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Soko J-22
The Soko J-22 Orao ( sr-cyr, text=Oрао, translation=eagle) is a SFR Yugoslavia, Yugoslav twin-engined, Subsonic aircraft, subsonic Attack aircraft, ground-attack and aerial reconnaissance aircraft. It was developed and built in collaboration by SOKO in Yugoslavia and by Avioane Craiova in neighbouring Romania, being known in the latter as the IAR-93 Vultur. The Orao was designed as either a single-seat main attack version or as a combat-capable twin-seat version, the latter being principally intended for advanced flight- and weapons-training duties. It was developed as a joint Yugoslav-Romanian project, known as YuRom, during the 1970s. Early ambitions to produce a supersonic fighter were scuppered by Britain's unwillingness to permit the desired engine to be licensed production, license-produced in Eastern Europe. Further difficulties in fitting an afterburner to the older Armstrong Siddeley Viper, Rolls-Royce Viper also hindered development and the performance of early-bui ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WikiProject Aircraft
A WikiProject, or Wikiproject, is a Wikimedia movement affinity group for contributors with shared goals. WikiProjects are prevalent within the largest wiki, Wikipedia, and exist to varying degrees within sister projects such as Wiktionary, Wikiquote, Wikidata, and Wikisource. They also exist in different languages, and translation of articles is a form of their collaboration. During the COVID-19 pandemic, CBS News noted the role of Wikipedia's WikiProject Medicine in maintaining the accuracy of articles related to the disease. Another WikiProject that has drawn attention is WikiProject Women Scientists, which was profiled by '' Smithsonian'' for its efforts to improve coverage of women scientists which the profile noted had "helped increase the number of female scientists on Wikipedia from around 1,600 to over 5,000". On Wikipedia Some Wikipedia WikiProjects are substantial enough to engage in cooperative activities with outside organizations relevant to the field at issue. For e ... [...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] |
Soko J-21 Jastreb
The Soko J-21 ''Jastreb'' ( en, Hawk), referred to as the J-1 ''Jastreb'' in some sources, is a Yugoslav single-seat, single-engine, light attack aircraft, designed by the Aeronautical Technical Institute (ATI) and Vojnotehnički Institut Beograd (VTI), in Belgrade and manufactured by SOKO in Mostar. Derived from the G-2 Galeb advanced jet trainer and light attack aircraft, it was designed in single-seat ground-attack and two-seat advanced flying / weapon training versions. Design and development The J-21 Jastreb was developed as a replacement for the Republic F-84 Thunderjet, which had been the most commonly used turbojet fighter-bomber aircraft of the Yugoslav Air Force until 1967. On the basis of the G-2 Galeb, the J-21 Jastreb was developed as a single seat ground attack variant, flying for the first time on 19 July 1965. Pilots sit on licence-built Folland Type 1-B ejection seats under individual canopies hinged on the starboard side in un-pressurised cockpits. Instruments ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soviet Union
The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen national republics; in practice, both its government and its economy were highly centralized until its final years. It was a one-party state governed by the Communist Party of the Soviet Union, with the city of Moscow serving as its capital as well as that of its largest and most populous republic: the Russian SFSR. Other major cities included Leningrad (Russian SFSR), Kiev (Ukrainian SSR), Minsk ( Byelorussian SSR), Tashkent (Uzbek SSR), Alma-Ata (Kazakh SSR), and Novosibirsk (Russian SFSR). It was the largest country in the world, covering over and spanning eleven time zones. The country's roots lay in the October Revolution of 1917, when the Bolsheviks, under the leadership of Vladimir Lenin, overthrew the Russian Provisional Government ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nicolae Ceaușescu
Nicolae Ceaușescu ( , ; – 25 December 1989) was a Romanian communist politician and dictator. He was the general secretary of the Romanian Communist Party from 1965 to 1989, and the second and last Communist leader of Romania. He was also the country's head of state from 1967, serving as President of the State Council and from 1974 concurrently as President of the Republic, until his overthrow and execution in the Romanian Revolution in December 1989, part of a series of anti-Communist uprisings in Eastern Europe that year. Born in 1918 in Scornicești, Ceaușescu was a member of the Romanian Communist youth movement. Ceaușescu rose up through the ranks of Gheorghe Gheorghiu-Dej's Socialist government and, upon Gheorghiu-Dej's death in 1965, he succeeded to the leadership of the Romanian Communist Party as general secretary. Upon his rise to power, he eased press censorship and openly condemned the Warsaw Pact invasion of Czechoslovakia in his speech on 21 August ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Josip Broz Tito
Josip Broz ( sh-Cyrl, Јосип Броз, ; 7 May 1892 – 4 May 1980), commonly known as Tito (; sh-Cyrl, Тито, links=no, ), was a Yugoslav communist revolutionary and statesman, serving in various positions from 1943 until his death in 1980. During World War II, he was the leader of the Yugoslav Partisans, often regarded as the most effective resistance movement in German-occupied Europe. He also served as the president of the Socialist Federal Republic of Yugoslavia from 14 January 1953 until his death on 4 May 1980. He was born to a Croat father and Slovene mother in the village of Kumrovec, Austria-Hungary (now in Croatia). Drafted into military service, he distinguished himself, becoming the youngest sergeant major in the Austro-Hungarian Army of that time. After being seriously wounded and captured by the Russians during World War I, he was sent to a work camp in the Ural Mountains. He participated in some events of the Russian Revolution in 1917 and the subs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Head Of State
A head of state (or chief of state) is the public persona who officially embodies a state Foakes, pp. 110–11 " he head of statebeing an embodiment of the State itself or representatitve of its international persona." in its unity and legitimacy. Depending on the country's form of government and separation of powers, the head of state may be a ceremonial figurehead or concurrently the head of government and more (such as the president of the United States, who is also commander-in-chief of the United States Armed Forces). In a parliamentary system, such as the United Kingdom or India, the head of state usually has mostly ceremonial powers, with a separate head of government. However, in some parliamentary systems, like South Africa, there is an executive president that is both head of state and head of government. Likewise, in some parliamentary systems the head of state is not the head of government, but still has significant powers, for example Morocco. In contrast, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Research And Development
Research and development (R&D or R+D), known in Europe as research and technological development (RTD), is the set of innovative activities undertaken by corporations or governments in developing new services or products, and improving existing ones. Research and development constitutes the first stage of development of a potential new service or the production process. R&D activities differ from institution to institution, with two primary models of an R&D department either staffed by engineers and tasked with directly developing new products, or staffed with industrial scientists and tasked with applied research in scientific or technological fields, which may facilitate future product development. R&D differs from the vast majority of corporate activities in that it is not intended to yield immediate profit, and generally carries greater risk and an uncertain return on investment. However R&D is crucial for acquiring larger shares of the market through the marketisation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yugoslavia
Yugoslavia (; sh-Latn-Cyrl, separator=" / ", Jugoslavija, Југославија ; sl, Jugoslavija ; mk, Југославија ;; rup, Iugoslavia; hu, Jugoszlávia; rue, label=Pannonian Rusyn, Югославия, translit=Juhoslavija; sk, Juhoslávia; ro, Iugoslavia; cs, Jugoslávie; it, Iugoslavia; tr, Yugoslavya; bg, Югославия, Yugoslaviya ) was a country in Southeast Europe and Central Europe for most of the 20th century. It came into existence after World War I in 1918 under the name of the ''Kingdom of Serbs, Croats and Slovenes'' by the merger of the provisional State of Slovenes, Croats and Serbs (which was formed from territories of the former Austria-Hungary) with the Kingdom of Serbia, and constituted the first union of the South Slavic people as a sovereign state, following centuries in which the region had been part of the Ottoman Empire and Austria-Hungary. Peter I of Serbia was its first sovereign. The kingdom gained international recog ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Serbian Air Force And Air Defence
The Serbian Air Force and Air Defence ( sr-Cyrl, Ратно ваздухопловство и противваздухопловна одбрана Војске Србије, Ratno vazduhoplovstvo i protivvazduhoplovna odbrana Vojske Srbije, War Aviation and Anti-Air Defence of the Serbian Armed Forces), is the air force of Serbia and service branch of the Serbian Armed Forces. Its mission is to guard and protect the sovereignty of Serbian airspace, and jointly with the Serbian Army, to protect territorial integrity of the country. Serbian Air Force was established in 1912, thus making Serbia one of the first fifteen states in the world to have an air force. It was subsequently absorbed into the air forces of various Yugoslav states between 1918 and 2006. History The idea to form air forces in the Royal Serbian Army was first mentioned in the General Army Formation Act from 2 August 1893. This act envisioned that within each division of the Army be formed one air force ballo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yugoslav Wars
The Yugoslav Wars were a series of separate but related#Naimark, Naimark (2003), p. xvii. ethnic conflicts, wars of independence, and Insurgency, insurgencies that took place in the Socialist Federal Republic of Yugoslavia, SFR Yugoslavia from 1991 to 2001. The conflicts both led up to and resulted from the breakup of Yugoslavia, which began in mid-1991, into six independent countries matching the six entities known as republics which previously composed Yugoslavia: Slovenia, Croatia, Bosnia and Herzegovina, Montenegro, Serbia, and North Macedonia (previously named ''Macedonia''). Yugoslavia's constituent republics declared independence due to unresolved tensions between ethnic minorities in the new countries, which fuelled the wars. While most of the conflicts ended through peace accords that involved full international recognition of new states, they resulted in a massive number of deaths as well as severe economic damage to the region. During the initial stages of the breaku ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mach Number
Mach number (M or Ma) (; ) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound. It is named after the Moravian physicist and philosopher Ernst Mach. : \mathrm = \frac, where: : is the local Mach number, : is the local flow velocity with respect to the boundaries (either internal, such as an object immersed in the flow, or external, like a channel), and : is the speed of sound in the medium, which in air varies with the square root of the thermodynamic temperature. By definition, at Mach1, the local flow velocity is equal to the speed of sound. At Mach0.65, is 65% of the speed of sound (subsonic), and, at Mach1.35, is 35% faster than the speed of sound (supersonic). Pilots of high-altitude aerospace vehicles use flight Mach number to express a vehicle's true airspeed, but the flow field around a vehicle varies in three dimensions, with corresponding variations in local Mach number. The local spe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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