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Voith Schneider Propeller
The Voith Schneider Propeller (VSP) is a specialized marine propulsion system (MPS) manufactured by the Voith Group based on a cyclorotor design. It is highly maneuverable, being able to change the direction of its thrust almost instantaneously. It is widely used on tugs and ferries. Operation From a circular plate, rotating around a vertical axis, a circular array of vertical blades (in the shape of hydrofoils) protrude out of the bottom of the ship. Each blade can rotate itself around a vertical axis. The internal gear changes the angle of attack of the blades in sync with the rotation of the plate, so that each blade can provide thrust in any direction. Unlike the azimuth thruster (where a conventional propeller is rotated about the vertical axis to direct its thrust, allowing a vessel to steer without the use of a rudder), the Voith-Schneider drive merely requires changing the pattern of orientation of the vertical blades. In a marine situation, this provides for a drive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fall Of Warness
Muckle Green Holm is an uninhabited island in the North Isles of the Orkney archipelago in Scotland. It is roughly in extent and rises to above sea level, the summit having a triangulation pillar. Name 'Muckle' is Scots for 'big' or 'large'; 'holm' is from the Old Norse ''holmr'', a small and rounded islet. Geography To the south lies Little Green Holm, and between the two is the Sound of Green Holms. Eastward is a strait called Fall of Warness between Muckle Green Holm and the much larger island of Eday. Muckle Green Holm has a great cormorant colony and a population of European otters. Tidal power The Fall of Warness has strong tidal currents suitable for tidal power. Starting in 2007, the European Marine Energy Centre installed tidal power testing equipment. In 2021, Orbital Marine Power installed a tidal turbine called Orbital O2 that supplies 2MW to the electrical grid. See also List of Orkney islands This is a list of Orkney islands in Scotland. The Orkne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
German Aircraft Carrier Graf Zeppelin
The German aircraft carrier ''Graf Zeppelin'' was the lead ship in a class of two carriers of the same name ordered by the ''Kriegsmarine'' of Nazi Germany. She was the only aircraft carrier launched by Germany and represented part of the ''Kriegsmarine''s attempt to create a well-balanced oceangoing fleet, capable of projecting German naval power far beyond the narrow confines of the Baltic and North Seas. The carrier would have had a complement of 42 fighters and dive bombers. Construction on ''Graf Zeppelin'' began on 28 December 1936, when her keel was laid down at the Deutsche Werke shipyard in Kiel. Named in honor of ''Graf'' (Count) Ferdinand von Zeppelin, the ship was launched on 8 December 1938, and was 85% complete by the outbreak of World War II in September 1939. ''Graf Zeppelin'' was not completed and was never operational due to shifting construction priorities necessitated by the war. She remained in the Baltic for the duration of the war; with Germany's defeat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MV Lymington
MV ''Lymington'' is a former ro-ro ferry, built in 1938 to serve the Isle of Wight. She is Britain's earliest example of a Voith Schneider driven ferry. Renamed MV ''Sound of Sanda'' in 1974, she served Western Ferries on the Upper Clyde until 1993. History MV ''Lymington'' was built in 1938 as an Isle of Wight ferry. She was the first British vessel driven by Voith Schneider propulsion units. Throughout the war, she was on the Lymington- Yarmouth service on the Solent. A slab of concrete placed above her wheelhouse offered some protection against an airborne attack. By 1972, ''Lymington'' was too small for her owners' needs. The arrival of new ferries led to her being withdrawn and placed on the sale list. She was bought by Western Ferries for their new crossing from Hunter's Quay to McInroy's Point. Returning to the Clyde, she was modified to suit her new owner's needs and renamed ''Sound of Sanda''. She served Western Ferries faithfully from late August 1974 until 1989, lat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
German Minesweeper M-1
German minesweeper ''M-1'' was a M 1935-class minesweeper of Nazi Germany's Kriegsmarine in World War II. History Laid down in 1936, ''M-1'' was launched on 5 March 1937. Commissioned on 1 September 1938 under the command of ''Oberleutnant zur See'' Hans Bartels, she was used to transfer the Marinestosstruppkompanie to the battleship on 24 August 1939 in preparation for the Invasion of Poland. After service in the campaign, ''M-1'' was relocated to the North Sea. In February 1940, ''M-1'' sank four Esbjerg fish trawlers, ''Ejjam'' (E 92), ''Gerlis'' (E 456), ''Merkator'' (348), and ''Polaris'' (E 504), killing all 16 crew members. Bartels later justified his decision with military necessity, as the neutral fishermen allegedly send coded messages to alert British forces to his presence on the Doggerbank. After the German attack on the Soviet Union, ''M-1'' was part of the naval component of Operation Siegfried, the occupation of the islands Dagö, Ösel, and Moon. Soon a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
M Class Minesweeper (Germany)
The M class were the standard minesweeper (german: Minensuchboot) of Nazi Germany's ''Kriegsmarine'' during World War II. The vessels were the primary force in Germany's harbor defense command and were organized administratively into minesweeper flotillas. History M1915 and M1916 A total of 36 old units from World War I served in World War II. Some of these were converted to experimental ships, artillery school ships, fleet tenders or R-boat tenders, and 1 (ex-M109) was converted into a survey ship. In 1940, most of these converted vessels were re-designated as minesweepers again. M1935 The first series; the M1935 were ordered in the late 1930s to replace worn out World War I vintage boats. These ships proved versatile and seaworthy. The vessels could also undertake convoy escort, anti-submarine warfare and minelaying tasks as well as minesweeping. However, the ships were very expensive and complicated to build, and their oil-fired boilers meant they suffered from the fuel s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deutsche Reichsbahn
The ''Deutsche Reichsbahn'', also known as the German National Railway, the German State Railway, German Reich Railway, and the German Imperial Railway, was the German national railway system created after the end of World War I from the regional railways of the individual states of the German Empire. The ''Deutsche Reichsbahn'' has been described as "the largest enterprise in the capitalist world in the years between 1920 and 1932"; nevertheless its importance "arises primarily from the fact that the Reichsbahn was at the center of events in a period of great turmoil in German history". Overview The company was founded on 1 April 1920 as the ("German Imperial Railways") when the Weimar Republic, which still used the nation-state term of the previous monarchy, (German Reich, hence the usage of the in the name of the railway; the monarchical term was ), took national control of the German railways, which had previously been run by the German states. In 1924 it was reorganise ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lürssen
Lürssen (or Lürssen Werft) is a German shipyard with headquarters in Bremen-Vegesack and shipbuilding facilities in Lemwerder, Berne and Bremen-Fähr-Lobbendorf. Lürssen designs and constructs yachts, naval ships and special vessels. Trading as Lürssen Yachts, it is one of the leading builders of custom superyachts such as Paul Allen's ''Octopus'', David Geffen's ''Rising Sun'', and Khalifa bin Zayed Al Nahyan's ''Azzam'', the second largest private yacht in the world at 180 m in length after the REV Ocean''. History On 27 June 1875 the 24 year-old Friedrich Lürssen set up a boatbuilding workshop in Aumund, a suburb of Bremen, Germany. The focus of work in the first years was on work boats for fishing and ferry operations. Hull number one was a five meter long rowboat. From the 1880s Lürssen opened up the sport boat market. In 1886 the first motorboat in the world was built by Lürssen (according to his own account).''Kölner Stadt-Anzeiger''. 16. September 2011, P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
R Boats
The R boats (''Räumboote'' in German, meaning ''minesweeper'') were a group of small naval vessels built as minesweepers for the '' Kriegsmarine'' (German navy) before and during the Second World War. They were used for several purposes during the war, and were also used post-war by the German Mine Sweeping Administration for clearing naval mines. In 1954, the Indonesian Navy ordered 10 ''Pulau Rau''-class minesweepers to Abeking & Rasmussen in West Germany. The ''Pulau Rau''-class were modified R boats armed with one Bofors 40mm L/60 Mk 3 gun, two Oerlikon 20mm/70 Mk 10 guns and also mechanical minesweeping gear. Operational use A total of 424 boats were built for the '' Kriegsmarine'' before and during World War II. The German Navy used them in every theatre including the Baltic, Mediterranean, the Arctic and the Black Sea. In addition to its designed use as minesweepers, these boats were used for convoy escort, coastal patrol, minelaying and air-sea rescue. About 140 R b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Constance
Lake Constance (german: Bodensee, ) refers to three Body of water, bodies of water on the Rhine at the northern foot of the Alps: Upper Lake Constance (''Obersee''), Lower Lake Constance (''Untersee''), and a connecting stretch of the Rhine, called the Seerhein, Lake Rhine (''Seerhein''). These waterbodies lie within the Lake Constance Basin () in the Alpine Foreland through which the Rhine flows. The lake is situated where Germany, Switzerland, and Austria meet. Its shorelines lie in the German states of Baden-Württemberg and Bavaria, the Swiss cantons of Canton of St. Gallen, St. Gallen, Canton of Thurgau, Thurgau, and Canton of Schaffhausen, Schaffhausen, and the Austrian state of Vorarlberg. The actual location of the border Lake_Constance#International_borders, is disputed. The Alpine Rhine forms in its original course the Austro-Swiss border and flows into the lake from the south. The High Rhine flows westbound out of the lake and forms (with the exception of the Canton ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Propeller
A propeller (colloquially often called a screw if on a ship or an airscrew if on an aircraft) is a device with a rotating hub and radiating blades that are set at a pitch to form a helical spiral which, when rotated, exerts linear thrust upon a working fluid such as water or air. Propellers are used to pump fluid through a pipe or duct, or to create thrust to propel a boat through water or an aircraft through air. The blades are specially shaped so that their rotational motion through the fluid causes a pressure difference between the two surfaces of the blade by Bernoulli's principle which exerts force on the fluid. Most marine propellers are screw propellers with helical blades rotating on a propeller shaft (ship), propeller shaft with an approximately horizontal axis. History Early developments The principle employed in using a screw propeller is derived from sculling. In sculling, a single blade is moved through an arc, from side to side taking care to keep presenting the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
