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The Saturn INT-21 was a study for an American orbital launch vehicle of the 1970s. It was derived from the Saturn V rocket used for the Apollo program, using its first and second stages, but lacking the third stage. The guidance unit would be moved from the top of the third stage to the top of the second stage. The INT-21 was never flown. A related variant was launched once, from the Kennedy Space Center, Florida carrying the Skylab space station into orbit, at 17:30 GMT, on May 14, 1973. As ''Skylab'' was built from an S-IVB stage, there was no need to move the guidance unit. This version was intended to be used for other flights in the Apollo Applications Program, and would have also been used to launch other American space stations, including Skylab B. ==See also== *Comparison of orbital launch systems *Apollo program *Saturn I *Saturn IB *Saturn V *Skylab *Apollo Applications Program *S-IC *S-II *Saturn I SA-1 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Saturn INT-21」の詳細全文を読む スポンサード リンク
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