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René Leduc (1898-1968)
René Henri Leduc (; April 24, 1898 – March 9, 1968) was a French engineer and aircraft manufacturer, renowned for his pioneering work in ramjet propulsion. Leduc's groundbreaking designs, including the Leduc 010, 016, 021, and 022, were instrumental in advancing supersonic aviation technology. After cancellation of French Aviation Ministry's contracts for the Leduc ramjet aircraft projects, in 1958 Leduc's company converted from aeronautics to hydraulics, becoming known as Hydro Leduc and eventually focusing on production of hydraulic pumps for excavators. Early life René Henri Leduc was born on April 24, 1898, in Saint-Germain-lès-Corbeil, Essonne, France. Leduc's early education ended at 14 when he began working as an apprentice mechanic and later as a clerk in a foundry. During World War I, he joined the artillery, fought on the front lines, and graduated as a top-ranking officer from the Fontainebleau cadet training school. After the war, Leduc pursued an engineerin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saint-Germain-lès-Corbeil
Saint-Germain-lès-Corbeil (, literally ''Saint-Germain near Corbeil'') is a commune in the Essonne department in Île-de-France in northern France. Population Inhabitants of Saint-Germain-lès-Corbeil are known as ''Saint-Germinois'' in French. See also *Communes of the Essonne department The following is a list of the 194 communes of the Essonne department of France. The communes cooperate in the following intercommunalities (as of 2025):Official website Mayors of Essonne Association [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wörgl
Wörgl () is a city in the Austrian state of Tyrol, in the Kufstein district. It is from the international border with Bavaria, Germany. Population Transport Wörgl is a railway junction in the line between Innsbruck and Munich, as well as the inner-Austrian line to Salzburg. Its railway station has been designated as a ''Hauptbahnhof'' () since 10 December 2006. European route E641 connects Wörgl with Salzburg. The E45 and E60 routes (Austrian autobahn A12) pass through Wörgl. File:Bahnhof Wörgl alt.jpg, Wörgl railway station in 1900 File:Wörgl Gare 1965.jpg, Wörgl railway station in 1965 History The Wörgl Experiment Wörgl was the site of the "Miracle of Wörgl", beginning on 31 July 1932 during the Great Depression. Beginning with the issuing of "Certified Compensation Bills", a form of local currency commonly known as Stamp Scrip or Freigeld. This was an application of the monetary theories of the economist Silvio Gesell by the town's then-mayor, . The ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1968 Deaths
Events January–February * January 1968, January – The I'm Backing Britain, I'm Backing Britain campaign starts spontaneously. * January 5 – Prague Spring: Alexander Dubček is chosen as leader of the Communist Party of Czechoslovakia. * January 10 – John Gorton is sworn in as 19th Prime Minister of Australia, taking over from John McEwen after being 1968 Liberal Party of Australia leadership election, elected leader of the Liberal Party of Australia, Liberal Party the previous day, following the disappearance of Harold Holt. Gorton becomes the only Australian Senate, Senator to become Prime Minister, though he immediately transfers to the Australian House of Representatives, House of Representatives through the 1968 Higgins by-election in Holt's vacant seat. * January 15 – The 1968 Belice earthquake in Sicily kills 380 and injures around 1,000. * January 21 ** Vietnam War: Battle of Khe Sanh – One of the most publicized and controversial battles of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1898 Births
Events January * January 1 – New York City annexes land from surrounding counties, creating the City of Greater New York as the world's second largest. The city is geographically divided into five boroughs: Manhattan, Brooklyn, Queens, The Bronx and Staten Island. * January 13 – Novelist Émile Zola's open letter to the President of the French Republic on the Dreyfus affair, , is published on the front page of the Paris daily newspaper , accusing the government of wrongfully imprisoning Alfred Dreyfus and of antisemitism. February * February 12 – The automobile belonging to Henry Lindfield of Brighton rolls out of control down a hill in Purley, London, England, and hits a tree; thus he becomes the world's first fatality from an automobile accident on a public highway. * February 15 – Spanish–American War: The explodes and sinks in Havana Harbor, Cuba, for reasons never fully established, killing 266 men. The event precipitates the United States' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Azerailles
Azerailles () is a commune in the Meurthe-et-Moselle department in northeastern France. Population See also *Communes of the Meurthe-et-Moselle department The following is a list of the 591 communes of the Meurthe-et-Moselle department of France. The communes cooperate in the following intercommunalities (as of 2025): References Communes of Meurthe-et-Moselle {{Lunéville-geo-stub ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydraulics
Hydraulics () is a technology and applied science using engineering, chemistry, and other sciences involving the mechanical properties and use of liquids. At a very basic level, hydraulics is the liquid counterpart of pneumatics, which concerns gases. Fluid mechanics provides the theoretical foundation for hydraulics, which focuses on applied engineering using the properties of fluids. In its fluid power applications, hydraulics is used for the generation, control, and transmission of Power (physics), power by the use of pressure, pressurized liquids. Hydraulic topics range through some parts of science and most of engineering modules, and they cover concepts such as pipe Volumetric flow rate, flow, dam design, fluidics, and fluid control circuitry. The principles of hydraulics are in use naturally in the human body within the vascular system and erectile tissue. ''Free surface hydraulics'' is the branch of hydraulics dealing with free surface flow, such as occurring in rivers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydraulic Machinery
Hydraulic machines use liquid fluid power to perform work. Heavy construction vehicles are a common example. In this type of machine, hydraulic fluid is pumped to various hydraulic motors and hydraulic cylinders throughout the machine and becomes pressurized according to the resistance present. The fluid is controlled directly or automatically by control valves and distributed through hoses, tubes, or pipes. Hydraulic systems, like pneumatic systems, are based on Pascal's law which states that any pressure applied to a fluid inside a closed system will transmit that pressure equally everywhere and in all directions. A hydraulic system uses an incompressible liquid as its fluid, rather than a compressible gas. The popularity of hydraulic machinery is due to the large amount of power that can be transferred through small tubes and flexible hoses, the high power density and a wide array of actuators that can make use of this power, and the huge multiplication of forces t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
V-1 Flying Bomb
The V-1 flying bomb ( "Vengeance Weapon 1") was an early cruise missile. Its official Reich Aviation Ministry () name was Fieseler Fi 103 and its suggestive name was (hellhound). It was also known to the Allies as the buzz bomb or doodlebug and (maybug). The V-1 was the first of the (V-weapons) deployed for the terror bombing of London. It was developed at Peenemünde Army Research Center in 1939 by the at the beginning of the Second World War, and during initial development was known by the codename "Cherry Stone". Due to its limited range, the thousands of V-1 missiles launched into England were fired from V-1 flying bomb facilities, launch sites along the French (Pas-de-Calais) and Dutch coasts or by modified Heinkel He 111 aircraft. The Wehrmacht first launched the V-1s against London on 13 June 1944, one week after (and prompted by) Operation Overlord, the Allied landings in France. At times more than one hundred V-1s a day were fired at south-east England, 9,521 in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Germany
Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total population of over 84 million in an area of , making it the most populous member state of the European Union. It borders Denmark to the north, Poland and the Czech Republic to the east, Austria and Switzerland to the south, and France, Luxembourg, Belgium, and the Netherlands to the west. The Capital of Germany, nation's capital and List of cities in Germany by population, most populous city is Berlin and its main financial centre is Frankfurt; the largest urban area is the Ruhr. Settlement in the territory of modern Germany began in the Lower Paleolithic, with various tribes inhabiting it from the Neolithic onward, chiefly the Celts. Various Germanic peoples, Germanic tribes have inhabited the northern parts of modern Germany since classical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pulsejet
file:Pulse Jet Engine.PNG, 300px, Diagram of a valved pulsejet. 1 - Air enters through valve and is mixed with fuel. 2 - The mixture is ignited, expands, closes the valve and exits through the tailpipe, creating thrust.3 - Low pressure in the engine opens the valve and draws in air. A pulsejet engine (or pulse jet) is a type of jet engine in which combustion occurs in Pulse (physics), pulses. A pulsejet engine can be made with few or no moving parts, and is capable of running statically (that is, it does not need to have air forced into its inlet, typically by forward motion). The best known example is the Argus As 109-014 used to propel Nazi Germany's V-1 flying bomb. Pulsejet engines are a lightweight form of jet propulsion, but usually have a poor compression ratio, and hence give a low specific impulse. The two main types of pulsejet engines use resonant combustion and harness the combustion products to form a pulsating exhaust jet that intermittently produces thrust. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Paris
The University of Paris (), known Metonymy, metonymically as the Sorbonne (), was the leading university in Paris, France, from 1150 to 1970, except for 1793–1806 during the French Revolution. Emerging around 1150 as a corporation associated with the cathedral school of Paris, it was considered the List of medieval universities, second-oldest university in Europe.Charles Homer Haskins: ''The Rise of Universities'', Henry Holt and Company, 1923, p. 292. Officially chartered in 1200 by Philip II of France, King Philip II and recognised in 1215 by Pope Innocent III, it was nicknamed after its theological College of Sorbonne, founded by Robert de Sorbon and chartered by King Louis IX around 1257. Highly reputed internationally for its academic performance in the humanities ever since the Middle Ages – particularly in theology and philosophy – it introduced academic standards and traditions that have endured and spread, such as Doctor (title), doctoral degrees and student nations. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Louis Charles Breguet
Louis Charles Breguet (; 2 January 1880 in Paris – 4 May 1955 in Saint-Germain-en-Laye) was a French aircraft designer and builder, one of the early List of aviation pioneers, aviation pioneers. Biography Louis Charles Breguet was the grandson of Louis Clément François Breguet, and great-great-grandson of the famous horologist Abraham-Louis Breguet. In 1902 Louis married Nelly Girardet, the daughter of painter Eugène Girardet. They had seven children together; five survived infancy. In 1903, he graduated from École supérieure d'électricité, which was the top electrical engineering school in France. In 1905, with his brother Jacques, and under the guidance of Charles Richet, he began work on Breguet-Richet Gyroplane, a gyroplane (the forerunner of the helicopter) with flexible wings. On 29 September 1907, at his workshop at La Brayelle Airfield, La Brayelle, it achieved the first ascent of a vertical-flight aircraft with a pilot, albeit only to a height of . It w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
