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The statement that the first stage would have had the same takeoff thrust (1,000,000 lb) as the S-II stage normally has in space, is probably incorrect and needs better investigation. As the INT-19 section alludes to, it is a fact of rocket physics that an engine has less thrust at sea level (14.7 psia) than in space (vacuum); in essence the atmospheric pressure acts to inhibit the thrust. This is why it talks about modifying the J-2 engine to change the nozzle expansion ratio, in an effort to counteract this. If you just took an off-the-shelf S-II and fired it at sea level without any modification, the thrust would actually be significantly less than 1,000,000 lb. (exactly how much I can't say), and I would guess there would be a chance of it not being able to lift off (thrust less than total vehicle weight.) Just because this number is quoted in Astronautix doesn't necessarily make it so; as several Wikiproject Spaceflight discussions have noted, this is one of those sources where you have to be careful. JustinTime55 ( talk) 21:37, 12 June 2012 (UTC)
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![]() | This article is rated Start-class on Wikipedia's
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The statement that the first stage would have had the same takeoff thrust (1,000,000 lb) as the S-II stage normally has in space, is probably incorrect and needs better investigation. As the INT-19 section alludes to, it is a fact of rocket physics that an engine has less thrust at sea level (14.7 psia) than in space (vacuum); in essence the atmospheric pressure acts to inhibit the thrust. This is why it talks about modifying the J-2 engine to change the nozzle expansion ratio, in an effort to counteract this. If you just took an off-the-shelf S-II and fired it at sea level without any modification, the thrust would actually be significantly less than 1,000,000 lb. (exactly how much I can't say), and I would guess there would be a chance of it not being able to lift off (thrust less than total vehicle weight.) Just because this number is quoted in Astronautix doesn't necessarily make it so; as several Wikiproject Spaceflight discussions have noted, this is one of those sources where you have to be careful. JustinTime55 ( talk) 21:37, 12 June 2012 (UTC)
Hello fellow Wikipedians,
I have just modified 2 external links on Saturn II. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
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