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Speed of Saturn V at first staging?
On Mon, 24 Aug 2009 23:29:31 -0400, David Spain
wrote: In the curve for Vs it appears it actually is *reduced* for approx 25 seconds after launch before rising above its initial value at s=0. We're speculating its due to early rocket motion due to first stage engine gimbals? I noticed that too and I assumed it had to do with the path of the rocket and what it is measured relative to. Need some clarification though. -- Replace you know what by j to email |
#22
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Speed of Saturn V at first staging?
Vs appears to be a space-centered velocity. What is not clear from the
document are the axes against which it is measured. However, if you think of the way the rocket is climbing vertically for the first half minute, you can see that it is not gaining horizontal velocity until the tilt to the east is established. Rather than being due to drag, I'd speculate that vectors are at the root of this dip. Cheers David Author: How Apollo Flew to the Moon On Aug 25, 4:29*am, David Spain wrote: Perhaps you can explain the small dip in the curve given for Vs in Figure 1 on page 2 in the NASA Tech Note linked to below: http://www.klabs.org/history/reports...1970023342.pdf In the curve for Vs it appears it actually is *reduced* for approx 25 seconds after launch before rising above its initial value at s=0. We're speculating its due to early rocket motion due to first stage engine gimbals? David Spain- Hide quoted text - - Show quoted text - |
#23
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Speed of Saturn V at first staging?
wdw writes:
Vs appears to be a space-centered velocity. What is not clear from the document are the axes against which it is measured. However, if you think of the way the rocket is climbing vertically for the first half minute, you can see that it is not gaining horizontal velocity until the tilt to the east is established. Rather than being due to drag, I'd speculate that vectors are at the root of this dip. Cheers David Author: How Apollo Flew to the Moon So for the craft to remain vertical during the first 30s of ascent, it must essentially move in a direction somewhat opposite of the Earth's rotation, retarding Vs? Therefore it looses Vs until the Eastward tilt (pitch?) begins to give it positive V in the direction of rotation? From then on it's as one would expect. That make sense. Dave |
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