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Miroslav Nenadović
Miroslav Nenadović ( sr-Cyrl, Мирослав Ненадовић; 18 March 1904 – 21 February 1989) was an engineer and professor at the Faculty of Mechanical Engineering in Belgrade, a Yugoslav aerospace engineer, who gave immense contribution to the development of the faculty of Mechanical Engineering in Belgrade and the Yugoslav Air Force in general. In 1958 he was elected an associate fellow of the Serbian Academy of Sciences and Arts (SASA), while in 1965 he was elected full member of the Academy. Life He was born on 18 March 1904 in Belgrade (Serbia), where he completed both elementary school and high school. He studied Mathematical Sciences at the University of Belgrade, graduating in 1926. Upon his graduation, he continued his studies in mathematics at the Department for Mechanical and Electrical Engineering at the Faculty of Technical Engineering in Belgrade, graduating in 1932. Career After graduating from the Faculty of Engineering, the French government granted ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Belgrade
Belgrade is the Capital city, capital and List of cities in Serbia, largest city of Serbia. It is located at the confluence of the Sava and Danube rivers and at the crossroads of the Pannonian Basin, Pannonian Plain and the Balkan Peninsula. The population of the Belgrade metropolitan area is 1,685,563 according to the 2022 census. It is one of the Balkans#Urbanization, major cities of Southeast Europe and the List of cities and towns on the river Danube, third-most populous city on the river Danube. Belgrade is one of the List of oldest continuously inhabited cities, oldest continuously inhabited cities in Europe and the world. One of the most important prehistoric cultures of Europe, the Vinča culture, evolved within the Belgrade area in the 6th millennium BC. In antiquity, Thracians, Thraco-Dacians inhabited the region and, after 279 BC, Celts settled the city, naming it ''Singidunum, Singidūn''. It was Roman Serbia, conquered by the Romans under the reign of Augustus and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agricultural Machine
Agricultural machinery relates to the mechanical structures and devices used in farming or other agriculture. There are many types of such equipment, from hand tools and power tools to tractors and the farm implements that they tow or operate. Machinery is used in both organic and nonorganic farming. Especially since the advent of mechanised agriculture, agricultural machinery is an indispensable part of how the world is fed. Agricultural machinery can be regarded as part of wider agricultural automation technologies, which includes the more advanced digital equipment and agricultural robotics. While robots have the potential to automate the three key steps involved in any agricultural operation (diagnosis, decision-making and performing), conventional motorized machinery is used principally to automate only the performing step where diagnosis and decision-making are conducted by humans based on observations and experience. History The Industrial Revolution With the coming o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1989 Deaths
1989 was a turning point in political history with the " Revolutions of 1989" which ended communism in Eastern Bloc of Europe, starting in Poland and Hungary, with experiments in power-sharing coming to a head with the opening of the Berlin Wall in November, the Velvet Revolution in Czechoslovakia and the overthrow of the communist dictatorship in Romania in December; the movement ended in December 1991 with the dissolution of the Soviet Union. Revolutions against communist governments in Eastern Europe mainly succeeded, but the year also saw the suppression by the Chinese government of the 1989 Tiananmen Square protests in Beijing. It was the year of the first Brazilian direct presidential election in 29 years, since the end of the military government in 1985 that ruled the country for more than twenty years, and marked the redemocratization process's final point. F. W. de Klerk was elected as State President of South Africa, and his regime gradually dismantled th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1904 Births
Events January * January 7 – The distress signal ''CQD'' is established, only to be replaced 2 years later by ''SOS''. * January 8 – The Blackstone Library is dedicated, marking the beginning of the Chicago Public Library system. * January 12 – The Herero Wars in German South West Africa begin. * January 17 – Anton Chekhov's last play, ''The Cherry Orchard'' («Вишнëвый сад», ''Vishnevyi sad''), opens at the Moscow Art Theatre directed by Constantin Stanislavski, 6 month's before the author's death. * January 23 – The Ålesund fire destroys most buildings in the town of Ålesund, Norway, leaving about 10,000 people without shelter. * January 25 – Halford Mackinder presents a paper on "The Geographical Pivot of History" to the Royal Geographical Society of London in which he formulates the Heartland Theory, originating the study of geopolitics. February * February 7 – The Great Baltimore Fire in Baltimore, Maryland, destroys over 1,500 build ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wind Tunnel
A wind tunnel is "an apparatus for producing a controlled stream of air for conducting aerodynamic experiments". The experiment is conducted in the test section of the wind tunnel and a complete tunnel configuration includes air ducting to and from the test section and a device for keeping the air in motion, such as a fan. Wind tunnel uses include assessing the effects of air on an aircraft in flight or a ground vehicle moving on land, and measuring the effect of wind on Building, buildings and bridges. Wind tunnel test sections range in size from less than a foot across, to over , and with air speeds from a light breeze to hypersonic. The earliest wind tunnels were invented towards the end of the 19th century, in the early days of aeronautical research, as part of the effort to develop heavier-than-air flying machines. The wind tunnel reversed the usual situation. Instead of the air standing still and an aircraft moving, an object would be held still and the air moved around it. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Council Of The Aeronautical Sciences
The International Council of the Aeronautical Sciences (ICAS) is a worldwide institution, established as an international forum for individual national Aeronautics, aeronautical professional associations. History It was formed on 29 January 1957 at a conference in the US. The first ICAS Congress was held in Spain in 1958. Frank Wattendorf, of AGARD, was the first Director. A second meeting was held in Paris, with Hugh Latimer Dryden of the National Advisory Committee for Aeronautics, and representatives from ONERA (Office National d'Etudes et de Recherches Aérospatiales), the Royal Aeronautical Society (RAeS), the WGL (now the Deutsche Gesellschaft für Luft- und Raumfahrt), the Association Française des Ingénieurs et Techniciens de l'Aéronautique (now the Association Aéronautique et Astronautique de France), and the National Aeronautical Research Institute, Aeronautical Research Institute of Sweden. Congress It holds a biennial international congress in September. In 1986 i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monoplane
A monoplane is a fixed-wing aircraft configuration with a single mainplane, in contrast to a biplane or other types of multiplanes, which have multiple wings. A monoplane has inherently the highest efficiency and lowest drag of any wing configuration and is the simplest to build. However, during the early years of flight, these advantages were offset by its greater weight and lower manoeuvrability, making it relatively rare until the 1930s. Since then, the monoplane has been the most common form for a fixed-wing aircraft. Characteristics Support and weight The inherent efficiency of the monoplane is best achieved in the cantilever wing, which carries all structural forces internally. However, to fly at practical speeds the wing must be made thin, which requires a heavy structure to make it strong and stiff enough. External bracing can be used to improve structural efficiency, reducing weight and cost. For a wing of a given size, the weight reduction allows it to fly slowe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rogožarski Brucoš
Rogožarski Brucoš (Serbian Cyrillic:Рогожарски Бруцош) was a single-engine, two-seat, low wing monoplane aircraft designed as a trainer in Yugoslavia before World War II. It was designed and built in the Rogožarski aircraft factory in Belgrade. Design and development In order to replace its obsolete pilot training aircraft, the Zmaj Fizir FN biplane, the Yugoslav Royal Air Force (YRAF) Command held a competition in mid-1936 to develop a new aircraft for training pilots. The new aircraft was to be a low wing aircraft so that Yugoslavian pilots could get accustomed to piloting the fighters that the Yugoslav Royal Air Force was using, the Hawker Hurricane, Messerschmitt Bf 109 and the Rogožarski IK-3. The Rogožarski Factory decided to participate in the competition and engaged two well-known aerospace engineers, Miroslav Nenadović and Mitrović Milenko-Spirta, who began working on the design. Building of the prototype started the same year, and it flew for t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Air-taxi
An air taxi is a small commercial aircraft that makes short flights on demand. History The concept of air taxis existed as early as the 1910s. This concept goes back as early as 1917 with Glenn Curtiss’ prototype, the auto-plane. Furthermore, during the 1920s to the late 1950s, various inventors created their own prototypes. Such inventors included Henry Ford, Waldo Waterman, and Moulton “Molt” Taylor. However, each of these projects faced challenges which included crashes, lack of funding, or technical difficulties. After all this experimentation and challenges faced, the urban air mobility industry had shifted focus on “improving safety and enhancing economic and operational efficiency of vertical flight". The next phase from the 1950s to the late 1980s included urban air mobility services through the use of helicopters within major cities such as Los Angeles, San Francisco, and New York; however, the challenges of fuel costs and safety have made it difficult to comm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biplane
A biplane is a fixed-wing aircraft with two main wings stacked one above the other. The first powered, controlled aeroplane to fly, the Wright Flyer, used a biplane wing arrangement, as did many aircraft in the early years of aviation. While a biplane wing structure has a structural advantage over a monoplane, it produces more drag than a monoplane wing. Improved structural techniques, better materials and higher speeds made the biplane configuration obsolete for most purposes by the late 1930s. Biplanes offer several advantages over conventional cantilever monoplane designs: they permit lighter wing structures, low wing loading and smaller span for a given wing area. However, interference between the airflow over each wing increases drag substantially, and biplanes generally need extensive bracing, which causes additional drag. Biplanes are distinguished from tandem wing arrangements, where the wings are placed forward and aft, instead of above and below. The term is als ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rudolf Fizir
Rudolf Fizir (13 January 1891 – 11 November 1960) was an airplane constructor. He designed at least 18 original planes, some conversions of landplanes to seaplanes - and a parachute. Fizir was born in Ludbreg, a small town on the river Bednja, in the north of Croatia. In 1914, whilst still a senior student, he was offered his first job in Schwerin, where he worked in the construction of fighter aircraft for the German '' Fliegerkorps'' in the new ''Fokker-Flugzeugbau'' factory. From there he was sent to Budapest, in order to find and organize a Fokker subsidiary. Between 1918 and 1920, Fizir was employed in the automobile industry, where he gathered experience with internal combustion engines. In 1920 he returned to Ludbreg, and then moved to Petrovaradin. There he started to build his aircraft designs in his yard, at his own expense. With a biplane, which Fizir built in 1925, he won the first prize in the 1927 Little Entente contest, despite having an engine with only half the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hansa-Brandenburg C
Hansa und Brandenburgische Flugzeugwerke (more usually just Hansa-Brandenburg) was a German aircraft manufacturing company that operated during World War I. It was created in May 1914 by the purchase of ''Brandenburgische Flugzeugwerke'' by Camillo Castiglioni, who relocated the factory from Liebau to Brandenburg an der Havel. Brandenburg's chief designer, Ernst Heinkel was retained by the new enterprise. By Autumn 1915, it had become the largest aircraft manufacturer in Germany, with a capital of 1,500,000 Marks, 1,000 employees, and two more factories - one in Rummelsburg, Berlin, and one in Wandsbek, Hamburg. Although manufacturing was carried out in Germany, Castiglioni was an Austrian, and many of the firm's military aircraft were produced for the Austro-Hungarian aviation corps. The firm became especially known for a highly successful series of floatplane fighters and reconnaissance aircraft that were used by the Imperial German Navy during the war. Hansa-Brandenburg did ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
