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Ellehammer Helicopter
__NOTOC__ The Ellehammer helicopter was an otherwise-unnamed experimental aircraft built in Denmark in 1912. Based on experiments with models, Jacob Ellehammer constructed a full-size machine equipped with two contra-rotating discs, each of which was fitted with six vanes around its circumference. The pitch of these vanes could be varied in operation by the pilot, an early example of cyclic control. The same engine that drove the rotors also powered a propeller mounted tractor-wise to the aircraft's frame. After a number of indoor tests, the aircraft was demonstrated outdoors and made a number of free take-offs. One of these trials was witnessed by Prince Axel of Denmark. Experiments with the helicopter continued until September 1916, when it tipped over during take-off, destroying its rotors. A famous photo shows it hovering in 1914, though there is no evidence that it was successful in achieving translational flight. Ellehammer later studied a disc-rotor configuration - a co ... [...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] |
WikiProject Aircraft/page Content
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] |
Jacob Ellehammer
Jacob Christian Hansen-Ellehammer (14 June 1871 – 20 May 1946) was a Danish watchmaker and inventor born in Bakkebølle, Denmark. He is remembered chiefly for his contributions to powered flight. Following the end of his apprenticeship as a watchmaker, he moved to Copenhagen where he worked as an electronics mechanic before establishing his own company in 1898. In the beginning he produced cigarette machines, beverage machines and other electronic machinery. In 1904 he produced his first motorcycle, the Elleham motorcycle. The Elleham motorcycle is of step-tru type with the engine situated beneath the seating, thus predating the Vespa scooter by 40 years. In 1903–1904 Jacob Hansen-Ellehammer used his experience constructing motorcycles fitted with single-cylinder Peugeot Frères engines to build the world's first air-cooled radial engine, a three-cylinder engine by utilizing Peugeot Frères cylinders and heads in a home-cast engine block. The initial engine soon proved too ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1912 In Aviation
This is a list of aviation-related events from 1912: Events *First successful all-metal aircraft flies, the Tubavion monoplane built by Charles Ponche and Maurice Primard in France. *The French Navy officially establishes an air arm, the '' Service Aéronautique''.Layman 1989, p. 15. *The first Bulgarian Air Force is formed, using Blériot, Albatros, Farman, Nieuport, Voisin, Somer, Skiorski, and Bristol aircraft (23 in total) to fight in the First Balkan War. *Captain Alessandro Guidoni of Italy experiments with the air-launching of torpedoes by dropping weights from a Farman biplane. January–March *10 January **Lieutenant Commander Charles Samson flies Short Improved S.27 No. 38 from a platform constructed over the deck of battleship HMS ''Africa'' moored in the River Medway, England. It is the United Kingdoms first takeoff by an airplane from a ship. **An aircraft drops propaganda leaflets for the first time, when Italian Army Captain Carlo Piazza drops leaflets ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyclic Pitch
A helicopter pilot manipulates the helicopter flight controls to achieve and maintain controlled aerodynamic flight. Changes to the aircraft flight control system transmit mechanically to the rotor, producing aerodynamic effects on the rotor blades that make the helicopter move in a deliberate way. To tilt forward and back (pitch) or sideways (roll) requires that the controls alter the angle of attack of the main rotor blades ''cyclically'' during rotation, creating differing amounts of lift (force) at different points in the cycle. To increase or decrease overall lift requires that the controls alter the angle of attack for all blades ''collectively'' by equal amounts at the same time, resulting in ascent, descent, acceleration and deceleration. A typical helicopter has three flight control inputs—the cyclic stick, the collective lever, and the anti-torque pedals. Depending on the complexity of the helicopter, the cyclic and collective may be linked together by a ''mixing uni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ellehammer 1935
Jacob Christian Hansen-Ellehammer (14 June 1871 – 20 May 1946) was a Danish watchmaker and inventor born in Bakkebølle, Denmark. He is remembered chiefly for his contributions to powered flight. Following the end of his apprenticeship as a watchmaker, he moved to Copenhagen where he worked as an electronics mechanic before establishing his own company in 1898. In the beginning he produced cigarette machines, beverage machines and other electronic machinery. In 1904 he produced his first motorcycle, the Elleham motorcycle. The Elleham motorcycle is of step-tru type with the engine situated beneath the seating, thus predating the Vespa scooter by 40 years. In 1903–1904 Jacob Hansen-Ellehammer used his experience constructing motorcycles fitted with single-cylinder Peugeot Frères engines to build the world's first air-cooled radial engine, a three-cylinder engine by utilizing Peugeot Frères cylinders and heads in a home-cast engine block. The initial engine soon proved too ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prince Axel Of Denmark
Prince Axel of Denmark, (Danish: ''Prins Axel Christian Georg til Danmark''; 12 August 1888 – 14 July 1964) was a member of the Danish royal family. He was the second son of Prince Valdemar of Denmark and Princess Marie of Orléans, and a grandson of King Christian IX of Denmark. On his father's side, he was a first cousin of King Christian X of Denmark, King Haakon VII of Norway and his wife Queen Maud, King Constantine I of Greece, King George V of the United Kingdom, Emperor Nicholas II of Russia, Ernest Augustus III, Duke of Brunswick and Prince Andrew of Greece and Denmark, father of Prince Philip, Duke of Edinburgh, and on his mother's side of Henri, Count of Paris (1908–1999), Orleanist pretender to the French throne. Prince Axel was a popular patron of sports. He was a prominent International Olympic Committee member and activist and also a business executive. In 1963, Prince Axel became the first honorary member of the IOC in history. He was an officer in the Royal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1910s Danish Experimental Aircraft
Year 191 ( CXCI) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Apronianus and Bradua (or, less frequently, year 944 ''Ab urbe condita''). The denomination 191 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Parthia * King Vologases IV of Parthia dies after a 44-year reign, and is succeeded by his son Vologases V. China * A coalition of Chinese warlords from the east of Hangu Pass launches a punitive campaign against the warlord Dong Zhuo, who seized control of the central government in 189, and held the figurehead Emperor Xian hostage. After suffering some defeats against the coalition forces, Dong Zhuo forcefully relocates the imperial capital from Luoyang to Chang'an. Before leaving, Dong Zhuo orders his troops to loot the tombs of the Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ellehammer Aircraft
Jacob Christian Hansen-Ellehammer (14 June 1871 – 20 May 1946) was a Danish watchmaker and inventor born in Bakkebølle, Denmark. He is remembered chiefly for his contributions to powered flight. Following the end of his apprenticeship as a watchmaker, he moved to Copenhagen where he worked as an electronics mechanic before establishing his own company in 1898. In the beginning he produced cigarette machines, beverage machines and other electronic machinery. In 1904 he produced his first motorcycle, the Elleham motorcycle. The Elleham motorcycle is of step-tru type with the engine situated beneath the seating, thus predating the Vespa scooter by 40 years. In 1903–1904 Jacob Hansen-Ellehammer used his experience constructing motorcycles fitted with single-cylinder Peugeot Frères engines to build the world's first air-cooled radial engine, a three-cylinder engine by utilizing Peugeot Frères cylinders and heads in a home-cast engine block. The initial engine soon proved too ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1910s Danish Helicopters
Year 191 ( CXCI) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Apronianus and Bradua (or, less frequently, year 944 ''Ab urbe condita''). The denomination 191 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Parthia * King Vologases IV of Parthia dies after a 44-year reign, and is succeeded by his son Vologases V. China * A coalition of Chinese warlords from the east of Hangu Pass launches a punitive campaign against the warlord Dong Zhuo, who seized control of the central government in 189, and held the figurehead Emperor Xian hostage. After suffering some defeats against the coalition forces, Dong Zhuo forcefully relocates the imperial capital from Luoyang to Chang'an. Before leaving, Dong Zhuo orders his troops to loot the tombs of the Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coaxial Rotor Helicopters
In geometry, coaxial means that several three-dimensional linear or planar forms share a common axis. The two-dimensional analog is '' concentric''. Common examples: A coaxial cable is a three-dimensional linear structure. It has a wire conductor in the centre (D), a circumferential outer conductor (B), and an insulating medium called the dielectric (C) separating these two conductors. The outer conductor is usually sheathed in a protective PVC outer jacket (A). All these have a common axis. The dimension and material of the conductors and insulation determine the cable's characteristic impedance and attenuation at various frequencies. Coaxial rotors are a three-dimensional planar structure: a pair of helicopter rotors (wings) mounted one above the other on concentric shafts, with the same axis of rotation (but turning in opposite directions). In loudspeaker design, coaxial speakers A coaxial loudspeaker is a loudspeaker system in which the individual driver units radiate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
