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Stressed Skin
In mechanical engineering, stressed skin is a type of rigid construction, intermediate between monocoque and a rigid frame with a non-loaded covering. A stressed skin structure has its compression-taking elements localized and its tension-taking elements distributed. Typically, the main frame has rectangular structure and is triangulated by the covering. Description A framework box can be distorted from being square, so it isn't rigid by itself, however adding diagonals that take either tension or compression fixes this, because the box cannot deviate from right angles without altering the diagonals. Sometimes flexible members like wires are used to provide tension, or rigid compression frames are used, as with a Warren or Pratt truss, however both these are full frame structures. When the skin or outer covering is in tension so that it provides a significant portion of the rigidity, the structure is said to have a stressed skin design. This may also be referred to as semi-mon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zeppelin-Lindau (Do) D
Luftschiffbau Zeppelin GmbH is a German aircraft manufacturing company. It is perhaps best known for its leading role in the design and manufacture of rigid airships, commonly referred to as ''Zeppelins'' due to the company's prominence. The name 'Luftschiffbau' is a German word meaning ''building of airships''. The company was founded by Count Ferdinand von Zeppelin in 1908 as a formal entity to continue advancing his pioneering research into rigid airships. ''Luftschiffbau Zeppelin'' became the leading manufacturer in the field of large lighter-than-air vehicles; its products were used in both military and civilian capacities. The firm founded DELAG, the world's first airline to use an aircraft in revenue service, in 1909 on the back of public interest and using its own airships. During the First World War, Zeppelins were employed as the first long distance strategic bombers, launching numerous raids upon Belgium, France, and the United Kingdom. Following Count von Zeppelin's ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AEC Routemaster
The AEC Routemaster is a Front-engine, rear-wheel-drive layout, front-engined double-decker bus that was designed by London Transport Executive, London Transport and built by the Associated Equipment Company (AEC) and Park Royal Vehicles. The first prototype was completed in September 1954 and the last one was delivered in 1968. The layout of the vehicle was conventional for the time, with a half-cab, front-mounted engine and open rear platform, although the coach version was fitted with rear platform doors. Forward entrance vehicles with platform doors were also produced as was a unique front-entrance prototype with the engine mounted transversely at the rear. The first Routemasters entered service with London Transport in February 1956 and the last were withdrawn from regular service in December 2005, although two TfL heritage routes were subsequently operated by Routemasters in central London until 2019. Most Routemasters were built for London Transport (brand), London Tran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GM New Look Bus
The GM New Look bus is a municipal transit bus that was introduced in 1959 by the Truck and Coach Division of General Motors to replace the company's previous coach, retroactively known as the GM "old-look" transit bus. Also commonly known by the nickname "Fishbowl" (for its original six-piece rounded windshield, later replaced by a two-piece curved pane), it was produced until 1977 in the US, and until 1985 in Canada.Stauss (1988), p. 30. More than 44,000 New Look buses were built. Its high production figures and long service career made it an iconic North American transit bus. The design is listed as by Roland E. Gegoux and William P. Strong. Production overview 44,484 New Look buses were built over the production lifespan, of which 33,413 were built in the U.S. and 11,071 were built in Canada ( GM Diesel Division). Separated by general type, the production figures comprised 510 city buses (all U.S.-built); 9,355 city buses (7,804 U.S.-built, 1,551 Canadian); 31,348 c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northrop Alpha
The Northrop Alpha was an American single-engine, all-metal, seven-seat, low-wing monoplane fast mail/passenger transport aircraft used in the 1930s. Design work was done at the Avion Corporation, which in 1929, became the Northrop Aircraft Corporation based in Burbank, California. Design and development Drawing on his experience with the Lockheed Vega, John K. Northrop designed an advanced mail/passenger transport aircraft. In addition to all-metal construction, the new Alpha benefitted from two revolutionary aerodynamic advancements: wing fillets researched at the Guggenheim Aeronautical Laboratory at the California Institute of Technology, and a multicellular stressed-skin wing of Northrop's own design which was later successfully used on the Douglas DC-2 and Douglas DC-3. In addition, the Alpha was the first commercial aircraft to use rubber deicer boots on wing and empennage leading edges which, in conjunction with state-of-the-art radio navigation equipment, gave it day o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zeppelin-Staaken E-4/20
The Zeppelin-Staaken E-4/20 was a revolutionary four-engine all-metal passenger monoplane designed in 1917 by Adolf Rohrbach and completed in 1919 at the Zeppelin-Staaken works outside Berlin, Germany. The E-4/20 was the first four-engine, all-metal stressed skin heavier-than-air airliner built. Design and development At a time when most aircraft were small, single-engine biplanes made of wood and canvas, the E-4 was a large (102-foot wingspan), all-metal, four-engine, stress-skinned, semi-monocoque, cantilevered-wing monoplane, with an enclosed cockpit, and accommodation for 18 passengers plus a crew of five, including two pilots, a radio operator, an engineer and a steward, as well as radio-telegraph communications, a toilet, a galley and separate baggage and mail storage. With a maximum speed of 143 mph, cruising speed of , a range of about , and a fully loaded weight of , it outperformed most other airliners of its day. The E-4 included numerous innovations, including ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zeppelin-Lindau (Dornier) Rs
Luftschiffbau Zeppelin GmbH is a German aircraft manufacturing company. It is perhaps best known for its leading role in the design and manufacture of rigid airships, commonly referred to as ''Zeppelins'' due to the company's prominence. The name 'Luftschiffbau' is a German word meaning ''building of airships''. The company was founded by Count Ferdinand von Zeppelin in 1908 as a formal entity to continue advancing his pioneering research into rigid airships. ''Luftschiffbau Zeppelin'' became the leading manufacturer in the field of large lighter-than-air vehicles; its products were used in both military and civilian capacities. The firm founded DELAG, the world's first airline to use an aircraft in revenue service, in 1909 on the back of public interest and using its own airships. During the First World War, Zeppelins were employed as the first long distance strategic bombers, launching numerous raids upon Belgium, France, and the United Kingdom. Following Count von Zeppelin's ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Short Silver Streak
The Short Silver Streak was the first British all-metal aircraft.Jackson 1973, p. 297. It was designed and built by Short Brothers at Rochester, Kent, England. Although ''Flight'' magazine claimed that it was the first instance of stressed skin construction in the world, it was preceded by a number of Dornier designs, including the Dornier-Zeppelin D.I, which was ordered into production. Development The Silver Streak was a single-seat biplane with a semi-monocoque duralumin fuselage and duralumin-covered wings. The wing skin was not stressed. The Silver Streak had a conventional landing gear and was powered by a Siddeley Puma engine. The Silver Streak was exhibited in July 1920 at the Olympia in London. Registered G-EARQ, it was first flown at Grain on 20 August 1920 by test pilot J. L. Parker. It was later modified as a two-seater and delivered to the Air Ministry in February 1921 for both flight and static testing. The Air Ministry issued a specification for a two-seat recon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unibody
A vehicle frame, also historically known as its '' chassis'', is the main supporting structure of a motor vehicle to which all other components are attached, comparable to the skeleton of an organism. Until the 1930s, virtually every car had a structural frame separate from its body. This construction design is known as '' body-on-frame''. By the 1960s, unibody construction in passenger cars had become common, and the trend to unibody for passenger cars continued over the ensuing decades. Nearly all trucks, buses, and most pickups continue to use a separate frame as their chassis. Functions The main functions of a frame in a motor vehicle are: # To support the vehicle's mechanical components and body # To deal with static and dynamic loads, without undue deflection or distortion. :These include: ::*Weight of the body, passengers, and cargo loads. ::*Vertical and torsional twisting transmitted by going over uneven surfaces. ::*Transverse lateral forces caused by road cond ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
London Transport (brand)
London Transport (LT) was the public name and brand used by a series of public transport authorities in London, England, from 1933. Its most recognizable feature was the bar-and-circle 'roundel' logo. With its origins in the Underground Electric Railways Company of London (UERL), the brand was first used by the London Passenger Transport Board (LPTB) to unify the identity of the previously separately owned and managed London Underground, Metropolitan Railway, bus and tram services. The London Transport brand was extended under the direction of Frank Pick to all aspects of transport operation including poster designs, tickets, train livery, seat upholstery and the station architecture of Charles Holden. When public transport operation was taken over by Transport for London (TFL) from London Regional Transport (LRT) in 2000, the London Transport brand was discontinued and replaced with Transport for London's own branding, which incorporates many features of the London Transport bran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mechanical Engineering
Mechanical engineering is the study of physical machines that may involve force and movement. It is an engineering branch that combines engineering physics and mathematics principles with materials science, to design, analyze, manufacture, and maintain mechanical systems. It is one of the oldest and broadest of the engineering branches. Mechanical engineering requires an understanding of core areas including mechanics, dynamics, thermodynamics, materials science, structural analysis, and electricity. In addition to these core principles, mechanical engineers use tools such as computer-aided design (CAD), computer-aided manufacturing (CAM), and product lifecycle management to design and analyze manufacturing plants, industrial equipment and machinery, heating and cooling systems, transport systems, aircraft, watercraft, robotics, medical devices, weapons, and others. Mechanical engineering emerged as a field during the Industrial Revolution in Europe in the 18th century; ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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