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Launching the Space Shuttle The engines burn liquid hydrogen and liquid oxygen, which are stored in the external fuel tank (ET), at a ratio of 6:1.
They draw liquid hydrogen and oxygen from the where can i buy pandora charms ET at an amazing rate, equivalent to emptying a family swimming pool every 10 seconds! The fuel is partially burned in a pre chamber to produce high pressure, hot gases that drive the turbo pumps (fuel pumps). The fuel is then fully burned in the main combustion chamber and the exhaust gases (water vapor) leave the nozzle at approximately 6,000 mph (10,000 km/h). Each engine can generate between 375,000 and 470,000 lb (1,668,083 to 2,090,664 N) of thrust; the rate of thrust can be controlled from 65 percent to 109 percent maximum thrust. The engines are mounted on gimbals (round bearings) that control the direction of the exhaust, which controls the forward direction of the rocketThe ET is made of aluminum and aluminum composite materials. It has two separate tanks inside, the forward tank for oxygen and the aft tank for hydrogen, separated by an intertank region. Each tank has baffles to dampen the motion of fluid inside. Fluid flows from each tank through a 17 inch (43 cm) diameter feed line out of the ET through an umbilical line into the shuttle's main engines. Through these lines, oxygen can flow at a maximum rate of 17,600 gallons/min (66,600 l/min) and hydrogen can flow at a maximum rate of 47,400 gallons/min (179,000 l/min).The Trouble with O ringsDuring the January 1986 launch of Challenger, the temperature was below zero. The cold jewelry show shrank the rubber o rings and they did not seal the joints properly. During ascent, hot gases escaped through one of the joints of the SRB. Like a blowtorch, the gases cut through the thin pandora style charm bracelets skin of the ET cheap pandora jewellery and ignited the liquid hydrogen fuel. Challenger broke up and the crew was lost. NASA re designed the SRB joints, implemented new rules regarding launches in cold weather, and built a new system for the crew to escape from the shuttle during ascent.
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