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Ground Effect (aerodynamics)
For fixed-wing aircraft, ground effect is the reduced aerodynamic drag that an aircraft's wings generate when they are close to a fixed surface.. Reduced drag when in ground effect during takeoff can cause the aircraft to "float" while below the recommended climb speed. The pilot can then fly just above the runway while the aircraft accelerates in ground effect until a safe climb speed is reached.. For rotorcraft, ground effect results in less drag on the rotor during hovering close to the ground. At high weights this sometimes allows the rotorcraft to lift off while stationary in ground effect but does not allow it to transition to flight out of ground effect. Helicopter pilots are provided with performance charts which show the limitations for hovering their helicopter in ground effect (IGE) and out of ground effect (OGE). The charts show the added lift benefit produced by ground effect. For fan- and jet-powered vertical take-off and landing (VTOL) aircraft, ground effect when ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fixed-wing Aircraft
A fixed-wing aircraft is a heavier-than-air flying machine, such as an airplane, which is capable of flight using wings that generate lift caused by the aircraft's forward airspeed and the shape of the wings. Fixed-wing aircraft are distinct from rotary-wing aircraft (in which the wings form a rotor mounted on a spinning shaft or "mast"), and ornithopters (in which the wings flap in a manner similar to that of a bird). The wings of a fixed-wing aircraft are not necessarily rigid; kites, hang gliders, variable-sweep wing aircraft and airplanes that use wing morphing are all examples of fixed-wing aircraft. Gliding fixed-wing aircraft, including free-flying gliders of various kinds and tethered kites, can use moving air to gain altitude. Powered fixed-wing aircraft (airplanes) that gain forward thrust from an engine include powered paragliders, powered hang gliders and some ground effect vehicles. Most fixed-wing aircraft are flown by a pilot on board the craft, but some ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bell X-14
The Bell X-14 (Bell Type 68) is an experimental VTOL aircraft flown in the United States in the 1950s. The main objective of the project was to demonstrate vectored thrust horizontal and vertical takeoff, hover, transition to forward flight, and vertical landing. Design and development Bell constructed the X-14 as an open-cockpit, all-metal (duralumin) monoplane for the USAF. It was powered by two Armstrong Siddeley Viper turbojet engines equipped with thrust deflectors sited at the aircraft's centre of gravity. The engines are fixed in position; transition from vertical to horizontal flight is achieved with a system of movable vanes that control the direction of engine thrust. Top speed was with a service ceiling of . The X-14 was designed using existing parts from two Beechcraft aircraft: wings, ailerons, and landing gear of a Beech Bonanza and the tailcone and empennage of a Beech T-34 Mentor. Operational history The X-14 first flew on 19 February 1957 as a vertical take ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Defence Science And Technology Organisation
The Defence Science and Technology Group (DSTG) is part of the Australian Department of Defence dedicated to providing science and technology support to safeguard Australia and its national interests. The agency's name was changed from Defence Science and Technology Organisation (DSTO) on 1 July 2015. It is Australia's second largest government-funded science organisation after the CSIRO and its research outcomes have enhanced Defence capability and supported operations for over 100 years. The Chief Defence Scientist leads DSTG. The position is supported by an independent Advisory Board with representatives from defence, industry, academia and the science community. DSTG has an annual budget of approximately $440 million and employs over 2500 staff, predominantly scientists, engineers, IT specialists and technicians. DSTG has establishments in all Australian states and the Australian Capital Territory with representatives in Washington, London and Tokyo. It collaborates ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Melbourne Institute Of Technology
RMIT University, officially the Royal Melbourne Institute of Technology,, section 4(b) is a public research university in Melbourne, Australia. Founded in 1887 by Francis Ormond, RMIT began as a night school offering classes in art, science, and technology, in response to the industrial revolution in Australia. It was a private college for more than a hundred years before merging with the Phillip Institute of Technology to become a public university in 1992. It has an enrolment of around 95,000 higher and vocational education students, making it the largest dual-sector education institution in Australia. With an annual revenue of around A$1.5 billion, it is also one of the wealthiest universities in Australia. It is rated a five star university by Quacquarelli Symonds (QS) and is ranked 15th in the World for art and design subjects in the QS World University Rankings, making it the top art and design university in Australia and Oceania. The main campus of RMIT is situate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lawrence Wackett
Sir Lawrence James Wackett (2 January 1896 – 18 March 1982) is widely regarded as "father of the Australian aircraft industry". He has been described as "one of the towering figures in the history of Australian aviation covering, as he did, virtually all aspects of activities: pilot, designer of airframes and engines, entrepreneur and manager". He was knighted for his services to aviation and was a winner of the Oswald Watt Gold Medal. He was also a keen angler and wrote two books on the subject. Early years, war service and education Wackett was born in Townsville, Queensland, on 2 January 1896. He joined the Australian Army and graduated from the Royal Military College, Duntroon, then with the rank of lieutenant joined No. 1 Squadron of the Australian Flying Corps (AFC) which had formed at Point Cook the day before his 20th birthday. He was one of twelve pilots that went to Egypt with the Squadron to operate in support of the Sinai and Palestine Campaign, embarking on 16 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vortex Ring
A vortex ring, also called a toroidal vortex, is a torus-shaped vortex in a fluid; that is, a region where the fluid mostly spins around an imaginary axis line that forms a closed loop. The dominant flow in a vortex ring is said to be toroidal, more precisely poloidal. Vortex rings are plentiful in turbulent flows of liquids and gases, but are rarely noticed unless the motion of the fluid is revealed by suspended particles—as in the smoke rings which are often produced intentionally or accidentally by smokers. Fiery vortex rings are also a commonly produced trick by fire eaters. Visible vortex rings can also be formed by the firing of certain artillery, in mushroom clouds, and in microbursts. A vortex ring usually tends to move in a direction that is perpendicular to the plane of the ring and such that the inner edge of the ring moves faster forward than the outer edge. Within a stationary body of fluid, a vortex ring can travel for relatively long distance, carrying the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hovercraft
A hovercraft, also known as an air-cushion vehicle or ACV, is an amphibious Craft (vehicle), craft capable of travelling over land, water, mud, ice, and other surfaces. Hovercraft use blowers to produce a large volume of air below the hull, or air cushion, that is slightly above atmospheric pressure. The pressure difference between the higher pressure air below the hull and lower pressure ambient air above it produces lift, which causes the hull to float above the running surface. For stability reasons, the air is typically blown through slots or holes around the outside of a disk- or oval-shaped platform, giving most hovercraft a characteristic rounded-rectangle shape. The first practical design for hovercraft was derived from a British invention in the 1950s. They are now used throughout the world as specialised transports in disaster relief, coastguard, military and survey applications, as well as for sport or passenger service. Very large versions have been used to t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ground Effect (cars)
Ground effect may refer to: * Ground effect (aerodynamics), the increased lift and decreased aerodynamic drag of a wing close to a fixed surface * Ground effect (cars), an effect that creates downforce, primarily in racing cars * Ground effect vehicle, a vehicle which attains level flight near the surface of the Earth due to ground effect * Ground effect train A ground effect train is a conceptualized alternative to a magnetic levitation (maglev) train. In both cases the objective is to prevent the vehicle from making contact with the ground. Whereas a maglev train accomplishes this through the use of ..., an alternative to a magnetic levitation train, using ground effect in aircraft to prevent the vehicle from making contact with the ground {{disambig ca:Efecte terra de:Bodeneffekt el:Αρχή επίδρασης του εδάφους es:Efecto suelo fr:Effet de sol ja:地面効果 lt:Ekrano efektas pl:Efekt przypowierzchniowy pt:Efeito Solo ru:Экранный эф ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coandă Effect
The Coandă effect ( or ) is the tendency of a fluid jet to stay attached to a convex surface. ''Merriam-Webster'' describes it as "the tendency of a jet of fluid emerging from an orifice to follow an adjacent flat or curved surface and to entrain fluid from the surroundings so that a region of lower pressure develops." It is named after Romanian inventor Henri Coandă, who was the first to recognize the practical application of the phenomenon in aircraft design around 1910. It was first documented explicitly in two patents issued in 1936. Discovery An early description of this phenomenon was provided by Thomas Young in a lecture given to The Royal Society in 1800: A hundred years later, Henri Coandă identified an application of the effect during experiments with his Coandă-1910 aircraft, which mounted an unusual engine he designed. The motor-driven turbine pushed hot air rearward, and Coandă noticed that the airflow was attracted to nearby surfaces. In 1934 Coandă obt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gulfstream G650
The Gulfstream G650 is a large business jet produced by Gulfstream Aerospace."Gulfstream Introduces the All-New Gulfstream G650" . Gulfstream, March 13, 2008. The model is designated ''Gulfstream GVI'' in its , and may be configured to carry from 11 to 18 passengers. Gulfstream began the G650 program in 2005 and revealed it to the public in 2008. The G650 was formerly the company's largest and fastest business jet with a top speed of Mach 0.925, having been surpassed by the larger G700. The aircraft project was named the 2014 winner of the [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
De Havilland Comet
The de Havilland DH.106 Comet was the world's first commercial jet airliner. Developed and manufactured by de Havilland in the United Kingdom, the Comet 1 prototype first flew in 1949. It featured an aerodynamically clean design with four de Havilland Ghost turbojet engines buried in the wing roots, a pressurised cabin, and large square windows. For the era, it offered a relatively quiet, comfortable passenger cabin and was commercially promising at its debut in 1952. Within a year of entering airline service, problems started to emerge, three Comets being lost within twelve months in highly publicised accidents, after suffering catastrophic in-flight break-ups. Two of these were found to be caused by structural failure resulting from metal fatigue in the airframe, a phenomenon not fully understood at the time; the other was due to overstressing of the airframe during flight through severe weather. The Comet was withdrawn from service and extensively tested. Design and cons ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lockheed Martin F-35 Lightning II
The Lockheed Martin F-35 Lightning II is an American family of single-seat, single-engine, all-weather stealth multirole combat aircraft that is intended to perform both air superiority and strike missions. It is also able to provide electronic warfare and intelligence, surveillance, and reconnaissance capabilities. Lockheed Martin is the prime F-35 contractor, with principal partners Northrop Grumman and BAE Systems. The aircraft has three main variants: the conventional takeoff and landing (CTOL) F-35A, the short take-off and vertical-landing (STOVL) F-35B, and the carrier-based (CV/ CATOBAR) F-35C. The aircraft descends from the Lockheed Martin X-35, which in 2001 beat the Boeing X-32 to win the Joint Strike Fighter (JSF) program. Its development is principally funded by the United States, with additional funding from program partner countries from NATO and close U.S. allies, including the United Kingdom, Australia, Canada, Italy, Norway, Denmark, the Netherland ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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