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BOAC Flight 781 was a scheduled British Overseas Airways Corporation passenger flight from Singapore to London. On 10 January 1954, a de Havilland Comet passenger jet operating the flight suffered an explosive decompression at altitude and crashed, killing all 35 people on board.
The open belt drive has parallel shafts rotating in the same direction, whereas the cross-belt drive also bears parallel shafts but rotate in opposite direction. The former is far more common, and the latter not appropriate for timing and standard V-belts unless there is a twist between each pulley so that the pulleys only contact the same belt ...
BBC World Service Logo used since 2022 Type Radio broadcasting news, speech, discussions, public broadcaster Country United Kingdom Availability Worldwide Headquarters Broadcasting House, London Broadcast area Worldwide Owner BBC Key people Jonathan Munro Launch date 19 December 1932 ; 91 years ago (1932-12-19) Former names BBC Empire Service BBC Overseas Service External Services of the BBC ...
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It would touch down on the comet's surface at a velocity of around 1 metre per second (3.6 km/h; 2.2 mph). [79] The legs were designed to dampen the initial impact to avoid bouncing as the comet's escape velocity is only around 1 m/s (3.6 km/h; 2.2 mph), [80] and the impact energy was intended to drive ice screws into the surface. [81]
Serpentine belt (foreground) and dual vee belt (background) on a bus engine Belt tensioner providing pressure against the back of a serpentine belt in an automobile engine. A serpentine belt (or drive belt [1]) is a single, continuous belt used to drive multiple peripheral devices in an automotive engine, such as an alternator, power steering pump, water pump, air conditioning compressor, air ...