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(170 hr) This was the first shuttle mission in which there was a problem with the
engines. The center engine had to be shut down and the shuttle was placed into
a lower orbit. Most experiments went on as usual, however. The mission was ...
The return trip by Lyakhov and Mohmand was delayed because of problems
involving the firing of the reentry engines. A computer signal shut down the
engines after firing for only 25% of the necessary time because an incorrect
orientation of ...
For a variety of reasons, rocket engines cannot pump a tank completely dry or
consume the vaporized propellants in it. Thus, a certain amount of propellant.
referred to as ullage, is always left in the tanks when they are "empty." In addition
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Seismology Observational 17 Stochastic Description
Seismology Theoretical 47 Solar Chimneys
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