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The Quadrajet is a four barrel carburetor with a "spread bore" throttle plate, made by the Rochester Products Division of General Motors. Its first application was the new-for-1965 Chevy 396ci engine .
An example of the effect of rotor blade number is the UH-72 (EC145 variant); the A model had four blades, but the UH-72B was changed to five blades which reduced vibration. [24] Other blade numbers are possible, for example, the CH-53K , a large military transport helicopter has a seven blade main rotor.
The tail rotor system rotates airfoils, small wings called blades, that vary in pitch in order to vary the amount of thrust they produce.The blades most often utilize a composite material construction, such as a core made of aluminum honeycomb or plasticized paper honeycomb, covered in a skin made of aluminum or carbon fiber composite.
Thin blade sections are used and the blades are swept back in a scimitar shape (scimitar propeller) in a manner similar to wing sweepback, so as to delay the onset of shockwaves as the blade tips approach the speed of sound. The maximum relative velocity is kept as low as possible by careful control of pitch to allow the blades to have large ...
Most intermeshing designs have two blades per mast, although exceptions such as the Kellett XR-10 with three blades per mast do exist. The arrangement was developed in Germany by Anton Flettner for a small anti-submarine warfare helicopter, the Flettner Fl 265 as the pioneering example, and later the Flettner Fl 282 Kolibri . [ 1 ]
On 30 September 2017, Air France Flight 66, an Airbus A380 with registration F-HPJE, suffered an uncontained engine failure during flight where the entire fan module (blades and disc) and nose cowl on its number-four GP7270 engine separated from the engine.
The de Havilland Comet, the first commercial jetliner, used four jet engines.. A four-engined jet, sometimes called a quadjet, is a jet aircraft powered by four engines.The presence of four engines offers increased power and redundancy, allowing such aircraft to be used as airliners, freighters, and military aircraft.
Further refinements include making the blades from a light material such as titanium and to manufacture them with a hollow cross-section. Modern jet engines such as the Rolls-Royce Trent 900 and the Engine Alliance GP7000 , which both power the Airbus A380 , are examples of engines with wide-chord fans.
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