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olasek
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« Reply #210 on: 03/01/2012 10:13 PM » |
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I am looking for ascent data for any SpaceX launch vehicle.
I need range, altitude and velocity data all the way from T-0 to orbital insertion.
I found a very good graphics showing Falcon 1 ascent profile (based on its 09/2008 launch) but there is no velocity information. At this point I will settle for data of any precision since it would be better than nothing.
This is needed for some journal paper.
Thanks in advance for any help.
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deltaV
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« Reply #211 on: 03/01/2012 10:22 PM » |
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I am looking for ascent data for any SpaceX launch vehicle.
I need range, altitude and velocity data all the way from T-0 to orbital insertion.
I found a very good graphics showing Falcon 1 ascent profile (based on its 09/2008 launch) but there is no velocity information. At this point I will settle for data of any precision since it would be better than nothing.
This is needed for some journal paper.
Thanks in advance for any help.
Have you tried contacting SpaceX?
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olasek
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« Reply #212 on: 03/02/2012 12:21 AM » |
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Have you tried contacting SpaceX?
Yes, I did, too early to tell if they will reply. I was hoping that perhaps this info is already somewhere burried in this thread, for example the document outlining their 09/2008 test with good (range,altitude) profile is already available.
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Antares
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« Reply #213 on: 03/02/2012 02:08 AM » |
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Didn't they publish one of their flight reports? It's probably not still on their web site, but it's probably "out there" among the digital pack rats.
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ugordan
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« Reply #214 on: 03/02/2012 09:56 AM » |
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Yes, the one with the first Merlin 1c flight, F1-03 can be found somewhere on the net, has some plots of range/altitude actual vs. predicted, but IIRC no velocity data. It was made for some conference, not wide public release so it's not easy to find.
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Pedantic Twit
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« Reply #215 on: 03/02/2012 10:43 AM » |
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Yes, the one with the first Merlin 1c flight, F1-03 can be found somewhere on the net, has some plots of range/altitude actual vs. predicted, but IIRC no velocity data. It was made for some conference, not wide public release so it's not easy to find.
Are you referring to this? (F1-04)As you said, there's plots of downrange/altitude but no velocity.
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ugordan
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« Reply #216 on: 03/02/2012 11:39 AM » |
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Yes, that's the one. I confused it with flight 3 report for some reason.
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TOG
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« Reply #217 on: 03/02/2012 12:43 PM » |
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There are myriad other ways to determine what rocket fuel they're using. It comes in trucks. Those trucks need hazmat permits from the State of Texas. Fuel has to be stored. The storage facility needs permits. Local FD's need to have plans in place for every contingency. When the government wants to be secret, they can, by speaking those two powerful words - "national security". Private companies aren't afforded that same luxury. Either you buy up an entire west Texas county, wall it in, and provide your own infrastructure for EVERYTHING, or you cooperate with local officials whose work will inevitably be FOIA-able.
Literally hundreds of ways to deduce what's going on without looking at an exhaust plume!
What about a different possibility? Could they build the "bunker" in such a way that they could use a rollout system with a strongback ala CCAFS? Would that facilitate quicker test turnarounds, practice for actual launch, WDR, and even (dare I say it) actual launches from west Texas? Even if they did not launch from there, they could do an integrated test fire and then transport the launch vehicle (mostly) intact to the desired launch location... And finally, would that be cheaper and/or less of a risk to the vehicle than using a crane to put it up on the firing stand?
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Jim
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« Reply #218 on: 03/02/2012 01:33 PM » |
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then transport the launch vehicle (mostly) intact to the desired launch location...
And finally, would that be cheaper and/or less of a risk to the vehicle than using a crane to put it up on the firing stand?
Too long and it would not be cheaper
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StephenB
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« Reply #219 on: 03/02/2012 05:40 PM » |
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Are you referring to this? (F1-04)
As you said, there's plots of downrange/altitude but no velocity.
If you know position and time you can calculate velocity, right?
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Robotbeat
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« Reply #220 on: 03/02/2012 05:42 PM » |
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Are you referring to this? (F1-04)
As you said, there's plots of downrange/altitude but no velocity.
If you know position and time you can calculate velocity, right?
Is segment size proportional to time?  But seriously, it is probably possible to do some parametric modeling to recover the velocity data.
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simonbp
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« Reply #221 on: 03/02/2012 10:07 PM » |
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But seriously, it is probably possible to do some parametric modeling to recover the velocity data.
Or, even easier, match up a few time points (i.e. staging, downrange) from a recording of the live feed...
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edkyle99
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« Reply #222 on: 03/02/2012 11:12 PM » |
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"To fire all 27 engines at the same time, which is required to lift the massive rocket, a test stand will be built deep into the earth."
But I'll take your word for it until we see otherwise (as in an actually underground facility).
The flame trench approach allows water to be poured onto the flame deflector during the burn, suppressing acoustic energy. Water cannot perform that function with the big elevated stand now used. But even with water suppression, it is still going to be loud.  They're probably not suppressing acoustics just to be nice to the neighbors either. Acoustic loads can actually damage things, like the rocket, if they get big enough. - Ed Kyle
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olasek
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« Reply #223 on: 03/02/2012 11:17 PM » |
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But seriously, it is probably possible to do some parametric modeling to recover the velocity data.
Too many unknowns to do it right. Yes, if you had just a few points you could perhaps fill in the rest (doing the best you can) but you will never be sure how close you are to reality. I am looking into similar data for Delta/Atlas, etc. if I can get two trajectories to have similar enough shape I could perhaps deduct that velocities would be similar too. I do have STS data but this is such a unique configuration and ascent trajectory itself is so non-standard that I can't reliably use STS velocities. By the way if someone had data for Atlas or Delta I would be greatful for that. If you know position and time you can calculate velocity, right?
I only know position (range,alt), I don't have time. Another alternative I am looking at: watch some youtube videos and listen to velocity being announced by the (infrequent) background voice. Not the best but better than nonthing. 
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ugordan
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« Reply #224 on: 03/03/2012 11:12 AM » |
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First firing (10 s) of the F9-04 booster at McGregor happened Friday at around 7:15 PM.
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