|
U-2511
German submarine ''U-2511'' was a Type XXI submarine of Nazi Germany's ''Kriegsmarine'' during World War II. The '' Elektroboot'' submarine was laid down on 7 July 1944 at the Blohm & Voss yard at Hamburg, launched on 2 September 1944, and commissioned on 29 September 1944 under the command of ''Kapitänleutnant'' Adalbert Schnee. Design Like all Type XXI submarines, ''U-2511'' had a displacement of when at the surface and while submerged. She had a total length of ( o/a), a beam of , and a draught of . The submarine was powered by two MAN SE supercharged six-cylinder M6V40/46KBB diesel engines each providing , two Siemens-Schuckert GU365/30 double-acting electric motors each providing , and two Siemens-Schuckert silent running GV232/28 electric motors each providing . The submarine had a maximum surface speed of and a submerged speed of . When running on silent motors the boat could operate at a speed of . When submerged, the boat could operate at for ; when surfaced, sh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adalbert Schnee
Otto Adalbert Schnee (31 December 1913 – 4 November 1982) was a ''Korvettenkapitän'' (corvette captain) with Nazi Germany's ''Kriegsmarine'' during World War II. He commanded the submarines , , , and , sinking twenty-one merchant ships on twelve patrols, for a total of of Allied shipping, and received the Knight's Cross with Oak Leaves. Career Schnee was a member of Hitler’s Nazi party. He joined the ''Reichsmarine'' in April 1934. After serving aboard the light cruiser , he transferred to the U-boat arm in May 1937. He spent two years on board the Type IIB U-boat , under the command of ''Oberleutnant zur See'' Otto Kretschmer, completing five combat patrols as 1.WO (second-in-command), between October 1939 and January 1940. Schnee's first command, from January to July 1940, was the Type IIA submarine , in which he sailed on only a single short patrol in April supporting "Operation Weserübung" (the invasion of Norway). His next command, between July and October ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Type XXI Submarine
Type XXI submarines were a class of German diesel–electric '' Elektroboot'' (German: "electric boat") submarines designed during the Second World War. One hundred and 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 way ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
31st U-boat Flotilla
''31st U-boat Flotilla'' ("31. Unterseebootsflottille") was a training flotilla ("''Ausbildungsflottille''") of Nazi Germany's ''Kriegsmarine'' during World War II. The flotilla was formed in Hamburg in September 1943 under the command of ''Kapitän zur See'' Bruno Mahn. Later based at Wilhelmshaven, and then Wesermünde, it was commanded by Carl Emmermann for the final month of the war. It was disbanded in May 1945 when Germany surrendered. Flotilla commanders *''Kapitän zur See'' Bruno Mahn (September 1943–April 1945) *''Korvettenkapitän'' Carl Emmermann Carl Emmermann (6 March 1915 – 25 March 1990) was a German U-boat commander during World War II. In his time as commander, submarines under his command sank 27 ships for a total tonnage of . Career Emmermann began his naval career in 1934. For ... (April–May 1945) Assigned U-boats 156 U-boats were assigned to this flotilla during its service. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
11th U-boat Flotilla
The 11th U-boat Flotilla (German language, German ''11. Unterseebootsflottille'') was formed on 15 May 1942 in Bergen, Bergen, Norway. The flotilla operated mainly in the North Sea and against the Arctic convoys of World War II, Russian convoys (JW, PQ, QP and RA series) in the Arctic Sea. The flotilla operated various marks of the Type VII U-boat until September 1944, when it had an influx of some Type IX U-boat, Type IX boats from France. It also was the only flotilla to field the Type XXI U-boat for operational use, but the war ended before saw action. The Flotilla was disbanded on 9 May 1945 with the German surrender. Flotilla commanders External links * * U-boat flotillas, 11 Military units and formations of the Kriegsmarine Military units and formations established in 1942 Military units and formations disestablished in 1945 1942 establishments in Norway {{Germany-mil-unit-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elektroboot
An elektroboot ("electric boat" in German) was a submarine designed to operate entirely submerged, rather than as submersibles that could submerge as a temporary means to escape detection or launch an attack. History Even before the Second World War the rocket designer Hellmuth Walter had been advocating the use of hydrogen peroxide (known as ''perhydrol'') as a fuel. His engines were to become famous for their use in rocket-powered aircraft—notably the Me 163 Komet—but most of his early efforts were spent on systems for submarine propulsion. In these cases the hydrogen peroxide was reduced chemically and the resulting gases used to spin a turbine at about 20,000 rpm, which was then geared to a propeller. This allowed the submarine to run underwater at all times, as there was no need for air to run the engines. The system also used up tremendous amounts of fuel, and any boat based on the design would either have to be huge or have limited range. Thus the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Londonderry Port
Londonderry Port, now operating as Foyle Port, is a port located on Lough Foyle in Northern Ireland. It is the United Kingdom’s most westerly port and an important northerly port on the island of Ireland. The current port is at Lisahally, County Londonderry, though historically the port was upriver in the city of Derry itself. It is operated by the Londonderry Port and Harbour Commissioners, whose former offices, just north of the city's walls, are now a museum. History The River Foyle has been an entryport since before the time of Saint Columba, and was used by the Vikings and the Normans. At the time the river was wider and more shallow, and as ships grew larger, they would anchor close in to shore and unload by lighter. The planting of the walled city on the west bank of the Foyle necessitated a more efficient approach, and the port of Londonderry was created in 1664 by the charter granted by King Charles II to the Londonderry Corporation making them responsible for its r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Naval Mine
A naval mine is a self-contained explosive device placed in water to damage or destroy surface ships or submarines. Unlike depth charges, mines are deposited and left to wait until they are triggered by the approach of, or contact with, any vessel or a particular vessel type, akin to anti-infantry vs. anti-vehicle mines. Naval mines can be used offensively, to hamper enemy shipping movements or lock vessels into a harbour; or defensively, to protect friendly vessels and create "safe" zones. Mines allow the minelaying force commander to concentrate warships or defensive assets in mine-free areas giving the adversary three choices: undertake an expensive and time-consuming minesweeping effort, accept the casualties of challenging the minefield, or use the unmined waters where the greatest concentration of enemy firepower will be encountered. Although international law requires signatory nations to declare mined areas, precise locations remain secret; and non-complying individuals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anti-aircraft Warfare
Anti-aircraft warfare, counter-air or air defence forces is the battlespace response to aerial warfare, defined by NATO as "all measures designed to nullify or reduce the effectiveness of hostile air action".AAP-6 It includes surface based, subsurface ( submarine launched), and air-based weapon systems, associated sensor systems, command and control arrangements, and passive measures (e.g. barrage balloons). It may be used to protect naval, ground, and air forces in any location. However, for most countries, the main effort has tended to be homeland defence. NATO refers to airborne air defence as counter-air and naval air defence as anti-aircraft warfare. Missile defence is an extension of air defence, as are initiatives to adapt air defence to the task of intercepting any projectile in flight. In some countries, such as Britain and Germany during the Second World War, the Soviet Union, and modern NATO and the United States, ground-based air defence and air defence airc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2 Cm FlaK 30
The Flak 30 (''Flugzeugabwehrkanone 30'') and improved Flak 38 were 20 mm anti-aircraft guns used by various German forces throughout World War II. It was not only the primary German light anti-aircraft gun but by far the most numerously produced German artillery piece throughout the war. It was produced in a variety of models, notably the Flakvierling 38 which combined four Flak 38 autocannons onto a single carriage. Development The Germans fielded the unrelated early 2 cm Flak 28 just after World War I, but the Treaty of Versailles outlawed these weapons and they were sold to Switzerland. The original Flak 30 design was developed from the Solothurn ST-5 as a project for the Kriegsmarine, which produced the 20 mm C/30. The gun fired the "Long Solothurn", a 20 × 138 mm belted cartridge that had been developed for the ST-5 and was one of the more powerful 20 mm rounds. The C/30, featuring a barrel length of 65 calibres, had a fire rate of ab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silent Running (submarine)
Silent running is a stealth mode of operation for naval submarines. The aim is to evade discovery by passive sonar by eliminating superfluous noise: nonessential systems are shut down, the crew is urged to rest and refrain from making any unnecessary sound, and speed is greatly reduced to minimize propeller noise. The protocol has been in use since the latter part of World War I, when hydrophones were invented to detect U-boats. The propellers have a characteristic RPM band in which no cavitation noise arises. Since this rotation speed is usually relatively low, the first electric submarines had special "silent running" engines designed for optimum performance at reduced speed. These required less active cooling (further reducing noise), and were generally equipped with plain bearings rather than ball bearings. These engines were also acoustically decoupled from the hull, as they employed belt transmission rather than direct coupling to the propeller shaft. Nuclear submarines can r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Motor–generator
A motor–generator (an M–G set) is a device for converting electrical power to another form. Motor–generator sets are used to convert frequency, voltage, or phase of power. They may also be used to isolate electrical loads from the electrical power supply line. Large motor–generators were widely used to convert industrial amounts of power while smaller motor–generators (such as the one shown in the picture) were used to convert battery power to higher DC voltages. While a motor–generator set may consist of distinct motor and generator machines coupled together, a single unit dynamotor (for dynamo–motor) has the motor coils and the generator coils wound around a single rotor; both the motor and generator therefore share the same outer field coils or magnets.Radio Amateur's Handbook 1976, pub. |
