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Avion De Transport Supersonique Futur
The Avion de Transport Supersonique Futur (ATSF) also known as ''Alliance'', was a concept design for supersonic transport that was being worked on by both British Aerospace and Aérospatiale. The aircraft was to be based on the experience learned from the supersonic Concorde, and was to fly at a top speed of roughly Mach 2. Preliminary designs were produced, with some wind-tunnel testing of small-scale models, but development apparently stalled in the early 2000s. History By the mid-1980s, it was recognised that Concorde, the first long-serving supersonic transport, had achieved a niche level of profitability on the busiest Transatlantic routes, but that the airliner had not attracted the widespread use that had been hoped, in part due to political complications and poor economic situation following the 1973 oil crisis. Furthermore, during this era, various organisations were undertaking projects, such as the National Aero-Space Plane in the United States, which were aimed at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Supersonic Transport
A supersonic transport (SST) or a supersonic airliner is a civilian supersonic aircraft designed to transport passengers at speeds greater than the speed of sound. To date, the only SSTs to see regular service have been Concorde and the Tupolev Tu-144. The last passenger flight of the Tu-144 was in June 1978 and it was last flown in 1999 by NASA. Concorde's last commercial flight was in October 2003, with a November 26, 2003 ferry flight being its last airborne operation. Following the permanent cessation of flying by Concorde, there are no remaining SSTs in commercial service. Several companies have each proposed a supersonic business jet, which may bring supersonic transport back again. Supersonic airliners have been the objects of numerous recent and ongoing design studies. Drawbacks and design challenges are excessive noise generation (at takeoff and due to sonic booms during flight), high development costs, expensive construction materials, high fuel consumption, extremel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boundary Layer Control
Boundary layer control refers to methods of controlling the behaviour of fluid flow boundary layers. It may be desirable to reduce flow separation on fast vehicles to reduce the size of the wake (streamlining), which may reduce drag. Boundary layer separation is generally undesirable in aircraft high lift coefficient systems and jet engine intakes. Laminar flow produces less skin friction than turbulent but a turbulent boundary layer transfers heat better. Turbulent boundary layers are more resistant to separation. The energy in a boundary layer may need to be increased to keep it attached to its surface. Fresh air can be introduced through slots or mixed in from above. The low momentum layer at the surface can be sucked away through a perforated surface or bled away when it is in a high pressure duct. It can be scooped off completely by a diverter or internal bleed ducting. Its energy can be increased above that of the free stream by introducing high velocity air. Nature Fra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Delta-wing Aircraft
A delta wing is a wing shaped in the form of a triangle. It is named for its similarity in shape to the Greek uppercase letter delta (letter), delta (Δ). Although long studied, it did not find significant applications until the Jet Age, when it proved suitable for high-speed Subsonic aircraft, subsonic and supersonic flight. At the other end of the speed scale, the Rogallo wing, Rogallo flexible wing proved a practical design for the hang glider and other ultralight aircraft. The delta wing form has unique aerodynamic characteristics and structural advantages. Many design variations have evolved over the years, with and without additional stabilising surfaces. General characteristics Structure The long root chord of the delta wing and minimal structure outboard make it structurally efficient. It can be built stronger, stiffer and at the same time lighter than a swept wing of equivalent lifting capability. Because of this it is easy and relatively inexpensive to build – a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Supersonic Transport
A supersonic transport (SST) or a supersonic airliner is a civilian supersonic aircraft designed to transport passengers at speeds greater than the speed of sound. To date, the only SSTs to see regular service have been Concorde and the Tupolev Tu-144. The last passenger flight of the Tu-144 was in June 1978 and it was last flown in 1999 by NASA. Concorde's last commercial flight was in October 2003, with a November 26, 2003 ferry flight being its last airborne operation. Following the permanent cessation of flying by Concorde, there are no remaining SSTs in commercial service. Several companies have each proposed a supersonic business jet, which may bring supersonic transport back again. Supersonic airliners have been the objects of numerous recent and ongoing design studies. Drawbacks and design challenges are excessive noise generation (at takeoff and due to sonic booms during flight), high development costs, expensive construction materials, high fuel consumption, extremel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High Speed Civil Transport
The High Speed Civil Transport (HSCT), a supersonic airliner, was the focus of the High-Speed Research (HSR) Program, a NASA program to develop the technology needed to design and build a supersonic transport that would be environmentally acceptable and economically feasible. The aircraft was to be a future supersonic passenger aircraft, baselined to cruise at Mach 2.4, or more than twice the speed of sound. The project started in 1990 and ended during 1999. The goal was to employ up-to-date technologies. It was intended to cross the Atlantic or the Pacific Ocean in half the time of a non-supersonic aircraft. It was also intended to be fuel efficient, carry 300 passengers, and to allow customers to buy tickets at a price only slightly higher than those of subsonic aircraft. The goal was to provide sufficient technology for an industry-led product launch decision in 2002, and if a product was launched, a maiden flight within 20 years. The program was based on the successes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DASA
''Dasa'' ( sa, दास, Dāsa) is a Sanskrit word found in ancient Indian texts such as the ''Rigveda'' and ''Arthasastra''. It usually means "enemy" or "servant" but ''dasa'', or ''das'', also means a "servant of God", "devotee," "votary" or "one who has surrendered to God". Dasa may be a suffix of a given name to indicate a "servant" of a revered person or a particular deity. ''Dasa'', in some contexts, is also related to ''dasyu'' and ''asura'', which have been translated by some scholars as "demon", "harmful supernatural forces", "slave", "servant" or "barbarian", depending on the context in which the word is used.Wash Edward Hale (1999), Ásura- in Early Vedic Religion, Motilal Barnarsidass, , pages 159-169 Etymology ''Dāsa'' first appears in Vedic texts from the second millennium BCE. There is no consensus on its origins. Karl Heinrich Tzschucke in 1806, in his translations of the Roman geographer Pomponius Mela, noted etymological and phonological parallels between '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
General Electric
General Electric Company (GE) is an American multinational conglomerate founded in 1892, and incorporated in New York state and headquartered in Boston. The company operated in sectors including healthcare, aviation, power, renewable energy, digital industry, additive manufacturing and venture capital and finance, but has since divested from several areas, now primarily consisting of the first four segments. In 2020, GE ranked among the Fortune 500 as the 33rd largest firm in the United States by gross revenue. In 2011, GE ranked among the Fortune 20 as the 14th most profitable company, but later very severely underperformed the market (by about 75%) as its profitability collapsed. Two employees of GE – Irving Langmuir (1932) and Ivar Giaever (1973) – have been awarded the Nobel Prize. On November 9, 2021, the company announced it would divide itself into three investment-grade public companies. On July 18, 2022, GE unveiled the brand names of the companies it will ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pratt And Whitney
Pratt & Whitney is an American aerospace manufacturer with global service operations. It is a subsidiary of Raytheon Technologies. Pratt & Whitney's aircraft engines are widely used in both civil aviation (especially airlines) and military aviation. Its headquarters are in East Hartford, Connecticut.Contact Us ." Pratt & Whitney. Retrieved on January 7, 2011. "Corporate Headquarters Pratt & Whitney 400 Main Street East Hartford, CT 06108." As one of the "big three" aero-engine manufacturers, it competes with and , although it has also formed joint ventures with both ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rolls-Royce
Rolls-Royce (always hyphenated) may refer to: * Rolls-Royce Limited, a British manufacturer of cars and later aero engines, founded in 1906, now defunct Automobiles * Rolls-Royce Motor Cars, the current car manufacturing company incorporated in 1998, a subsidiary of BMW Group * Rolls-Royce Motors, owner of the former car division incorporated in 1973, bought by Vickers in 1980, a subsidiary of Volkswagen Group from 1998 to 2002 * List of Rolls-Royce motor cars Aerospace and nuclear power * Rolls-Royce Holdings plc, an aerospace, power systems and defence company and Rolls-Royce's current principal operating company **Rolls-Royce Deutschland ***Rolls-Royce Power Systems ** Rolls-Royce Marine Power Operations ** Rolls-Royce North America ** Rolls-Royce Turbomeca ** Rolls-Royce Kamawea, now Kamewa ** Rolls-Royce Controls and Data Services See also * Rose Royce, an American soul and R&B group * Roll (other) * Royce (other) Markus Bennett is an American hip-hop re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SNECMA
Safran Aircraft Engines, previously Snecma (''Société nationale d'études et de construction de moteurs d'aviation'') or Snecma Moteurs, is a French aerospace engine manufacturer headquartered in Courcouronnes and a subsidiary of Safran. It designs, manufactures and maintains aircraft engines, engines for commercial and military aircraft as well as rocket engines for launch vehicles and satellites. Some of its notable developments, alone or in partnership, include the Dassault Rafale's Snecma M88, M88 engine, the Concorde's Rolls-Royce/Snecma Olympus 593, Olympus 593, the CFM56/CFM International LEAP, CFM-LEAP for single-aisle airliners, and the Ariane 5's Vulcain (rocket engine), Vulcain engine. The company employs around 15,700 people across 35 production sites, offices, and Maintenance, repair and operations, MRO facilities worldwide and files an average of nearly 500 patents each year. Safran Aircraft Engines also notably operates two joint ventures with GE Aviation: CF ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turbofan
The turbofan or fanjet is a type of airbreathing jet engine that is widely used in aircraft engine, aircraft propulsion. The word "turbofan" is a portmanteau of "turbine" and "fan": the ''turbo'' portion refers to a gas turbine engine which achieves mechanical energy from combustion, and the ''fan'', a ducted fan that uses the mechanical energy from the gas turbine to force air rearwards. Thus, whereas all the air taken in by a turbojet passes through the combustion chamber and turbines, in a turbofan some of that air bypasses these components. A turbofan thus can be thought of as a turbojet being used to drive a ducted fan, with both of these contributing to the thrust. The ratio of the mass-flow of air bypassing the engine core to the mass-flow of air passing through the core is referred to as the bypass ratio. The engine produces thrust through a combination of these two portions working together; engines that use more Propelling nozzle, jet thrust relative to fan thrust are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turbojet
The turbojet is an airbreathing jet engine which is typically used in aircraft. It consists of a gas turbine with a propelling nozzle. The gas turbine has an air inlet which includes inlet guide vanes, a compressor, a combustion chamber, and a turbine (that drives the compressor). The compressed air from the compressor is heated by burning fuel in the combustion chamber and then allowed to expand through the turbine. The turbine exhaust is then expanded in the propelling nozzle where it is accelerated to high speed to provide thrust. Two engineers, Frank Whittle in the United Kingdom and Hans von Ohain in Germany, developed the concept independently into practical engines during the late 1930s. Turbojets have poor efficiency at low vehicle speeds, which limits their usefulness in vehicles other than aircraft. Turbojet engines have been used in isolated cases to power vehicles other than aircraft, typically for attempts on land speed records. Where vehicles are "turbine-powere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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