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DH.88 Comet
The de Havilland DH.88 Comet is a British two-seat, twin-engined aircraft built by the de Havilland Aircraft Company. It was developed specifically to participate in the 1934 England-Australia MacRobertson Air Race from the United Kingdom to Australia. Development of the Comet was seen as both a prestige project and an entry into the use of modern techniques. It was designed around the specific requirements of the race. Despite being made of wood, it was the first British aircraft to incorporate in one airframe all the elements of the modern high speed aircraft - stressed-skin construction, cantilever monoplane flying surfaces, retractable undercarriage, landing flaps, variable-pitch propellers and an enclosed cockpit. Three Comets were produced for the race, all for private owners at the discounted price of £5,000 per aircraft. The aircraft underwent a rapid development cycle, performing its maiden flight only six weeks prior to the race. Comet G-ACSS ''Grosvenor House'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arthur Octavius Edwards
Arthur Octavius Edwards (1876–1960) was an English builder, property developer and hotel manager best known for building the Grosvenor House Hotel in London in the 1920s. Edwards was born in 1876 in Ripley, Derbyshire, the son of Edgar James and Ellen Edwards; his father was a civil engineer. He first worked in a drawing office in Westminster before moving to Ceylon to work on building Railways. On his turn to England he was involved in the re-building of the Savoy Hotel. With a "considerable professional ability and a shrewd eye" for business he soon gained interests in South Africa and the United States. Edwards built the Grosvenor House Hotel in the 1920s and it opened in 1929 on the site of Grosvenor House, the former London residence of the Dukes of Westminster, whose family name is Grosvenor. Edwards was managing director and chairman for 10 years. He was not a pilot but had an interest in aviation, in 1934 he purchased a de Havilland DH.88 Comet race to compete in th ... [...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] |
Jim Mollison
James Allan Mollison Order of the British Empire, MBE (19 April 1905 – 30 October 1959) was a Scottish pioneer aviator who, flying solo or with his wife, Amy Johnson, set many records during the rapid development of aviation in the 1930s. Early years Born on 19 April 1905 in Glasgow, the only child of Hector Alexander Mollison, a consultant engineer, and Thomasina Macnee Addie (''d''. 1965). He was educated at The Glasgow Academy and Edinburgh Academy. He was attracted at an early age to flying. Obtaining his Royal Air Force (RAF) Short Service Commission at 18, he was the youngest officer in the service, and upon completion of training was posted to India, flying on active service in Waziristan campaign (1921–1924), Waziristan.Aitken 1991, p. 343. Aviation career At the age of 22, Mollison became a flying instructor at Central Flying School (CFS), again setting the record for being the youngest in this role. Shortly after, he transferred to the RAF Reserve and devot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnesium
Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a shiny gray metal having a low density, low melting point and high chemical reactivity. Like the other alkaline earth metals (group 2 of the periodic table) it occurs naturally only in combination with other elements and it almost always has an oxidation state of +2. It reacts readily with air to form a thin passivation coating of magnesium oxide that inhibits further corrosion of the metal. The free metal burns with a brilliant-white light. The metal is obtained mainly by electrolysis of magnesium salts obtained from brine. It is less dense than aluminium and is used primarily as a component in strong and lightweight alloys that contain aluminium. In the cosmos, magnesium is produced in large, aging stars by the sequential addition of three helium nuclei to a carbon nucleus. When such stars explode as supernovas, much of the magnesium is expelled into the interstellar medium where it ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stress (mechanics)
In continuum mechanics, stress is a physical quantity. It is a quantity that describes the magnitude of forces that cause deformation. Stress is defined as ''force per unit area''. When an object is pulled apart by a force it will cause elongation which is also known as deformation, like the stretching of an elastic band, it is called tensile stress. But, when the forces result in the compression of an object, it is called compressive stress. It results when forces like tension or compression act on a body. The greater this force and the smaller the cross-sectional area of the body on which it acts, the greater the stress. Therefore, stress is measured in newton per square meter (N/m2) or pascal (Pa). Stress expresses the internal forces that neighbouring particles of a continuous material exert on each other, while strain is the measure of the deformation of the material. For example, when a solid vertical bar is supporting an overhead weight, each particle in the bar pushe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gipsy Six
The de Havilland Gipsy Six is a British six-cylinder, air-cooled, inverted inline piston engine developed by the de Havilland Engine Company for aircraft use in the 1930s. It was based on the cylinders of the four-cylinder Gipsy Major and went on to spawn a whole series of similar aero engines that were still in common use until the 1980s. The engines were of particular note for their exceptionally low cross-sectional area, a drag-reducing feature which made them ideal for the many racing aircraft of that period. In 1934, the basic bronze-headed Gipsy Six, rated at 185 horsepower (138 kW) at 2,100 rpm was modified for use in the DH.88 Comet air racer as the Gipsy Six "R" which produced 223 horsepower (166 kW) at 2,400 rpm for takeoff. Many Gipsy Six engines remain in service powering vintage aircraft types today. Design and development The De Havilland Engine Company company had hoped to produce a version of the basic engine capable of utilising a hydraulicall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aspect Ratio (aeronautics)
In aeronautics, the aspect ratio of a wing is the ratio of its span to its mean chord. It is equal to the square of the wingspan divided by the wing area. Thus, a long, narrow wing has a high aspect ratio, whereas a short, wide wing has a low aspect ratio.Kermode, A.C. (1972), ''Mechanics of Flight'', Chapter 3, (p.103, eighth edition), Pitman Publishing Limited, London Aspect ratio and other features of the planform are often used to predict the aerodynamic efficiency of a wing because the lift-to-drag ratio increases with aspect ratio, improving the fuel economy in powered airplanes and the gliding angle of sailplanes. Definition The aspect ratio \text is the ratio of the square of the wingspan b to the projected wing area S, which is equal to the ratio of the wingspan b to the standard mean chord \text: \text \equiv \frac = \frac Mechanism As a useful simplification, an airplane in flight can be imagined to affect a circular cylinder of air with a diameter equal to th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tapered Wing
The wing configuration of a fixed-wing aircraft (including both gliders and powered aeroplanes) is its arrangement of lifting and related surfaces. Aircraft designs are often classified by their wing configuration. For example, the Supermarine Spitfire is a conventional low wing cantilever monoplane of straight elliptical planform with moderate aspect ratio and slight dihedral. Many variations have been tried. Sometimes the distinction between them is blurred, for example the wings of many modern combat aircraft may be described either as cropped compound deltas with (forwards or backwards) swept trailing edge, or as sharply tapered swept wings with large leading edge root extensions (or LERX). Some are therefore duplicated here under more than one heading. This is particularly so for variable geometry and combined (closed) wing types. Most of the configurations described here have flown (if only very briefly) on full-size aircraft. A few theoretical designs are also notable ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gipsy Six R
The Romani (also spelled Romany or Rromani , ), colloquially known as the Roma, are an Indo-Aryan ethnic group, traditionally nomadic itinerants. They live in Europe and Anatolia, and have diaspora populations located worldwide, with significant concentrations in the Americas. In the English language, the Romani people are widely known by the exonym Gypsies (or Gipsies), which is considered pejorative by many Romani people due to its connotations of illegality and irregularity as well as its historical use as a racial slur. For versions (some of which are cognates) of the word in many other languages (e.g., , , it, zingaro, , and ) this perception is either very small or non-existent. At the first World Romani Congress in 1971, its attendees unanimously voted to reject the use of all exonyms for the Romani people, including ''Gypsy'', due to their aforementioned negative and stereotypical connotations. Linguistic and genetic evidence suggests that the Roma originated ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
