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D'Estienne D'Orves-class Aviso
The ''D'Estienne d'Orves''-class avisos, also known as the A69 type avisos, is a Ship class, class of French Navy avisos, comparable in size to a light corvette, mainly designed for coastal anti-submarine defence, but are also available for high sea escort missions, notably in support missions with the Strategic Oceanic Force, Strategic Oceanic Force (FOST). Built on a simple and robust design, they have an economical and reliable propulsion system which allows them to be used for overseas presence missions. In addition to service in France, they have been ordered by the South African Navy (not delivered), Argentinian Navy and Turkish Navy. The class takes its name from the lead ship, named in honour of Honoré d'Estienne d'Orves, a French naval officer and member of the French Resistance. Design and description The ''D'Estienne d'Orves''-class avisos were primarily designed for anti-submarine warfare (ASW) in coastal areas and colonial coastal patrol. They were ordered as replace ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arsenal De Lorient
Naval Group is a major French industrial Corporate group, group specializing in navy, naval defense industry, defense design, development and shipbuilding, construction. Its headquarters are located in Paris. Heir to the French naval dockyards initiated in 1631 by Cardinal Richelieu and to the Direction des Constructions et Armes Navales (''DCAN''), which became Direction des Constructions Navales (''DCN'') in 1991 and then DCNS in 2007, the company was rebranded ''Naval Group'' in 2017. Its two main shareholders are the Agence des participations de l'État, French State (62.25%) and Thales Group (35%). In 2024, Naval Group employs 15,261 people across 17 countries. History Naval Group has a heritage of almost 400 years. Major shipyards were built in France in Brest (1631), Nantes-Indret (1771), Lorient (1778) and, subsequently, Cherbourg (1813). Others were to follow. As early as 1926, what we know as the Naval Group today already had all the facilities now owned by the group ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corvette
A corvette is a small warship. It is traditionally the smallest class of vessel considered to be a proper (or " rated") warship. The warship class above the corvette is that of the frigate, while the class below was historically that of the sloop-of-war. The modern roles that a corvette fulfills include coastal patrol craft, missile boat and fast attack craft. These corvettes are typically between 500 and 2,000 tons. Recent designs of corvettes may approach 3,000 tons and include a hangar to accommodate a helicopter, having size and capabilities that overlap with smaller frigates. However unlike contemporary frigates, a modern corvette does not have sufficient endurance or seaworthiness for long voyages. The word "corvette" is first found in Middle French, a diminutive of the Dutch word ''corf'', meaning a "basket", from the Latin ''corbis''. The rank " corvette captain", equivalent in many navies to " lieutenant commander", derives from the name of this type of ship. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fin Stabiliser
A vertical stabilizer or tail fin is the static part of the vertical tail of an aircraft. The term is commonly applied to the assembly of both this fixed surface and one or more movable rudders hinged to it. Their role is to provide control, stability and trim in yaw (also known as directional or weathercock stability). It is part of the aircraft empennage, specifically of its stabilizers. The vertical tail is typically mounted on top of the rear fuselage, with the horizontal stabilizers mounted on the side of the fuselage (a configuration termed "conventional tail"). Other configurations, such as T-tail or twin tail, are sometimes used instead. Vertical stabilizers have occasionally been used in motor sports, with for example in Le Mans Prototype racing. Function Principle The vertical tail of an aircraft typically consists of a fixed vertical stabilizer or fin on which a movable rudder is mounted. A trim tab may similarly be mounted on the rudder. Together, their ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Controllable Pitch Propeller
Controllability is an important property of a control system and plays a crucial role in many regulation problems, such as the stabilization of unstable systems using feedback, tracking problems, obtaining optimal control strategies, or, simply prescribing an input that has a desired effect on the state. Controllability and observability are dual notions. Controllability pertains to regulating the state by a choice of a suitable input, while observability pertains to being able to know the state by observing the output (assuming that the input is also being observed). Broadly speaking, the concept of controllability relates to the ability to steer a system around in its configuration space using only certain admissible manipulations. The exact definition varies depending on the framework or the type of models dealt with. The following are examples of variants of notions of controllability that have been introduced in the systems and control literature: * State controllability ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Draft (hull)
The draft or draught of a ship is a determined depth of the vessel below the waterline, measured vertically to its hull's lowest—its propellers, or keel, or other reference point. Draft varies according to the loaded condition of the ship. A deeper draft means the ship will have greater vertical depth below the waterline. Draft is used in under keel clearance calculations, where the draft is calculated with the available depth of water (from Electronic navigational charts) to ensure the ship can navigate safely, without grounding. Navigators can determine their draught by calculation or by visual observation (of the ship's painted load lines). Related terminology A ship's draft/draught is the "depth of the vessel below the waterline measured vertically to the lowest part of the hull, propellers, or other reference point". That is, the draft or draught is the maximum depth of any part of the vessel, including appendages such as rudders, propellers and drop keels if de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beam (nautical)
The beam of a ship is its width at its widest point. The maximum beam (BMAX) is the distance between planes passing through the outer sides of the ship, beam of the hull (BH) only includes permanently fixed parts of the hull, and beam at waterline (BWL) is the maximum width where the hull intersects the surface of the water. Generally speaking, the wider the beam of a ship (or boat), the more initial stability it has, at the expense of secondary stability in the event of a capsize, where more energy is required to right the vessel from its inverted position. A ship that heels on her ''beam ends'' has her deck beams nearly vertical. Typical values Typical length-to-beam ratios ( aspect ratios) for small sailboats are from 2:1 (dinghies to trailerable sailboats around ) to 5:1 (racing sailboats over ). Large ships have widely varying beam ratios, some as large as 20:1. Rowing shells designed for flatwater racing may have length to beam ratios as high as 30:1, while a cora ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Displacement (ship)
The displacement or displacement tonnage of a ship is its weight. As the term indicates, it is measured indirectly, using Archimedes' principle, by first calculating the volume of water displaced by the ship, then converting that value into weight. Traditionally, various measurement rules have been in use, giving various measures in long tons. Today, tonnes are more commonly used. Ship displacement varies by a vessel's degree of load, from its empty weight as designed (known as "lightweight tonnage") to its maximum load. Numerous specific terms are used to describe varying levels of load and trim, detailed below. Ship displacement should not be confused with measurements of volume or capacity typically used for commercial vessels and measured by tonnage: net tonnage and gross tonnage. Calculation The process of determining a vessel's displacement begins with measuring its draft.George, 2005. p. 5. This is accomplished by means of its "draft marks". A merchant vessel has t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Escorteur
The French term ''Escorteur'' (Escort Ship) appeared during the World War II, Second World War to designate a warship, of a medium or light Displacement (ship), displacement, whose mission was to protect ocean convoys and naval squadrons from attacks by submarines. This role was in general handled by a destroyer escort such as the and es built in the United States, or a built by the United Kingdom, or even a built by the United Kingdom, Canada and Australia. The Imperial Japanese Navy used the designation ''kaibokan'' for this type of ship. The escorteurs of the French Navy In the immediate aftermath of the war, to fulfill the task of naval escorts, the French Navy was limited to a fleet of ''torpilleur'' and ''contre-torpilleur'' (otherwise known as destroyers), along with a number of avisos. They were later joined by several naval ships of German and Italian origin awarded as war reparations, and several escort ''bâtiments'' originated from the United Kingdom and the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anti-submarine Warfare
Anti-submarine warfare (ASW, or in the older form A/S) is a branch of underwater warfare that uses surface warships, aircraft, submarines, or other platforms, to find, track, and deter, damage, or destroy enemy submarines. Such operations are typically carried out to protect friendly shipping and coastal facilities from submarine attacks and to overcome blockades. Successful ASW operations typically involve a combination of sensor and weapon technologies, along with effective deployment strategies and sufficiently trained personnel. Typically, sophisticated sonar equipment is used for first detecting, then classifying, locating, and tracking a target submarine. Sensors are therefore a key element of ASW. Common weapons for attacking submarines include torpedoes and naval mines, which can both be launched from an array of air, surface, and underwater platforms. ASW capabilities are often considered of significant strategic importance, particularly following provocative instanc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
French Resistance
The French Resistance ( ) was a collection of groups that fought the German military administration in occupied France during World War II, Nazi occupation and the Collaboration with Nazi Germany and Fascist Italy#France, collaborationist Vichy France, Vichy regime in France during the World War II, Second World War. Resistance Clandestine cell system, cells were small groups of armed men and women (called the Maquis (World War II), Maquis in rural areas) who conducted guerrilla warfare and published Underground press, underground newspapers. They also provided first-hand intelligence information, and escape networks that helped Allies of World War II, Allied soldiers and airmen trapped behind Axis powers, Axis lines. The Resistance's men and women came from many parts of French society, including émigrés, academics, students, aristocrats, conservative Catholic Church in France, Roman Catholics (including clergy), Protestantism in France, Protestants, History of the Jews in F ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Honoré D'Estienne D'Orves
Henri Louis Honoré, comte d'Estienne d'Orves (; 5 June 1901 – 29 August 1941) was a French Navy officer and one of the major heroes of the French Resistance, said to be the "first martyr of Free France". Early life He was born in Verrières-le-Buisson (now in the Essonne department). Educated in a conservative Catholic family, he was a remote cousin of writers Antoine de Saint-Exupéry and Louise de Vilmorin, later companion of André Malraux. Estienne d'Orves spent the First World War as a high school student at the prestigious Lycée Louis-le-Grand and the Lycée Saint-Louis-de-Gonzague in Paris, and entered the École Polytechnique in 1921. He joined the ''École Navale'', (French Naval Academy), two years later, becoming an '' enseigne de vaisseau de 2e classe'' in October 1923 and joining the school ship ''Jeanne d'Arc''. He was then an officer on the battleship ''Provence'', and several other vessels. In 1929, he married Éliane de Lorgeril, with whom he had five chi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turkish Navy
The Turkish Naval Forces (), or Turkish Navy (), is the naval warfare service branch of the TAF. The modern naval traditions and customs of the Turkish Navy can be traced back to 10 July 1920, when it was established as the ''Directorate of Naval Affairs'' during the Turkish War of Independence led by Mustafa Kemal Atatürk. Since July 1949, the service has been officially known as the ''Turkish Naval Forces''. In 2008, the Turkish Navy had a reported active personnel strength of 48,600; this figure included an Amphibious Marines Brigade as well as several Special Forces and Commando detachments. As of early 2021, the navy operates a wide variety of ships and 60 maritime aircraft. History Ottoman fleet after Mudros Following the demise of the Ottoman Empire in the aftermath of World War I, on 3 November 1918, the fleet commander of the Ottoman Navy, rear admiral Arif Pasha, ordered all flags to be struck on all warships lying in the Golden Horn, and the Ottoman Navy c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
