Editing Apollo program (section)

===Saturn IB===
{{main|Saturn IB}}

The Saturn IB was an upgraded version of the Saturn I. The [[S-IB]] first stage increased the thrust to {{convert|1600000|lbf|kN|sigfig=3}} by uprating the H-1 engine. The second stage replaced the S-IV with the [[S-IVB|S-IVB-200]], powered by a single [[Rocketdyne J-2|J-2]] engine burning liquid hydrogen fuel with LOX, to produce {{convert|200000|lbf|kN|sigfig=3|lk=on}} of thrust.<ref>{{cite web|url=https://history.nasa.gov/SP-4205.pdf|title=Influences on Booster Determination|pages=44–46|website=NASA HQ|access-date=November 11, 2022}}</ref> A restartable version of the S-IVB was used as the third stage of the Saturn V. The Saturn IB could send over {{convert|40000|lb|kg|sigfig=3}} into low Earth orbit, sufficient for a partially fueled CSM or the LM.<ref>{{cite book |title=Saturn IB News Reference |url=https://www.scribd.com/doc/58939029/Saturn-IB-News-Reference |format=PDF |access-date=August 1, 2013 |date=December 1965 |publisher=NASA; [[Chrysler|Chrysler Corporation]]; [[Douglas Aircraft Company|McDonnell Douglas Astronautics Company]]; [[IBM|International Business Machines Corporation]]; [[Rocketdyne]] |oclc=22102803 |chapter=Saturn IB Design Features}}</ref> Saturn IB launch vehicles and flights were designated with an AS-200 series number, "AS" indicating "Apollo Saturn" and the "2" indicating the second member of the Saturn rocket family.<ref name="Origin of NASA's Names" />