Image:SaturnV S-IVB.jpg
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Saturn V S-IVB (Third) Stage. (NASA illustration)
"This cutaway illustration shows the Saturn V S-IVB (third) stage with the callouts of its major components. When the S-II (second) stage of the powerful Saturn V rocket burnt out and was separated the remaining units approached orbit around the Earth. Injection into the desired orbit was attaineded as the S-IVB (third stage) was ignited and burnt. The S-IVB stage was powered by a single 200,000-pound thrust J-2 engine and had a re-start capability built in for its J-2 engine. The S-IVB restarted to speed the Apollo spacecraft to escape velocity injecting it and the astronauts into a moon trajectory. "
MSFC-0100983 - Saturn V S-IVB (Third) Stage (http://mix.msfc.nasa.gov/ABSTRACTS/MSFC-0100983.html)
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