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AJS racing motorcycle showing typical pre-unit construction engine and gearbox layout with mounting plates, slotted holes and screw-thread adjusters visible. Pre-unit construction, [1] also called separate construction, is a motorcycle engine architecture where the engine and gearbox are separate components with their own oil reservoirs, linked by a driving chain within a primary chaincase.
In 1938, Francis-Barnett offered a 125 cc unit-construction Snipe. [14] In 1946, the Series B Vincent employed unit construction and used the engine-gearbox as a stressed member of the frame. [15] The 1947 Sunbeam S7, an advanced overhead-cam, longitudinal twin, unit construction motorcycle, designed by Erling Poppe, used shaft drive. [3]
Harley-Davidson Twin Cam engine at the Harley-Davidson Museum. The Harley-Davidson Twin Cam are motorcycle engines made by Harley-Davidson from 1998 to 2017. Although these engines differed significantly from the Evolution engine, which in turn was derived from the series of single camshaft, overhead valve motors that were first released in 1936, they share a number of characteristics with ...
Kit-of-parts construction is a special subset of pre-fabrication that not only attempts to achieve flexibility in assembly and efficiency in manufacture, but also by definition requires a capacity for demountability, disassembly, and reuse. Kit-of-parts structures can be assembled and taken apart in a variety of ways like a construction toy.
Motorcycle construction is the engineering, manufacturing, and assembly of components and systems for a motorcycle which results in the performance, cost, and aesthetics desired by the designer. With some exceptions, construction of modern mass-produced motorcycles has standardised on a steel or aluminium frame , telescopic forks holding the ...
Hush kit for the Pratt and Whitney JT8D-1 through -17 engines Two JT4As installed on a KLM DC-8. A hush kit is an aerodynamic device used to help reduce the noise produced by older aircraft jet engines. These devices are typically installed on older turbojet and low-bypass turbofan engines, as they are much louder than later high-bypass ...
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"Quick-build" kits are available which have the cutting, shaping, and hole-drilling mostly done, requiring only finishing and assembly. Such kits are also available for the other types of aircraft construction, especially composite. [1] [2] There are three main types of metal construction: sheet aluminum, tube aluminum, and welded steel tube.