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Droop Nose (aeronautics)
The droop nose is a feature fitted to a small number of aircraft types so the nose of the aircraft can be lowered during takeoff and landing to improve the pilot's view of the ground below. This feature is used with a very-low aspect ratio wing such as a delta wing. It is installed in aircraft capable of supersonic speeds but is lowered only during low-speed operation such as takeoff and landing. Droop noses have typically been installed on supersonic airliners such as Concorde and the Tupolev Tu-144; and high-speed experimental aircraft, such as the record-breaking Fairey Delta 2 and the Sukhoi T-4 strategic bomber. History The first supersonic delta to receive a drooped nose was the Fairey Delta 2, a British experimental high-speed aircraft. Nicknamed "Droop Snoot," the Delta 2 featured a relatively long tapered nose, which smoothly flowed into its cylindrical cross-section fuselage, to generate a high level of aerodynamic efficiency.Wood 1975, p. 75. It was recogn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fairey FD2 XG774 Farnborough 08
Fairey may refer to: People * Charles Richard Fairey, British aircraft manufacturer * David Fairey, English cricketer * Francis Fairey (1887 - 1971), Canadian politician * Jim Fairey, baseball player * Mike Fairey, British businessman *Shepard Fairey, American artist, designed the Barack Obama "Hope" poster Companies * Fairey Aviation Company, British aircraft company **Avions Fairey Avions Fairey was the Belgian-based subsidiary of the British Fairey Aviation that built aircraft for the Belgian government. It subsequently separated from the UK parent and became SONACA. History In the late 1920s, the ''Aéronautique Mil ..., the Belgian-based subsidiary of the British Fairey Aviation Company * Fairey Marine Ltd, a shipbuilding company based on the River Hamble, Southampton, England Aircraft Many "Fairey" aircraft were made by the Fairey Aviation Company — see Fairey Aviation Company § Aircraft Other * Fairey Fireflash was the first British air-to-air missile * Fairey ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Operational Requirement F
An operational definition specifies concrete, replicable procedures designed to represent a construct. In the words of American psychologist S.S. Stevens (1935), "An operation is the performance which we execute in order to make known a concept." For example, an operational definition of "fear" (the construct) often includes measurable physiologic responses that occur in response to a perceived threat. Thus, "fear" might be operationally defined as specified changes in heart rate, electrodermal activity, pupil dilation, and blood pressure. Overview An operational definition is designed to model or represent a concept or theoretical definition, also known as a construct. Scientists should describe the operations (procedures, actions, or processes) that define the concept with enough specificity such that other investigators can replicate their research. Operational definitions are also used to define system states in terms of a specific, publicly accessible process of preparati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Periscope
A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position. In its simplest form, it consists of an outer case with mirrors at each end set parallel to each other at a 45° angle. This form of periscope, with the addition of two simple lenses, served for observation purposes in the trenches during World War I. Military personnel also use periscopes in some gun turrets and in Armored car (military), armoured vehicles. More complex periscopes using Prism (optics), prisms or advanced Optical fiber, fiber optics instead of mirrors and providing magnification operate on submarines and in various fields of science. The overall design of the classical submarine periscope is very simple: two telescopes pointed into each other. If the two telescopes have different individual magnification, the difference between them causes an overall magnification or reduction. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North American XB-70 Valkyrie
The North American Aviation XB-70 Valkyrie is a retired prototype version of the planned nuclear-armed, deep-penetration supersonic strategic bomber for the United States Air Force Strategic Air Command. Designed in the late 1950s by North American Aviation (NAA) to replace the B-52 Stratofortress and B-58 Hustler, the six-engine, delta-winged Valkyrie could cruise for thousands of miles at Mach 3+ while flying at . At these speeds, it was expected that the B-70 would be practically immune to interceptor aircraft, the only effective weapon against bomber aircraft at the time. The bomber would spend only a brief time over a particular radar station, flying out of its range before the controllers could position their fighters in a suitable location for an interception. Its high speed made the aircraft difficult to see on radar displays and its high-altitude and high-speed capabilities could not be matched by any contemporaneous Soviet interceptor or fighter aircraft. The i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canard (aeronautics)
In aeronautics, a canard is a wing configuration in which a small forewing or foreplane is placed forward of the main wing of a fixed-wing aircraft or a weapon. The term "canard" may be used to describe the aircraft itself, the wing configuration, or the foreplane.Clancy, L. J. (1975). ''Aerodynamics'', Pitman (UK), Halsted (US), 1975. Pages 292-3.. Canard wings are also extensively used in guided missiles and smart bombs. The term "canard" arose from the appearance of the Santos-Dumont 14-bis of 1906, which was said to be reminiscent of a duck (''canard'' in French) with its neck stretched out in flight. Despite the use of a canard surface on the first powered aeroplane, the Wright Flyer of 1903, canard designs were not built in quantity until the appearance of the Saab Viggen jet fighter in 1967. The aerodynamics of the canard configuration are complex and require careful analysis. Rather than use the conventional tailplane configuration found on most aircraft, an a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soviet Union
The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet Union, it dissolved in 1991. During its existence, it was the list of countries and dependencies by area, largest country by area, extending across Time in Russia, eleven time zones and sharing Geography of the Soviet Union#Borders and neighbors, borders with twelve countries, and the List of countries and dependencies by population, third-most populous country. An overall successor to the Russian Empire, it was nominally organized as a federal union of Republics of the Soviet Union, national republics, the largest and most populous of which was the Russian SFSR. In practice, Government of the Soviet Union, its government and Economy of the Soviet Union, economy were Soviet-type economic planning, highly centralized. As a one-party state go ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aeroflot Tupolev Tu-144 1977 Volpati-1
PJSC AeroflotRussian Airlines (, ), commonly known as Aeroflot ( or ; , , ), is the flag carrier and the largest airline of Russia. Aeroflot is headquartered in the Central Administrative Okrug, Moscow, with its hub being Sheremetyevo International Airport. The Federal Agency for State Property Management, an agency of the Government of Russia, owns 73.77% of the company, with the rest of the shares being public float. During the time of the Soviet Union, Aeroflot was one of the largest airlines in the world. In 1992, following the dissolution of the Soviet Union, Aeroflot was divided into approximately 400 regional airlines informally known as Babyflots and was restructured into an open joint-stock company. It has a market share in Russia of approximately 42.3%. Including subsidiaries, the company carried 55.3 million passengers in 2024. Aeroflot also owns Rossiya Airlines and Pobeda, a low-cost carrier. The Aeroflot fleet, excluding subsidiaries, includes 171 airplanes: 11 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aerodynamic Drag
In fluid dynamics, drag, sometimes referred to as fluid resistance, is a force acting opposite to the direction of motion of any object moving with respect to a surrounding fluid. This can exist between two fluid layers, two solid surfaces, or between a fluid and a solid surface. Drag forces tend to decrease fluid velocity relative to the solid object in the fluid's path. Unlike other resistive forces, drag force depends on velocity. Drag force is proportional to the relative velocity for low-speed flow and is proportional to the velocity squared for high-speed flow. This distinction between low and high-speed flow is measured by the Reynolds number. Drag is instantaneously related to vorticity dynamics through the Josephson-Anderson relation. Examples Examples of drag include: * Net force, Net Aerodynamic force, aerodynamic or Fluid dynamics, hydrodynamic force: Drag acting opposite to the direction of movement of a solid object such as cars, aircraft, and boat hulls. * Viscou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Streamlined
Streamlines, streaklines and pathlines are field lines in a fluid flow. They differ only when the flow changes with time, that is, when the flow is not steady flow, steady. Considering a velocity vector field in three-dimensional space in the framework of continuum mechanics: * Streamlines are a family of curves whose tangent vectors constitute the velocity vector field of the flow. These show the direction in which a massless fluid element will travel at any point in time. * Streaklines are the Locus (mathematics), loci of points of all the fluid particles that have passed continuously through a particular spatial point in the past. Dye steadily injected into the fluid at a fixed point (as in dye tracing) extends along a streakline. * Pathlines are the trajectory, trajectories that individual fluid particles follow. These can be thought of as "recording" the path of a fluid element in the flow over a certain period. The direction the path takes will be determined by the stre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triplex Safety Glass
Triplex Safety Glass was a British brand of toughened glass and laminated glass. Their marque is often seen on vehicle and aircraft windscreens. History The Triplex Safety Glass Company Ltd was founded in 1912 by Kent-born Reginald Delpech (30 March 1881 - 29 May 1935). The company was established in 1912 to produce laminated windscreens in the UK, under a license from French ''Société du Verre Triplex'' established by French chemist Édouard Bénédictus (1878–1930) who invented laminated glass. On 9 September 1929 Triplex formed a joint venture company with Pilkington in St Helens. The company is now part of Pilkington Automotive. In the 1960s Triplex bought its main competitor British Indestructo Glass, giving it a monopoly in British laminated glass production. In the 1980s, around 1,000 people worked at the Triplex site in St Helens and about 700 at the site in Kings Norton. Pilkington retired the Triplex brand in August 1993. The company was formally dissolved in Se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marshall Aerospace
Marshall Group (registered as Marshall of Cambridge (Holdings) Ltd,) is a British company headquartered in Cambridge, United Kingdom. Subsidiaries include Marshall Aerospace, an aircraft maintenance, modification, and design company located at Cambridge City Airport. Other subsidiaries are Marshall Land Systems (ground defence), Marshall Slingsby Advanced Composites, Marshall Fleet Solutions, Marshall Skills Academy and Marshall Property. Marshall also owns and operates the airport itself. The company was originally founded by David Gregory Marshall in 1909. Initially operating chauffeur services, the firm soon branched out into vehicle repair and dealership activities. During the 1930s, Marshall became increasingly engaged in aviation; by the end of the Second World War, the company had trained in excess of 20,000 aircrew for service within the Royal Air Force. It was also engaged in repair and modification of military aircraft during the conflict. During the postwar era ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
BAC 221
BAC or Bac may refer to: Arts and entertainment Arts centres and arts councils * Balochistan Arts Council, in Quetta, Pakistan * Baryshnikov Arts Center, in Manhattan, New York City * Battersea Arts Centre, London, England * Beirut Art Center, Lebanon * Belger Arts Center, Kansas City, Missouri, US * Benedicta Arts Center, St. Joseph, Minnesota, US * Berkeley Art Center, California, US * Black Arts Council, US * Brampton Arts Council, Ontario, Canada * Brooklyn Arts Council, New York City, New York, US Other uses in arts and entertainment * André Bac (1905–1989), a French cinematographer * Ferdinand Bac (1859–1952), a German-French cartoonist, artist, and writer * BAC Films, a French film production and distribution company * BAC Inc. * '' Batman: Arkham City'', a 2011 video game * Big Apple Chorus, New York–based barbershop chorus * Big Apple Circus * Boston Area Crusaders, former name of the Boston Crusaders Drum and Bugle Corps * Brixton Artists Collective ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
