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{{Short description|Upper stage for NASA's Saturn I rocket}}
[[Image:S-IV rocket stage.jpg|thumb]]▼
{{Infobox rocket stage
The '''S-IV''' was the [[Multistage rocket|second stage]] of the [[Saturn I]], a [[Rocket| rocket-powered]] [[launch vehicle]] used by [[NASA]] for early flights in the [[Project Apollo|Apollo]] program.▼
|name = S-IV
|caption = Schematics of the S-IV
|manufacturer = [[Douglas Aircraft Company]]
|country = United States
|rockets = [[Saturn I]] (stage 2)
|height = {{convert|12.19|m|ft|abbr=on}}
|diameter = {{convert|5.49|m|ft|abbr=on}}
|mass = {{convert|50,576|kg|lb|abbr=on}}
|propmass = {{Convert|45,359|kg|lb|sigfig=3|abbr=on}}
| empty = {{Convert|5,217|kg|lb|sigfig=3|abbr=on}}
| status = Retired
| launches = 6
| success = 6
| fail = 0
| first = January 29, 1964
| last = July 30, 1965
{{Infobox rocket/stage
| name = S-IV 100 series
|engines = 6 [[RL-10 (rocket engine)|RL-10]] engines
|thrust = {{convert|400|kN|lbf|abbr=on}}
| SI = {{Convert|410|isp|abbr=on}}
| burntime = 482 s
| fuel = [[LH2|LH<sub>2</sub>]] / [[Liquid oxygen|LOX]]
}}
}}
▲The '''S-IV''' was the [[Multistage rocket|second stage]] of the [[Saturn I]]
The S-IV was manufactured by the [[Douglas Aircraft Company]] and later modified by them to the [[S-IVB]], a similar but distinct stage used on the [[Saturn IB]] and [[Saturn V]] rockets.<ref name="stages1">{{Harvnb|Bilstein|1999|loc=p. 157}}</ref>
The S-IV stage was a large LOX/LH2-fueled rocket stage used for the early test flights of the Saturn I rocket. It formed the second stage of the Satun I and was powered by a cluster of six [[RL-10]] engines. The cryogenic LH2 ([[liquid hydrogen]]) and LOX ([[liquid oxygen]]) tanks were separated by a common bulkhead. The forward bulkhead of the LOX tank formed the aft bulkhead of the LH2 tank. This saved about ten tons of structural weight.▼
▲The S-IV stage was a large LOX/
==References==▼
{{reflist}}
{{refbegin}}
*{{cite book|title=Stages to Saturn: A Technological History of the Apollo/Saturn Launch |url=https://books.google.com/books?id=JnoZTbVLx0MC|author=Bilstein, Roger E.|publisher=DIANE Publishing |year=1999|accessdate=2010-05-04|chapter=6| isbn=9780788181863 |ref=CITEREFBilstein1999}}
*{{cite web | url =
{{refend}}
{{Upper stages}}
▲==References==
▲{{cite web | url = http://history.nasa.gov/apsr/Apollopt1-1.pdf |format=PDF| title = Apollo Program Summary Report, Part 1 | author = NASA | month = April | year = 1975 }}
[[Category:Apollo program]]
[[Category:Rocket stages]]
[[Category:Saturn I]]
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