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Hydrofoil Catamarans
A hydrofoil is a lifting surface, or foil, that operates in water. They are similar in appearance and purpose to aerofoils used by aeroplanes. Boats that use hydrofoil technology are also simply termed hydrofoils. As a hydrofoil craft gains speed, the hydrofoils lift the boat's hull out of the water, decreasing drag and allowing greater speeds. Description The hydrofoil usually consists of a winglike structure mounted on struts below the hull, or across the keels of a catamaran in a variety of boats (see illustration). As a hydrofoil-equipped watercraft increases in speed, the hydrofoil elements below the hull(s) develop enough lift to raise the hull out of the water, which greatly reduces hull drag. This provides a corresponding increase in speed and fuel efficiency. Wider adoption of hydrofoils is prevented by the increased complexity of building and maintaining them. Hydrofoils are generally prohibitively more expensive than conventional watercraft above a certain displa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Foil (fluid Mechanics)
A foil is a solid object with a shape such that when placed in a moving fluid at a suitable angle of attack the lift (force generated perpendicular to the fluid flow) is substantially larger than the drag (force generated parallel to the fluid flow). If the fluid is a gas, the foil is called an airfoil or aerofoil, and if the fluid is water the foil is called a hydrofoil. Physics of foils A foil generates lift primarily because of its shape and angle of attack. When oriented at a suitable angle, the foil deflects the oncoming fluid, resulting in a force on the foil in the direction opposite to the deflection. This force can be resolved into two components: lift and drag. This "turning" of the fluid in the vicinity of the foil creates curved streamlines which results in lower pressure on one side and higher pressure on the other. This pressure difference is accompanied by a velocity difference, via Bernoulli's principle, so for foils with positive angles-of attack, and oth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Density
Density (volumetric mass density or specific mass) is the substance's mass per unit of volume. The symbol most often used for density is ''ρ'' (the lower case Greek letter rho), although the Latin letter ''D'' can also be used. Mathematically, density is defined as mass divided by volume: : \rho = \frac where ''ρ'' is the density, ''m'' is the mass, and ''V'' is the volume. In some cases (for instance, in the United States oil and gas industry), density is loosely defined as its weight per unit volume, although this is scientifically inaccurate – this quantity is more specifically called specific weight. For a pure substance the density has the same numerical value as its mass concentration. Different materials usually have different densities, and density may be relevant to buoyancy, purity and packaging. Osmium and iridium are the densest known elements at standard conditions for temperature and pressure. To simplify comparisons of density across different s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
De Dion-Bouton
De Dion-Bouton was a French automobile manufacturer and railcar manufacturer operating from 1883 to 1953. The company was founded by the Marquis Jules-Albert de Dion, Georges Bouton, and Bouton's brother-in-law Charles Trépardoux. Steam cars The company was formed in 1883 after de Dion saw a toy locomotive in a store window in 1881 and asked the toymakers to build another. Engineers Bouton and Trépardoux had been eking out a living with scientific toys at a shop in the Passage de Léon, near "rue de la Chapelle" in Paris.Wise, p. 510. Trépardoux had long dreamed of building a steam car, but neither could afford it. De Dion, already inspired by steam (in the form of rail locomotives)Georgano, p. 27. and with ample money, agreed, and De Dion, Bouton et Trépardoux was formed in Paris in 1883. This became the De Dion-Bouton automobile company, the world's largest automobile manufacturer for a time, becoming well known for their quality, reliability, and durability. Before 1883 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles De Lambert (aviator)
Charles, Count de Lambert (30 December 1865, in Funchal – 26 February 1944, in Saint-Sylvain-d'Anjou) was an early European aviator. In 1904 Count Lambert built an experimental hydrofoil boat which was first tested in May 1904 on the River Seine near Paris. It had twin hulls and was powered by a 14HP De Dion-Bouton motor. Even with this modest power it was able to rise up on the hydrofoils until the hull just skimmed the water with only the propeller below the surface reaching a speed of 20 mph. De Lambert was the first person in France to be taught to fly by Wilbur Wright. The first lesson took place at Le Mans on 28 October 1908, and by August 1909 he owned 2 Wright biplanes.Count Lambert's Idiosyncracy, Westminster Gazette, 26 Aug 1909, p5 On 18 October 1909 de Lambert "left the Juvisy Aerodrome at 4:36 o'clock in a Wright machine, flew across Paris to the Eiffel Tower, circled it, and returned to his starting point, arriving safely at 5:25." De Lambert claimed that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paris
Paris () is the capital and most populous city of France, with an estimated population of 2,165,423 residents in 2019 in an area of more than 105 km² (41 sq mi), making it the 30th most densely populated city in the world in 2020. Since the 17th century, Paris has been one of the world's major centres of finance, diplomacy, commerce, fashion, gastronomy, and science. For its leading role in the arts and sciences, as well as its very early system of street lighting, in the 19th century it became known as "the City of Light". Like London, prior to the Second World War, it was also sometimes called the capital of the world. The City of Paris is the centre of the Île-de-France region, or Paris Region, with an estimated population of 12,262,544 in 2019, or about 19% of the population of France, making the region France's primate city. The Paris Region had a GDP of €739 billion ($743 billion) in 2019, which is the highest in Europe. According to the Economist Intelli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
River Seine
) , mouth_location = Le Havre/Honfleur , mouth_coordinates = , mouth_elevation = , progression = , river_system = Seine basin , basin_size = , tributaries_left = Yonne, Loing, Eure, Risle , tributaries_right = Ource, Aube, Marne, Oise, Epte The Seine ( , ) is a river in northern France. Its drainage basin is in the Paris Basin (a geological relative lowland) covering most of northern France. It rises at Source-Seine, northwest of Dijon in northeastern France in the Langres plateau, flowing through Paris and into the English Channel at Le Havre (and Honfleur on the left bank). It is navigable by ocean-going vessels as far as Rouen, from the sea. Over 60 percent of its length, as far as Burgundy, is negotiable by large barges and most tour boats, and nearly its whole length is available for recreational boating; excursion boats offer sightseeing tours of the river banks in the capital city, Paris. There are 37 bridges in Par ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bell HD-4
A bell is a directly struck idiophone percussion instrument. Most bells have the shape of a hollow cup that when struck vibrates in a single strong strike tone, with its sides forming an efficient resonator. The strike may be made by an internal "clapper" or "uvula", an external hammer, or—in small bells—by a small loose sphere enclosed within the body of the bell (jingle bell). Bells are usually cast from bell metal (a type of bronze) for its resonant properties, but can also be made from other hard materials. This depends on the function. Some small bells such as ornamental bells or cowbells can be made from cast or pressed metal, glass or ceramic, but large bells such as a church, clock and tower bells are normally cast from bell metal. Bells intended to be heard over a wide area can range from a single bell hung in a turret or bell-gable, to a musical ensemble such as an English ring of bells, a carillon or a Russian zvon which are tuned to a common scale and installe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Isaac Thornycroft
Sir John Isaac Thornycroft (1 February 1843 – 28 June 1928) was an English shipbuilder, the founder of the Thornycroft shipbuilding company and member of the Thornycroft family. Early life He was born in 1843 to Mary Francis and Thomas Thornycroft. He attended the Regent Street Polytechnic and then the Royal School of Naval Architecture and Marine Engineering at South Kensington and at the same time, he began building the steam launch ''Nautilus'' in his father's study. ''Nautilus'' was a fast boat with a reliable engine (also built by Thornycroft), and in 1862 it proved to be the first steam launch with enough speed to follow the contenders in the University race. The ensuing publicity prompted his father to purchase a strip of land along the Thames, adjacent to Chesterman's yard at Chiswick in 1864, and that became the start of John Thornycroft's shipbuilding career. In 1866 Thornycroft took over Chesterman's yard completely, and John I. Thornycroft & Company was f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Enrico Forlanini
Enrico Forlanini (13 December 1848 – 9 October 1930) was an Italian engineer, inventor and aeronautical pioneer, known for his works on helicopters, aeroplanes, hydrofoils and dirigibles. He was born in Milan. His older brother Carlo Forlanini was a physician. Early life Enrico Forlanini was born to Francesco Forlanini, a notable physician and director of the ''Ospedale Fatebenefratelli'' in Milan. After elementary school he attended one of the three Milan ''Regie Scuole Tecniche'', in 1863 he entered the Military College of Turin. In 1866 he enrolled at the Military Academy of Turin, and become a Lieutenant of Engineers. Enrico enrolled in the ''Scuola di Applicazione Artiglieria e Genio'' (Application School of Artillery and Engineers) in Turin in 1868. Upon graduation in 1870, Forlanini was assigned to Casale Monferrato, where he was able to work in the police station's workshop. He began working on a systematic testing of propellers. He subsequently studied at Polite ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Forlanini Idroplano-Forlani Hydrofoil 1910
Forlanini is an Italian surname. Notable people with the surname include: *Carlo Forlanini (1847–1918), Italian physician *Enrico Forlanini (1848–1930), Italian engineer, inventor, and aeronautical pioneer See also * Forlanini (district of Milan) Forlanini is a district ("quartiere") of Milan, Italy. It is part of the Zone 4 of Milan, Zone 4 administrative division, located east of the city centre. The northern boundary of the district is eponymous Viale Enrico Forlanini, which is the mai ... {{surname Italian-language surnames ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Angle Of Attack
In fluid dynamics, angle of attack (AOA, α, or \alpha) is the angle between a reference line on a body (often the chord line of an airfoil) and the vector representing the relative motion between the body and the fluid through which it is moving. Angle of attack is the angle between the body's reference line and the oncoming flow. This article focuses on the most common application, the angle of attack of a wing or airfoil moving through air. In aerodynamics, angle of attack specifies the angle between the chord line of the wing of a fixed-wing aircraft and the vector representing the relative motion between the aircraft and the atmosphere. Since a wing can have twist, a chord line of the whole wing may not be definable, so an alternate reference line is simply defined. Often, the chord line of the root of the wing is chosen as the reference line. Another choice is to use a horizontal line on the fuselage as the reference line (and also as the longitudinal axis). Some aut ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bernoulli's Principle
In fluid dynamics, Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in static pressure or a decrease in the fluid's potential energy. The principle is named after the Swiss mathematician and physicist Daniel Bernoulli, who published it in his book ''Hydrodynamica'' in 1738. Although Bernoulli deduced that pressure decreases when the flow speed increases, it was Leonhard Euler in 1752 who derived Bernoulli's equation in its usual form. The principle is only applicable for isentropic flows: when the effects of irreversible processes (like turbulence) and non-adiabatic processes (e.g. thermal radiation) are small and can be neglected. Bernoulli's principle can be applied to various types of fluid flow, resulting in various forms of Bernoulli's equation. The simple form of Bernoulli's equation is valid for incompressible flows (e.g. most liquid flows and gases moving at low Mach number). More advanced forms may be applied ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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