewe (September–October 1944) * ''Korvettenkapitän'' Günter Kuhnke Günter Kuhnke (7 September 1912 – 11 October 1990) was a German submarine commander during World War II and later a Konteradmiral with the Bundesmarine, West Germany's navy. He was a recipient of the Knight's Cross of the Iron Cross of Nazi Ger ... (Octobe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MWM GmbH
Caterpillar Energy Solutions GmbH, is a mechanical engineering company based in Mannheim, Baden-Württemberg, Germany. It was known as MWM GmbH Motoren-Werke Mannheim (MWM) until November 2013. In 2009 the company was the third-largest producer by revenue of gas and diesel engines. The main focus of production is gas engines and gensets for the generation of electrical energy from 400 to 10,300 kWel per unit. It also provides consulting, designing and engineering, construction and commissioning of plants as well as global after sales service. The company also has its own training center. History In 1922 the department for the construction of stationary engines was outsourced and had its name changed from ''Benz & Cie. Rheinische Gasmotorenfabrik in Mannheim'' to ''Motorenwerke Mannheim''. The renowned German engineer Prosper L'Orange, a pioneer of diesel engine technology, was the technical manager then. Before that he worked for Benz & Cie. The construction of diesel engines ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MAN SE
MAN SE (abbreviation of ''Maschinenfabrik Augsburg-Nürnberg'', ) was a manufacturing and engineering company based in Munich, Germany. Its primary output was commercial vehicles and diesel engines through its MAN Truck & Bus and MAN Latin America divisions, and participation in the manufacturer Sinotruk. MAN SE was majority-owned by Traton, the heavy commercial vehicle subsidiary of automaker Volkswagen AG, until August 2021 when Traton completed a squeeze out of all remaining shareholders and formally merged MAN SE into Traton SE, meaning the former subsidiaries of MAN SE were now directly owned by Traton, and MAN SE ceased to exist. History Foundation MAN traces its origins back to 1758, when the "St. Antony" ironworks commenced operation in Oberhausen, as the first heavy-industry enterprise in the Ruhr region. In 1808, the three ironworks "St. Antony", "Gute Hoffnung" (English: "Good Hope"), and "Neue Essen" (English: "New Forges") merged, to form the Hüttengewerks ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Supercharged
In an internal combustion engine, a supercharger compresses 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 supercharger is a form of forced induction that is mechanically powered (usually by a belt from the engine's crankshaft), as opposed to a turbocharger, which is powered by the kinetic energy of the exhaust gasses. However, up until the mid-20th century, a turbocharger was called a "turbosupercharger" and was considered a type of supercharger. The first supercharged engine was built in 1878, with usage in aircraft engines beginning in the 1910s and usage in car engines beginning in the 1920s. In piston engines used by aircraft, supercharging was often used to compensate for the lower air density at high altitudes. Supercharging is less commonly used in the 21st century, as manufacturers have shifted to turbochargers to reduce fuel consumption and/or increase power outputs. Des ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diesel Engine
The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to mechanical compression; thus, the diesel engine is a so-called compression-ignition engine (CI engine). This contrasts with engines using spark plug-ignition of the air-fuel mixture, such as a petrol engine (gasoline engine) or a gas engine (using a gaseous fuel like natural gas or liquefied petroleum gas). Diesel engines work by compressing only air, or air plus residual combustion gases from the exhaust (known as exhaust gas recirculation (EGR)). Air is inducted into the chamber during the intake stroke, and compressed during the compression stroke. This increases the air temperature inside the cylinder to such a high degree that atomised diesel fuel injected into the combustion chamber ignites. With the fuel being injected into the air just before combustion, the dispersion of the fuel is une ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nazi Germany
Nazi Germany (lit. "National Socialist State"), ' (lit. "Nazi State") for short; also ' (lit. "National Socialist Germany") (officially known as the German Reich from 1933 until 1943, and the Greater German Reich from 1943 to 1945) was the German state between 1933 and 1945, when Adolf Hitler and the Nazi Party controlled the country, transforming it into a dictatorship. Under Hitler's rule, Germany quickly became a totalitarian state where nearly all aspects of life were controlled by the government. The Third Reich, meaning "Third Realm" or "Third Empire", alluded to the Nazi claim that Nazi Germany was the successor to the earlier Holy Roman Empire (800–1806) and German Empire (1871–1918). The Third Reich, which Hitler and the Nazis referred to as the Thousand-Year Reich, ended in May 1945 after just 12 years when the Allies defeated Germany, ending World War II in Europe. On 30 January 1933, Hitler was appointed chancellor of Germany, the head of gove ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
