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Dynamic Soaring
Dynamic soaring is a flying technique used to gain energy by repeatedly crossing the boundary between air masses of different velocity. Such zones of wind gradient are generally found close to obstacles and close to the surface, so the technique is mainly of use to birds and operators of radio-controlled gliders, but glider pilots are sometimes able to soar dynamically in meteorological wind shears at higher altitudes. Dynamic soaring is sometimes confused with slope soaring which is a technique for achieving elevation. Basic mechanism While different flight patterns can be employed in dynamic soaring, the simplest is a closed loop across the shear layer between two airmasses in relative movement, e.g. stationary air in a valley, and a layer of wind above the valley. The gain in speed can be explained in terms of airspeed and groundspeed: * As the glider begins the loop, say in a stationary airmass, groundspeed and airspeed are the same. * The glider enters the moving airmass ne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Energy
In physics, energy (from Ancient Greek: ἐνέργεια, ''enérgeia'', “activity”) is the quantitative property that is transferred to a body or to a physical system, recognizable in the performance of work and in the form of heat and light. Energy is a conserved quantity—the law of conservation of energy states that energy can be converted in form, but not created or destroyed. The unit of measurement for energy in the International System of Units (SI) is the joule (J). Common forms of energy include the kinetic energy of a moving object, the potential energy stored by an object (for instance due to its position in a field), the elastic energy stored in a solid object, chemical energy associated with chemical reactions, the radiant energy carried by electromagnetic radiation, and the internal energy contained within a thermodynamic system. All living organisms constantly take in and release energy. Due to mass–energy equivalence, any object that has mass whe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lord Rayleigh
John William Strutt, 3rd Baron Rayleigh, (; 12 November 1842 – 30 June 1919) was an English mathematician and physicist who made extensive contributions to science. He spent all of his academic career at the University of Cambridge. Among many honors, he received the 1904 Nobel Prize in Physics "for his investigations of the densities of the most important gases and for his discovery of argon in connection with these studies." He served as president of the Royal Society from 1905 to 1908 and as chancellor of the University of Cambridge from 1908 to 1919. Rayleigh provided the first theoretical treatment of the elastic scattering of light by particles much smaller than the light's wavelength, a phenomenon now known as "Rayleigh scattering", which notably explains why the sky is blue. He studied and described transverse surface waves in solids, now known as "Rayleigh waves". He contributed extensively to fluid dynamics, with concepts such as the Rayleigh number (a dimensio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PIK-20 Tiu
The PIK-20 sailplane was designed at the Helsinki University of Technology by Pekka Tammi, with advice from Ilkka Rantasalo and Raimo Nurminen. The prototype first flew on 10 October 1973. It was produced initially by Molino Oy who were taken over by Eiri-Avion Oy (currently Eirikuva Oy) between 1974 and 1980. Later, production was taken over by the French company, Siren SA, under the name Siren PIK-20. At first the PIK-20 was classified as a Standard Class glider, which at the time allowed either flaps or air-brakes for landing approach control. The specification of the Standard Class required the air-brakes or flaps to be capable of keeping the speed below the maximum speed in a vertical dive. However at high speed great force was needed to fully lower the flaps and so the PIK-20 was equipped with a geared crank handle. The first prototype finished 13th in the World Gliding Championships in Waikerie in January 1974 but it performed impressively. (The low placing was caused ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
G-force
The gravitational force equivalent, or, more commonly, g-force, is a measurement of the type of force per unit mass – typically acceleration – that causes a perception of weight, with a g-force of 1 g (not gram in mass measurement) equal to the conventional value of gravitational acceleration on Earth, ''g'', of about . Since g-forces indirectly produce weight, any g-force can be described as a "weight per unit mass" (see the synonym specific weight). When the g-force is produced by the surface of one object being pushed by the surface of another object, the reaction force to this push produces an equal and opposite weight for every unit of each object's mass. The types of forces involved are transmitted through objects by interior mechanical stresses. Gravitational acceleration (except certain electromagnetic force influences) is the cause of an object's acceleration in relation to free fall. The g-force experienced by an object is due to the vector sum of all ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Knot (unit)
The knot () is a unit of speed equal to one nautical mile per hour, exactly (approximately or ). The ISO standard symbol for the knot is kn. The same symbol is preferred by the Institute of Electrical and Electronics Engineers (IEEE), while kt is also common, especially in aviation, where it is the form recommended by the International Civil Aviation Organization (ICAO). The knot is a non- SI unit. The knot is used in meteorology, and in maritime and air navigation. A vessel travelling at 1 knot along a meridian travels approximately one minute of geographic latitude in one hour. Definitions ;1 international knot = :1 nautical mile per hour (by definition), : (exactly), : (approximately), : (approximately), : (approximately) : (approximately). The length of the internationally agreed nautical mile is . The US adopted the international definition in 1954, having previously used the US nautical mile (). The UK adopted the international nautical mile definition in 1970, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Temperature Inversion
In meteorology, an inversion is a deviation from the normal change of an atmospheric property with altitude. It almost always refers to an inversion of the air temperature lapse rate, in which case it is called a temperature inversion. Normally, air temperature decreases with an increase in altitude, but during an inversion warmer air is held above cooler air. An inversion traps air pollution, such as smog, close to the ground. An inversion can also suppress convection by acting as a "cap". If this cap is broken for any of several reasons, convection of any moisture present can then erupt into violent thunderstorms. Temperature inversion can notoriously result in freezing rain in cold climates. Normal atmospheric conditions Usually, within the lower atmosphere (the troposphere) the air near the surface of the Earth is warmer than the air above it, largely because the atmosphere is heated from below as solar radiation warms the Earth's surface, which in turn then warms the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tocumwal
Tocumwal ( ) is a town in the southern Riverina region of New South Wales, Australia, in the Berrigan Shire local government area, near the Victorian border. The town is situated on the banks of the Murray River, north of the city of Melbourne. The Newell Highway and Murray Valley Highway join at the Murray River, and form part of the main road route National Highway A39 between Brisbane and Melbourne. At the , Tocumwal had a population of 2,682. The winner of several 'Tidy Town' awards, Tocumwal is affectionately known as 'The Jewel in the Crown That Is The Riverina District'. The town is said to be named for the local Aboriginal word for "deep hole in the river". History Prior to European settlement, the Tocumwal area was inhabited by the Ulupna and Bangerang Aborigines. The first pastoral runs were established in the 1840s. The town was established in the early 1860s and gazetted in 1862 as "a Village to be called TOCUMWAL ... Situated on the Murray River, on the road from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glider Aircraft
A glider is a fixed-wing aircraft that is supported in flight by the dynamic reaction of the air against its lifting surfaces, and whose free flight does not depend on an engine. Most gliders do not have an engine, although motor-gliders have small engines for extending their flight when necessary by sustaining the altitude (normally a sailplane relies on rising air to maintain altitude) with some being powerful enough to take off by self-launch. There are a wide variety of types differing in the construction of their wings, aerodynamic efficiency, location of the pilot, controls and intended purpose. Most exploit meteorological phenomena to maintain or gain height. Gliders are principally used for the air sports of gliding, hang gliding and paragliding. However some spacecraft have been designed to descend as gliders and in the past military gliders have been used in warfare. Some simple and familiar types of glider are toys such as paper planes and balsa wood gliders. Etym ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glasflügel H-301
The Glasflügel H-301 Libelle is an early composite single-seat sailplane produced by Glasflügel from 1964 to 1969. The H-301 had camber-changing wing flaps so was required to compete in the Open Class because the Standard Class excluded wing flaps. It was often known as the ''Open Class Libelle''. Development In 1964 the H-301 Libelle ("Dragonfly") received the first German and first U.S. Type Certificate issued to an all-fiberglass aircraft. It had flaps, water ballast and retractable landing gear. There are two canopy variants: the normal canopy and a sleeker, lower-profiled 'racing' canopy with no side vent. The canopy is unique in that it has a catch that enables the front to be raised by 25 mm (1 in) in flight to provide a flow of ventilating air instead of the more conventional small sliding panel used for this purpose. The American Wil Schuemann pioneered several performance-enhancing modifications to the type, including a re-profiled wing, converting th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ingo Renner
Ingo Renner OAM (1 June 1940 – 26 February 2022) was an Australian glider pilot. He won the World Gliding Championships four times.Flugplatz Oerlinghausen / Neue Westfälische (in German) – Retrieved 2008-01-11 '''', 27 June 1998. Retrieved 24 January 2008. "Resident coach Ingo Renner is four times World Champion." Renner was born in [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helmut Reichmann
Helmut Reichmann (1941 – March 10, 1992) was a German glider pilot, thrice World Gliding Champion, and co-founder, along with millionaire Barron Hilton, of the Barron Hilton Cup. He was an arts teacher and a professor of industrial design in his native Saarbrücken, in Germany. Born in Wilhelmshaven, Reichmann was raised in Saarbrücken, where he eventually taught at the Institute for Sport Science. Reichmann earned his PhD at the University of Karlsruhe, with a thesis "On the Problem of Airspeed Optimization in Cross-Country Soaring Flight." Reichmann started soaring in 1958 and soon achieved prominence as one of the most successful and influential people in the history of gliding: *1965 German Junior Champion *1968, 1971 and 1973 German National Champion *1970 and 1974 World Champion in the Standard Class *1978 World Champion in the 15-Metre Class *1978 FAI Lilienthal Gliding Medal, the highest honor in soaring *1973 to 1992, German National Team Coach. Reichmann re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soaring Society Of America
The Soaring Society of America (SSA) was founded at the instigation of Warren E. Eaton to promote the sport of soaring in the USA and internationally. The first meeting was held in New York City in the McGraw–Hill Building on February 20, 1932. Its first objective was to hold a national soaring competition every year, but other roles were quickly adopted. In 1954, the Society created the Soaring Hall of Fame. Today the SSA, with a nationwide membership of over 10,000, is headquartered in Hobbs, New Mexico. It is a 501(c)(3) charity organization. The SSA is led by the 17 members on its board of directors and its executive committee, ten of whom are regionally elected by the general membership and serve for three years. The other seven at-large directors are elected annually by the other directors. In addition to the executive meetings of the board, full SSA Board meetings are held twice a year and are open to the general membership. A support staff administers the daily busin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
