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Aviation includes the activities surrounding mechanical flight and the aircraft industry. Aircraft includes fixed-wing and rotary-wing types, morphable wings, wing-less lifting bodies, as well as lighter-than-air craft such as hot air balloons and airships.
Aviation began in the 18th century with the development of the hot air balloon, an apparatus capable of atmospheric displacement through buoyancy. Some of the most significant advancements in aviation technology came with the controlled gliding flying of Otto Lilienthal in 1896; then a large step in significance came with the construction of the first powered airplane by the Wright brothers in the early 1900s. Since that time, aviation has been technologically revolutionized by the introduction of the jet which permitted a major form of transport throughout the world. (Full article...)
Wind shear itself is a microscale meteorological phenomenon occurring over a very small distance, but it can be associated with mesoscale or synoptic scale weather features such as squall lines and cold fronts. It is commonly observed near microbursts and downbursts caused by thunderstorms, weather fronts, areas of locally higher low level winds referred to as low level jets, near mountains, radiation inversions that occur due to clear skies and calm winds, buildings, wind turbines, and sailboats. Wind shear has a significant effect during take-off and landing of aircraft due to their effects on steering of the aircraft, and was a significant cause of aircraft accidents involving large loss of life within the United States.
Sound movement through the atmosphere is affected by wind shear, which can bend the wave front, causing sounds to be heard where they normally would not, or vice versa. Strong vertical wind shear within the troposphere also inhibits tropical cyclone development, but helps to organize individual thunderstorms into living longer life cycles which can then produce severe weather. The thermal wind concept explains with how differences in wind speed with height are dependent on horizontal temperature differences, and explains the existence of the jet stream. (Full article...)
...that the mysterious objects known as Black Triangles may actually be hybrid airships? ...that Wing Commander Stanley Goble and Flying Officer Ivor McIntyre, piloting a single-engined seaplane (pictured), became the first men to circumnavigate Australia by air in 1924? ... that Jimmy Doolittle commanded a 22 plane demonstration celebrating the opening of Henderson, Kentucky's Audubon Memorial Bridge in 1932?
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Erich Alfred "Bubi" Hartmann (19 April 1922 – 20 September 1993), also nicknamed "The Blond Knight of Germany" by friends and "The Black Devil" by his enemies, was a German fighter pilot and still is the highest scoring fighter ace in the history of aerial combat. He scored 352 aerial victories (of which 345 were won against the Soviet Air Force, and 260 of which were fighters) in 1,404 combat missions and engaging in aerial combat 825 times while serving with the Luftwaffe in World War II. During the course of his career Hartmann was forced to crash land his damaged fighter 14 times. This was due to damage received from parts of enemy aircraft he had just shot down, or mechanical failure. Hartmann was never shot down or forced to land due to enemy fire.[1]
Hartmann, a pre-war glider pilot, joined the Luftwaffe in 1940 and completed his fighter pilot training in 1942. He was posted to Jagdgeschwader 52 (JG 52) on the Eastern front and was fortunate to be placed under the supervision of some of the Luftwaffe's most experienced fighter pilots. Under their guidance Hartmann steadily developed his tactics which would earn him the coveted Knight's Cross of the Iron Cross with Oak Leaves, Swords and Diamonds on 25 August 1944 for claiming 301 aerial victories.
He scored his 352nd and last aerial victory on 8 May 1945. He and the remainder of JG 52 surrendered to United States Army forces and were turned over to the Red Army. Convicted of false "War Crimes" and sentenced to 25 years of hard labour, Hartmann would spend 10 years in various Soviet prison camps and gulags until he was released in 1955. In 1956, Hartmann joined the newly established West German Luftwaffe and became the first Geschwaderkommodore of Jagdgeschwader 71 "Richthofen". Hartmann resigned early from the Bundeswehr in 1970, largely due to his opposition of the F-104 Starfighter deployment in the Bundesluftwaffe and the resulting clashes with his superiors over this issue. Erich Hartmann died in 1993.
The de Havilland Canada DHC-8, popularly the Dash 8, is a series of twin-turboprop airliners designed by de Havilland Canada in the early 1980s. They are now made by Bombardier Aerospace which purchased DHC from Boeing in 1992. Since 1996 the aircraft have been known as the Q Series, for "quiet", due to installation of the Active Noise and Vibration Suppression (ANVS) system designed to reduce cabin noise and vibration levels to near those of jet airliners.
Notable features of the Dash 8 design are the large T-tail intended to keep the tail free of propwash during takeoff, a very high aspect ratio wing, the elongated engine nacelles also holding the rearward-folding landing gear, and the pointed nose profile. First flight was in 1983, and the plane entered service in 1984 with NorOntair. Piedmont Airlines (formerly Henson Airlines) was the US launch customer for the Dash 8 in 1984.
The Dash 8 design had better cruise performance than the earlier Dash 7, was less expensive to operate, and more notably, much less expensive to maintain. The Dash 8 had the lowest costs per passenger mile of any feederliner of the era. The only disadvantage compared to the earlier Dash 7 was somewhat higher noise levels, but only in comparison as the Dash 7 was notable in the industry for extremely low noise due to its four very large and slow-turning propellers.