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Typical trajectory and mission profiles are shown in figures 42 and 43, which show the basic event sequences and the pertinent parameters. The shuttle is, and has been, a marvelous machine. It represents the best in a multiple-purpose, finely-tuned, complex space system designed to meet very demanding requirements. Although its cost per launch did not meet expectations and the operations are more complex than desired, its 60-plus manned missions illustrate its capability. A recent one was the capture and repair of the Hubble Space Telescope.

The upper ends of the tanks were attached using a spider beam that also attached the second stage SIV. The tanks containing the cryo propellants had to have longitudinal slippage to account for thermal contraction, thus the load paths from the first stage engines were through the center tank and the four fixed fuel tanks. The sliding joint on the lox tanks were at the upper end as a connection to the spider allowed for the thermal expansion. The second stage, SIV, was a liquid hydrogen/lox stage powered by a cluster of RL-10 engines.

32 Figure 25. Skylab Saturn V configuration comparison. 33 stayed in orbit for several years. If the shuttle had made its original operations goal (launch), Skylab would have been reboosted and used as a forerunner to the planned larger space station. However, this did not happen and Skylab reentered the atmosphere, landing in Australia. 2. Evolution/Creativity/Innovation. , trans-lunar versus Earth-orbit rendezvous and docking. As history bears out, this heated debate ended with general acceptance of the trans-lunar injection.

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A History Of Aerospace Problem,Their Solutions,Their Lessons by R. S. Ryan

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