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Opel RAK.1
The Opel RAK.1 (also known as the Opel RAK.3) was the world's first purpose-built rocket-powered aircraft. It was designed and built by Julius Hatry under commission from Fritz von Opel, who flew it on September 30, 1929 in front of a large crowd at Rebstock airport near Frankfurt am Main. The RAK.1 plane was part of a series of rocket-powered vehicles that were developed and demonstrated within the Opel RAK program, the world's first large-scale rocket program. The idea to build and race a rocket-powered car as an intermediate step to realize rocket-powered aviation and even spaceflight was suggested to von Opel by Max Valier. After the World War I, Valier became highly interested in rocketry. Valier, in 1927, he was one of the co-founders of the German ''Verein für Raumschiffahrt'', or “Spaceflight Society,” a group of later highly influential scientists who would play a major role in making rocket spaceflight a reality. As an early spaceflight advocate, Valier was more inte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Opel RAK1 2
Opel Automobile GmbH (), usually shortened to Opel, is a German automobile manufacturer which has been a subsidiary of Stellantis since 16 January 2021. It was owned by the American automaker General Motors from 1929 until 2017 and the PSA Group, a predecessor of Stellantis, from 2017 until 2021. Opel vehicles are sold in the United Kingdom as Vauxhall. Some Opel vehicles were badge-engineered in Australia under the Holden brand until 2020 and in North America and China under the Buick, Saturn, and Cadillac brands. Opel traces its roots to a sewing machine manufacturer founded by Adam Opel in 1862 in Rüsselsheim am Main. The company began manufacturing bicycles in 1886 and produced its first automobile in 1899. With the Opel RAK program, the world's first rocket program, under the leadership of Fritz von Opel, the company played an important role in the history of aviation and spaceflight: Various land speed records were achieved, and the world's first rocket-powered flights we ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RRG Raketen-Ente Deutsches Segelflugmuseum 01 2009-05-31 , a luxury saloon car
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RRG may be: * Reichs-Rundfunk-Gesellschaft, a network of German broadcasting companies * Rhön-Rossitten Gesellschaft, a German gliding organization * Role and Reference Grammar, a model of natural language grammar * Rolls-Royce Ghost The Rolls-Royce Ghost is a full-sized luxury car manufactured by Rolls-Royce Motor Cars. The "Ghost" nameplate, named in honour of the Silver Ghost, a car first produced in 1906, was announced in April 2009 at the Auto Shanghai show. The produ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Great Depression
The Great Depression (19291939) was an economic shock that impacted most countries across the world. It was a period of economic depression that became evident after a major fall in stock prices in the United States. The economic contagion began around September and led to the Wall Street stock market crash of October 24 (Black Thursday). It was the longest, deepest, and most widespread depression of the 20th century. Between 1929 and 1932, worldwide gross domestic product (GDP) fell by an estimated 15%. By comparison, worldwide GDP fell by less than 1% from 2008 to 2009 during the Great Recession. Some economies started to recover by the mid-1930s. However, in many countries, the negative effects of the Great Depression lasted until the beginning of World War II. Devastating effects were seen in both rich and poor countries with falling personal income, prices, tax revenues, and profits. International trade fell by more than 50%, unemployment in the U.S. rose to 23% and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Black Powder
Gunpowder, also commonly known as black powder to distinguish it from modern smokeless powder, is the earliest known chemical explosive. It consists of a mixture of sulfur, carbon (in the form of charcoal) and potassium nitrate (saltpeter). The sulfur and carbon act as fuels while the saltpeter is an oxidizer. Gunpowder has been widely used as a propellant in firearms, artillery, rocketry, and pyrotechnics, including use as a blasting agent for explosives in quarrying, mining, building pipelines and road building. Gunpowder is classified as a low explosive because of its relatively slow decomposition rate and consequently low brisance. Low explosives deflagrate (i.e., burn at subsonic speeds), whereas high explosives detonate, producing a supersonic shockwave. Ignition of gunpowder packed behind a projectile generates enough pressure to force the shot from the muzzle at high speed, but usually not enough force to rupture the gun barrel. It thus makes a good propellant but is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Universal Newsreel
Universal Newsreel (sometimes known as Universal-International Newsreel or just U-I Newsreel) was a series of 7- to 10-minute newsreels that were released twice a week between 1929 and 1967 by Universal Studios. A Universal publicity official, Sam B. Jacobson, was involved in originating and producing the newsreels. Nearly all of them were filmed in black-and-white, and many were narrated by Ed Herlihy. From January 1919 to July 1929, Universal released ''International Newsreel'', produced by Hearst's International News Service—this series later became ''Hearst Metrotone News'' released first by Fox Film Corporation 1929–1934 and then by Metro-Goldwyn-Mayer beginning in 1934. In 1974, the films' owner, MCA, made the decision to donate all its edited newsreels and outtakes collection to the National Archives, without copyright restrictions. The decision effectively released the films into the public domain, although some stories may contain other underlying intellectual pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fox Movietone
Movietone News is a newsreel that ran from 1928 to 1963 in the United States. Under the name British Movietone News, it also ran in the United Kingdom from 1929 to 1986, in France also produced by Fox-Europa, in Australia and New Zealand until 1970, and Germany as Fox Tönende Wochenschau. History Movietone News evolved from an earlier newsreel established by Fox Films called Fox News which was founded in 1919. It produced silent newsreels. When Fox entered talkies in 1928 with '' Mother Knows Best'', the name Fox Movietone was applied to Fox's sound productions. In the U.S. as Fox Movietone News it produced cinema, sound newsreels from 1928 to 1963, and from 1929 to 1986 in the UK (for much of that time as British Movietone News), as well as 1929 to 1975 in Australia. One of the earliest in the series featured ''George Bernard Shaw Talks to Movietone News'', released on June 25, 1928. One of the known early producers of these newsreels was Abraham Harrison also known as Harry, f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The New York Times
''The New York Times'' (''the Times'', ''NYT'', or the Gray Lady) is a daily newspaper based in New York City with a worldwide readership reported in 2020 to comprise a declining 840,000 paid print subscribers, and a growing 6 million paid digital subscribers. It also is a producer of popular podcasts such as '' The Daily''. Founded in 1851 by Henry Jarvis Raymond and George Jones, it was initially published by Raymond, Jones & Company. The ''Times'' has won 132 Pulitzer Prizes, the most of any newspaper, and has long been regarded as a national " newspaper of record". For print it is ranked 18th in the world by circulation and 3rd in the U.S. The paper is owned by the New York Times Company, which is publicly traded. It has been governed by the Sulzberger family since 1896, through a dual-class share structure after its shares became publicly traded. A. G. Sulzberger, the paper's publisher and the company's chairman, is the fifth generation of the family to head the pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Technoseum
The Technoseum (former name State Museum of Technology and Work, German: ''Landesmuseum für Technik und Arbeit'') is a technology museum in Mannheim, Baden-Württemberg, Germany, with displays covering the industrialisation of the south-western regions of the country. The museum building was designed by the Berlin architect Ingeborg Kühler. Its planning and construction period lasted from 1982 to 1990. Permanent exhibitions Visitors who walk through the building from top to bottom will experience a journey in time from the beginning of the industrial revolution in the state of Baden-Württemberg to the present day. Stands portraying the technical, social and political changes since the 18th century include those on clocks, paper manufacture and weaving. There are displays of living and working premises as well as machinery from the fields of industry, transport and the office. These displays enable the visitor to gain a graphic understanding of the far-reaching changes in l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tailplane
A tailplane, also known as a horizontal stabiliser, is a small lifting surface located on the tail (empennage) behind the main lifting surfaces of a fixed-wing aircraft as well as other non-fixed-wing aircraft such as helicopters and gyroplanes. Not all fixed-wing aircraft have tailplanes. Canards, tailless and flying wing aircraft have no separate tailplane, while in V-tail aircraft the vertical stabiliser, rudder, and the tail-plane and elevator are combined to form two diagonal surfaces in a V layout. The function of the tailplane is to provide stability and control. In particular, the tailplane helps adjust for changes in position of the centre of pressure or centre of gravity caused by changes in speed and attitude, fuel consumption, or dropping cargo or payload. Tailplane types The tailplane comprises the tail-mounted fixed horizontal stabiliser and movable elevator. Besides its planform, it is characterised by: *Number of tailplanes - from 0 ( tailless or canard) t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wing
A wing is a type of fin that produces lift while moving through air or some other fluid. Accordingly, wings have streamlined cross-sections that are subject to aerodynamic forces and act as airfoils. A wing's aerodynamic efficiency is expressed as its lift-to-drag ratio. The lift a wing generates at a given speed and angle of attack can be one to two orders of magnitude greater than the total drag on the wing. A high lift-to-drag ratio requires a significantly smaller thrust to propel the wings through the air at sufficient lift. Lifting structures used in water include various foils, such as hydrofoils. Hydrodynamics is the governing science, rather than aerodynamics. Applications of underwater foils occur in hydroplanes, sailboats and submarines. Etymology and usage For many centuries, the word "wing", from the Old Norse ''vængr'', referred mainly to the foremost limbs of birds (in addition to the architectural aisle). But in recent centuries the word's meaning has ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ente
The Ente (german: duck) was the world's first full-sized rocket-powered aircraft. It was designed by Alexander Lippisch as a sailplane and first flown under power on June 11, 1928, piloted by Fritz Stamer as part of the Opel-RAK rocket program led by Fritz von Opel and Max Valier. During the late 1920s von Opel had made a variety of demonstrations involving rocket-powered vehicles for the Opel company. He was assisted by the pyrotechnics manufacturer Friedrich Sander and the rocketry advocate Max Valier. In March 1928 the three men visited the Wasserkuppe, a mountain which had become the center of German gliding to investigate the possibility of fitting rockets to an aircraft. There they encountered some of Lippisch's revolutionary gliders, which because of their tail-less designs seemed suitable for adapting to rocket propulsion. Lippisch was able to demonstrate how models of his aircraft would fly with small rockets installed in them. In June von Opel, Sander, and Valier ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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