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Erik Bratt
Erik Gustaf Bratt (1 January 1916 – 13 February 2010) was a Swedish engineer and pilot. Erik Bratt was the brother of Colonel Lars Bratt. Biography Erik Bratt was responsible for the construction of Saab 35 Draken and Saab 37 Viggen by Saab AB, Linköping Sweden. Bratt personified in Sweden the concept of the development and vast expansion of the Swedish Air Force in the shadow of the cold war and the nuclear arms race. Personal Bratt took flight certificate 1937 and underwent flight training in the Swedish Air Force from 1940 to 1942. He graduated in 1942 with a master's degree in engineering from the Royal Institute of Technology. He was employed at Skandinaviska Aero (later a part of Scandinavian Airlines) from 1942 to 1945 and from 1945 until his retirement in 1981 at Saab AB. In 1962 he became chief engineer, in 1964 became the head of the design department for aircraft and in 1974 director. Saab 35 Draken and Saab 37 Viggen By Saab AB, Bratt was the leader of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Institute Of Technology
The KTH Royal Institute of Technology ( sv, Kungliga Tekniska högskolan, lit=Royal Institute of Technology), abbreviated KTH, is a public research university in Stockholm, Sweden. KTH conducts research and education in engineering and technology and is Sweden's largest technical university. Currently, KTH consists of five schools with four campuses in and around Stockholm. KTH was established in 1827 as the ''Teknologiska institutet (Institute of Technology)'' and had its roots in the ''Mekaniska skolan (School of Mechanics)'' that was established in 1798 in Stockholm. But the origin of KTH dates back to the predecessor of the ''Mekaniska skolan'', the ''Laboratorium mechanicum'', which was established in 1697 by the Swedish scientist and innovator Christopher Polhem. The Laboratorium mechanicum combined education technology, a laboratory, and an exhibition space for innovations. In 1877 KTH received its current name, Kungliga Tekniska högskolan (KTH Royal Institute of Technol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fighter Aircraft
Fighter aircraft are fixed-wing military aircraft designed primarily for air-to-air combat. In military conflict, the role of fighter aircraft is to establish air superiority of the battlespace. Domination of the airspace above a battlefield permits bombers and attack aircraft to engage in tactical and strategic bombing of enemy targets. The key performance features of a fighter include not only its firepower but also its high speed and maneuverability relative to the target aircraft. The success or failure of a combatant's efforts to gain air superiority hinges on several factors including the skill of its pilots, the tactical soundness of its doctrine for deploying its fighters, and the numbers and performance of those fighters. Many modern fighter aircraft also have secondary capabilities such as ground attack and some types, such as fighter-bombers, are designed from the outset for dual roles. Other fighter designs are highly specialized while still filling the ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Supersonic
Supersonic speed is the speed of an object that exceeds the speed of sound ( Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level, this speed is approximately . Speeds greater than five times the speed of sound (Mach 5) are often referred to as hypersonic. Flights during which only some parts of the air surrounding an object, such as the ends of rotor blades, reach supersonic speeds are called transonic. This occurs typically somewhere between Mach 0.8 and Mach 1.2. Sounds are traveling vibrations in the form of pressure waves in an elastic medium. Objects move at supersonic speed when the objects move faster than the speed at which sound propagates through the medium. In gases, sound travels longitudinally at different speeds, mostly depending on the molecular mass and temperature of the gas, and pressure has little effect. Since air temperature and composition varies significantly with altitude, the speed of s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tupolev Tu-16
The Tupolev Tu-16 ( NATO reporting name: Badger) is a twin-engined jet strategic heavy bomber used by the Soviet Union. It has been flown for almost 70 years, and the Chinese license-built Xian H-6 remains in service with the People's Liberation Army Air Force. Development In the late 1940s, the Soviet Union was strongly committed to matching the United States in strategic bombing capability. The Soviets' only long-range bomber at the time was Tupolev's Tu-4 'Bull', a reverse-engineered copy of the American B-29 Superfortress. The development of the notably powerful Mikulin AM-3 turbojet led to the possibility of a large, jet-powered bomber. The Tupolev design bureau began work on the Tu-88 ("Aircraft N") prototypes in 1950. The Tu-88 first flew on 27 April 1952. After winning a competition against the Ilyushin Il-46, it was approved for production in December 1952. The first production bombers entered service with Frontal Aviation in 1954, receiving the service designation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bombers
A bomber is a military combat aircraft designed to attack ground and naval targets by dropping air-to-ground weaponry (such as bombs), launching torpedoes, or deploying air-launched cruise missiles. The first use of bombs dropped from an aircraft occurred in the Italo-Turkish War, with the first major deployments coming in the First World War and Second World War by all major airforces causing devastating damage to cities, towns, and rural areas. The first purpose built bombers were the Italian Caproni Ca 30 and British Bristol T.B.8, both of 1913. Some bombers were decorated with nose art or victory markings. There are two major classifications of bomber: strategic and tactical. Strategic bombing is done by heavy bombers primarily designed for long-range bombing missions against strategic targets to diminish the enemy's ability to wage war by limiting access to resources through crippling infrastructure or reducing industrial output. Tactical bombing is aimed at countering ene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuclear Weapons
A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission (fission bomb) or a combination of fission and fusion reactions (thermonuclear bomb), producing a nuclear explosion. Both bomb types release large quantities of energy from relatively small amounts of matter. The first test of a fission ("atomic") bomb released an amount of energy approximately equal to . The first thermonuclear ("hydrogen") bomb test released energy approximately equal to . Nuclear bombs have had yields between 10 tons TNT (the W54) and 50 megatons for the Tsar Bomba (see TNT equivalent). A thermonuclear weapon weighing as little as can release energy equal to more than . A nuclear device no larger than a conventional bomb can devastate an entire city by blast, fire, and radiation. Since they are weapons of mass destruction, the proliferation of nuclear weapons is a focus of international relations policy. Nuclear weapons have been deployed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Defence Act Of 1958 (Sweden)
The Defence Act of 1958 ( sv, Försvarsbeslutet 1958, FB58) was a defence act passed by the Swedish Riksdag on 4 February 1958. It was made with Prague Coup, Korean War and Hungarian Revolution of 1956 as a background, where the threat of nuclear weapons, adaptability and possible acquisition of a Swedish nuclear weapon also played a role. Background For Swedish Armed Forces, the defence act meant an investment in quality over quantity, which meant a minor reduction of the Swedish Army while there was a strong redistribution of resources from Swedish Navy to Swedish Air Force, where attack aircraft would take over the tasks of the larger ships. At the same time, the defence budget for each year would be upgraded automatically by 2.5 percent. The defence act was a broad political majority agreement. The assessments behind the act were not entirely dominated by defence policy considerations, but were also motivated by factual factors such as socio-economic development and the finan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Delta Wing
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 (Δ). Although long studied, it did not find significant applications until the Jet Age, when it proved suitable for high-speed subsonic and supersonic flight. At the other end of the speed scale, the 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 substantial factor in the success of the Mi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Supersonic Flight
A supersonic aircraft is an aircraft capable of supersonic flight, that is, flying faster than the speed of sound (Mach number 1). Supersonic aircraft were developed in the second half of the twentieth century. Supersonic aircraft have been used for research and military purposes, but only two supersonic aircraft, the Tupolev Tu-144 (first flown on December 31, 1968) and the Concorde (first flown on March 2, 1969), ever entered service for civil use as airliners. Fighter jets are the most common example of supersonic aircraft. The aerodynamics of supersonic flight is called compressible flow because of the compression associated with the shock waves or "sonic boom" created by any object traveling faster than sound. Aircraft flying at speeds above Mach 5 are called hypersonic aircraft. History The first aircraft to fly supersonic in level flight was the American Bell X-1 experimental plane which was powered by a thrust rocket powered by liquid oxygen and ethyl alcohol. Mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Olof Ljungström
Gustaf Olof "Olle" Ljungström (1918-2013) was a Swedish engineer. He was a visiting professor in aircraft design at Stanford University and the California Institute of Technology in the United States. Biography Olof Ljungström was born in 1918 as the son of Fredrik Ljungström and Signe (née Söderberg). He studied at Whitlockska samskolan, and studied aeronautics at the Royal Institute of Technology in Stockholm. He undertook military service as an automotive engineer in the Swedish Air Force in 1939 and 1940. He acquired a Ph.D. in transportation and aviation technology at the Royal Institute of Technology in 1973. Ljungström made contributions as an engineer in both his family businesses, notably in shale oil extraction, and beyond. He was recruited for the aircraft development at Saab. As a technical engineer, he worked with models from Saab 17 and Saab 29 Tunnan to Saab 35 Draken, the latter which was originally due to employ the jet engine STAL Dovern. He also spearhe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hermann Behrbohm
Otto ''Hermann'' Bernhard Behrbohm, born 30 October 1907 in Karlsruhe, Grand Duchy of Baden, Imperial Germany; died 12 October 1977 in Fingelsham, Northbourne, Kent, United Kingdom, was a German mathematician active in Sweden and Germany. He was significant in the mathematics behind the development of the Aerodynamics of the Delta wing concept and the technology of Supersonic flight. Biography Hermann Behrbohm was significant in the design of Saab 35 Draken and Saab 37 Viggen. He made the calculations supporting Alexander Lippisch developing the Delta wing concept at the end of the war. He received the Swedish Aeronautical Society's Thulin Medal 1968 in silver for having promoted aviation technology with work. He made efforts in aviation technology in several countries during his life, due to the circumstances. Finally, as a pensioner, 1972 he moved to England with his British wife. His children stayed in Sweden. He authored many articles in aerodynamic and mathemati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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