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Flettner Rotor
A Flettner rotor is a smooth cylinder with disc end plates which is spun along its long axis and, as air passes at right angles across it, the Magnus effect causes an aerodynamic force to be generated in the direction perpendicular to both the long axis and the direction of airflow.Seifert, Jost;A review of the Magnus effect in aeronautics, '' Progress in Aerospace Sciences'' Vol. 55, 2012, pp.17–45. The rotor sail is named after the German aviation engineer and inventor Anton Flettner, who started developing the rotor sail in the 1920s. In a rotor ship, the rotors stand vertically and lift is generated at right angles to the wind, to drive the ship forwards. In a rotor airplane, the rotor extends sideways in place of a wing and upwards lift is generated. Magnus effect The Magnus effect is named after Gustav Magnus, the German physicist who investigated it. It describes the force generated by fluid flow over a rotating body, at right angles to both the direction of flow ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Buckau Flettner Rotor Ship LOC 37764u
Buckau is a river of Brandenburg, Germany. It flows into the Breitlingsee, which is drained by the Havel, near Brandenburg an der Havel. See also *List of rivers of Brandenburg A list of rivers of Brandenburg, Germany: A * Alte Oder * Alte Schlaube B * Bäke * Berste *Black Elster * Briese * Buckau D * Dahme * Demnitz *Döllnfließ * Dömnitz * Dorche * Dosse E *Elbe *Elde F * Finow * Fredersdorfer Mühlenfließ G ... References Rivers of Brandenburg Rivers of Germany {{Brandenburg-river-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lift (force)
When a fluid flows around an object, the fluid exerts a force on the object. Lift is the Euclidean_vector#Decomposition_or_resolution, component of this force that is perpendicular to the oncoming flow direction. It contrasts with the drag (physics), drag force, which is the component of the force parallel to the flow direction. Lift conventionally acts in an upward direction in order to counter the force of gravity, but it is defined to act perpendicular to the flow and therefore can act in any direction. If the surrounding fluid is air, the force is called an aerodynamic force. In water or any other liquid, it is called a Fluid dynamics, hydrodynamic force. Dynamic lift is distinguished from other kinds of lift in fluids. Aerostatics, Aerostatic lift or buoyancy, in which an internal fluid is lighter than the surrounding fluid, does not require movement and is used by balloons, blimps, dirigibles, boats, and submarines. Planing (boat), Planing lift, in which only the lower po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fluid Dynamics
In physics, physical chemistry and engineering, fluid dynamics is a subdiscipline of fluid mechanics that describes the flow of fluids – liquids and gases. It has several subdisciplines, including (the study of air and other gases in motion) and (the study of water and other liquids in motion). Fluid dynamics has a wide range of applications, including calculating forces and moment (physics), moments on aircraft, determining the mass flow rate of petroleum through pipeline transport, pipelines, weather forecasting, predicting weather patterns, understanding nebulae in interstellar space, understanding large scale Geophysical fluid dynamics, geophysical flows involving oceans/atmosphere and Nuclear weapon design, modelling fission weapon detonation. Fluid dynamics offers a systematic structure—which underlies these practical disciplines—that embraces empirical and semi-empirical laws derived from flow measurement and used to solve practical problems. The solution to a fl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Savonius Wind Turbine
Savonius wind turbines are a type of vertical-axis wind turbine (VAWT), used for converting the force of the wind into torque on a rotating shaft. The turbine consists of a number of aerofoils, usually—but not always—vertically mounted on a rotating shaft or framework, either ground stationed or tethered in airborne systems. Origin The Savonius wind turbine was invented by the Finnish engineer Sigurd Johannes Savonius in 1922 and patented in 1926. Europeans had earlier experimented with curved blades on vertical wind turbines for many decades. The earliest mention is by the Bishop of Csanád County, Fausto Veranzio, who was also an engineer. He wrote in his 1616 book ''Machinae novae'' about several vertical axis wind turbines with curved or V-shaped blades. None of his or any other earlier examples reached the state of development achieved by Savonius. In his biography, there is mention of his intention to develop a turbine-type rotor similar to the Flettner rotor, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sigurd Johannes Savonius
Sigurd Johannes Savonius (2 November 1884 – 31 May 1931) was a Finnish people, Finnish architect and inventor. He is known especially for the Savonius wind turbine, which he invented in 1924. Life and work Savonius was born in Hämeenlinna, Grand Duchy of Finland, to Albin Laurentius Johannes Savonius (1856–1906) and his wife Anna Elisabeth née Rydman (1859–1921). He was one of three sons, together with his brothers Maximilian Lars Helge and Odert Albin. As a young man he enjoyed experimenting with explosives. One such experiment, an attempt to mix red phosphorus with a knife and fork, cost him two fingers and the sight in his right eye. Savonius graduated from secondary school in Helsinki in 1901. Although he had originally planned to become an engineer, he decided to study architecture and graduated in 1906 with a degree in architecture from Helsinki Polytechnic. Nevertheless, he usually referred to himself as an engineer and occupied himself mainly wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Aviation Historian
''The'' is a grammatical article in English, denoting nouns that are already or about to be mentioned, under discussion, implied or otherwise presumed familiar to listeners, readers, or speakers. It is the definite article in English. ''The'' is the most frequently used word in the English language; studies and analyses of texts have found it to account for seven percent of all printed English-language words. It is derived from gendered articles in Old English which combined in Middle English and now has a single form used with nouns of any gender. The word can be used with both singular and plural nouns, and with a noun that starts with any letter. This is different from many other languages, which have different forms of the definite article for different genders or numbers. Pronunciation In most dialects, "the" is pronounced as (with the voiced dental fricative followed by a schwa) when followed by a consonant sound, and as (homophone of the archaic pronoun ''thee' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caudron C
The Société des Avions Caudron was a French aircraft company founded in 1909 as the Association Aéroplanes Caudron Frères by brothers Gaston and René Caudron. It was one of the earliest aircraft manufacturers in France and produced planes for the military in both World War I and World War II. From 1933 onwards, it was a subsidiary of Renault. Alphonse (Gaston) (1882–1915) and René Caudron (1884–1959) Born in Favières, Somme to parents who farmed nearby in Romiotte, the Caudron brothers were educated at a college in Abbeville. Gaston, as Alphonse was always known, intended to become an engineer but his education was cut short by health problems; René was interested in the development of mechanics and was a sportsman. After military service in an artillery regiment, they returned to work on the farm. They began to build their first aircraft, a large biplane, in August 1908. Initially unable to obtain an engine, they flew it as a glider, towed by a horse, and tested it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Butler Ames
Butler Ames (August 22, 1871 – November 6, 1954) was an American politician, engineer, soldier and businessman. He was the son of Adelbert Ames and grandson of Benjamin Franklin Butler, both decorated generals in the Union Army during the American Civil War. Born in Lowell, Massachusetts, Ames attended the public schools and Phillips Exeter Academy, in Exeter, New Hampshire, and graduated from the United States Military Academy at West Point in 1894. He resigned from the United States Army after appointment as second lieutenant to the Eleventh Regiment, United States Infantry; took a postgraduate course at Massachusetts Institute of Technology, was a member of Theta Xi fraternity, and graduated in 1896 as a mechanical and electrical engineer. Ames engaged in manufacturing; served as a member of the common council of Lowell in 1896; like his father, he re-joined the Army during the Spanish–American War and was commissioned lieutenant and adjutant of the Sixth Regiment, Mass ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flettner Rotor Aircraft
Anton Flettner, Flugzeugbau GmbH was a German helicopter and autogyro manufacturer during World War II, founded by Anton Flettner. Flettner aircraft included: *Flettner Fl 184 - Reconnaissance autogyro, prototype *Flettner Fl 185 - Reconnaissance helicopter, prototype *Flettner Fl 265 - Reconnaissance helicopter, prototype *Flettner Fl 282 ''Kolibri'' (Hummingbird) - Reconnaissance helicopter *Flettner Fl 339 - Reconnaissance helicopter, project *Flettner Gigant - Experimental helicopter Anton Flettner's interest in aerodynamics (specifically the Magnus effect, which produces a force from a cylinder rotating in a fluid flow) also led him to invent the Flettner rotor which he used to power a Flettner ship which crossed the Atlantic, and the Flettner ventilator which is still widely used as a cooling device for buses, vans and other commercial vehicles and which is based upon the Savonius principle. See also * Gyrodyne * List of RLM aircraft designations References Defunct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eclipse (yacht)
M/Y ''Eclipse'' is a superyacht built by Blohm+Voss of Hamburg, Germany, the third longest yacht afloat. Her exterior and interior were designed by Terence Disdale. The yacht is owned by Russian businessman Roman Abramovich, and was delivered on 9 December 2010. At long ''Eclipse'' was the List of motor yachts by length, world's longest private yacht until was launched in April 2013, which is longer. The yacht's cost has been estimated at €340 million. Features ''Eclipse'' has two helicopter pads, 24 guest cabins, two swimming pools, several hot tubs, and a disco hall. She is also equipped with three launch boats and a mini-submarine that is capable of submerging to . Approximately 70 crew members are needed to operate the yacht and serve the guests. For security, ''Eclipse'' is fitted with a missile detection system and self-defense systems. By 2009, ''Eclipse'' was also the largest vessel employing a rotor-based Stabilizer (ship), stabilization system against Ship ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
YouTube
YouTube is an American social media and online video sharing platform owned by Google. YouTube was founded on February 14, 2005, by Steve Chen, Chad Hurley, and Jawed Karim who were three former employees of PayPal. Headquartered in San Bruno, California, it is the second-most-visited website in the world, after Google Search. In January 2024, YouTube had more than 2.7billion monthly active users, who collectively watched more than one billion hours of videos every day. , videos were being uploaded to the platform at a rate of more than 500 hours of content per minute, and , there were approximately 14.8billion videos in total. On November 13, 2006, YouTube was purchased by Google for $1.65 billion (equivalent to $ billion in ). Google expanded YouTube's business model of generating revenue from advertisements alone, to offering paid content such as movies and exclusive content produced by and for YouTube. It also offers YouTube Premium, a paid subs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Downforce
Downforce is a downwards lift force created by the aerodynamic features of a vehicle. If the vehicle is a car, the purpose of downforce is to allow the car to travel faster by increasing the vertical force on the tires, thus creating more grip. If the vehicle is a fixed-wing aircraft, the purpose of the downforce on the horizontal stabilizer is to maintain longitudinal stability and allow the pilot to control the aircraft in pitch. Fundamental principles The same principle that allows an airplane to rise off the ground by creating lift from its wings is used in reverse to apply force that presses the race car against the surface of the track. This effect is referred to as "aerodynamic grip" and is distinguished from "mechanical grip", which is a function of the car's mass, tires, and suspension. The creation of downforce by passive devices can be achieved only at the cost of increased aerodynamic drag (or friction), and the optimum setup is almost always a compromise betwee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
