Bob B.
Bob the Excel Guru?
Posts: 3,072
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Post by Bob B. on Apr 6, 2010 9:03:03 GMT -4
The number of ullage rockets on the interstage between the S-IC and S-II stages changed, with 8 on Apollo 4 and 6, 4 on Apollo 8-14, and none at all from Apollo 15 onwards. Are you sure about that? I remember some rockets being deleted from Apollo 15, and that resulted in the S-II plume hitting the top of the S-IC and killing some telemetry transmitters. It wasn't a catastrophe since the S-IC had already done its job, but I recall that some rockets were put back on to prevent a recurrence. Jason is correct about the number of ullage motors. What you're thinking of, ka9q, are the retro motors on the S-IC stage. There were normally eight of them housed in the F-1 engine fairings. On Apollo 15 the number was reduced to four, however this was increased back to eight starting with the very next mission.
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Post by ka9q on Apr 7, 2010 8:50:03 GMT -4
Yes, I am very sure. The S-IC ullage rockets are very clearly visible on the interstage, so it's a simple matter to see how many were on each rocket. If retro rockets were changed I don't know, because they are not visible on the S-IC, being inside the engine fairings. I think you mean the S-II ullage rockets were on the interstage. The S-IC didn't need ullage rockets. :-) But yeah, Bob, I was thinking of the S-IC retrorockets that were deleted from Apollo 15 and restored on Apollo 16.
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Post by Jason Thompson on Apr 7, 2010 10:19:13 GMT -4
Yes, I wondered if you would spot my deliberate mistake....
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Post by clipperride on May 27, 2011 12:09:32 GMT -4
I know this is a rather old thread now - but I have just found some more confirmation on the origins of the separation video. history.nasa.gov/ap11fj/01launch.htmThe Flight Journal for Apollo 11 has some clips, including the one shown in the first post of this thread. In the Flight Journal (at GET 000:10:01) the authors - David Woods, Ken MacTaggart and Frank O'Brien, confirms it comes from the Saturn 1b launch AS-202
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