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Galileo IUS ignition
kwan3217
post Apr 9 2007, 01:33 AM
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There are lots of pictures of Galileo being ejected from the cargo bay of the space shuttle, but so far I haven't been able to find any pictures of Galileo when the IUS first stage lit up and Galileo departed for Venus. Is this because there aren't any such pictures?

Basically I want to see what a solid fuel motor looks like when it is fired in space. I suspect it is quite different from the billowing gray smoke we are used to seeing when one is lit in the atmosphere.
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Decepticon
post Apr 9 2007, 02:06 AM
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I found this one. But thats it. http://members.aol.com/_ht_a/hattonjasonp/hasohp/GALILEO.JPG
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antipode
post Apr 9 2007, 02:22 AM
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The RocketCam site has some video of some of the little Star solid motors lighting up on Delta II missions and its entirely unremarkable - just a dazzling white light.

P
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BPCooper
post Apr 9 2007, 03:43 AM
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There are videos taken following deployments from the shuttle in the past, but it is done so far away that all you see is a big white star or splotch in the distance.


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GregM
post Apr 9 2007, 05:31 AM
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.
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tasp
post Apr 9 2007, 01:55 PM
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Regarding orientation of the shuttle to the IUS during ignition:

Since the Columbia accident, is policy to orient the shuttle to the IUS to minimize cross sectional area??

Seems like pointing the tail directly at the ignition might be preferable, damage to the TPS on a trailing surface would be better than a divot facing into the re-entry heating.

If I am overlooking something, let me know . . .
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djellison
post Apr 9 2007, 02:11 PM
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QUOTE (tasp @ Apr 9 2007, 02:55 PM) *
Since the Columbia accident, is policy to orient the shuttle to the IUS to minimize cross sectional area??


There's been nothing on the Shuttle launch manifest that includes an IUS since before Columbia as far as I know - certainly nothing in the ISS-Complete+Hubble list.

Doug
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tasp
post Apr 9 2007, 02:15 PM
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Not deploying anything with an upper stage does eliminate the concern . . .


smile.gif


{kind of obvious I haven't had my morning cup of joe . . . }
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BPCooper
post Apr 9 2007, 02:40 PM
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IUS is history. The last IUS took DSP-22 into orbit aboard a Titan IV on Feb. 14 2004.

Even before Columbia, there were no IUS deploys slated on the shuttle anymore. Chandra on STS-93 was the last.


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nprev
post Apr 9 2007, 02:49 PM
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Interesting. I didn't know that the IUS had been adapted for use with ELVs. How many were launched this way, BP?


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ugordan
post Apr 9 2007, 02:52 PM
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Seeing how the Titan IV was a kind of emergency capability mirroring the Shuttle, it's logical IUS would be compatible.


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nprev
post Apr 9 2007, 02:55 PM
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I see. Still, it's always impressive to me to see dual-application designs like this. I honestly thought that the IUS was Shuttle-only hardware.


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Jim from NSF.com
post Apr 9 2007, 03:45 PM
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DSP-14 thru 22, except number 17 flew on T-IV IUS. 17 flew on STS-44

DSP was the largest user of IUS. Before,T-IV was the CELV, only 10 launches were to be procured and DSP was a few of them. After Challenger, all moved to T-IV except the one on a previously pay for shuttle mission

The first Titan-IV was a DSP/IUS.

T-IV/IUS was an inefficient combination. It could only launch 5300lb to GSO. The IUS cost was near a T-IV Centaur. Now, an intermediate EELV could launch it. But due to many things including fairing requirements, DSP-23, the last one, is fly on a D-IV heavy


Since most Shuttle/IUS missions were performance critical, the RMS did not fly on them
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BPCooper
post Apr 9 2007, 04:03 PM
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There is a brief rundown here too:

http://www.spaceflightnow.com/titan/b39/index.html

"Saturday's mission was the 24th and final IUS launch. Dating back to 1982, IUS motors flew aboard 15 space shuttle missions, eight Titan 4 rockets and a single Titan 34D, launching NASA's Magellan space probe to Venus, Galileo to Jupiter, Ulysses to the sun, the Chandra X-ray Observatory, the original fleet of Tracking and Data Relay Satellites, plus many military spacecraft, including a few classified ones."


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Littlebit
post Apr 9 2007, 05:16 PM
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QUOTE (kwan3217 @ Apr 8 2007, 07:33 PM) *
Basically I want to see what a solid fuel motor looks like when it is fired in space. I suspect it is quite different from the billowing gray smoke we are used to seeing when one is lit in the atmosphere.

Good question. The solid propellants used are similar in composition to the ground-launched solids, but the nozzle is relatively longer - the motor is more efficient in a vacuum, and the turbulence much, much less - so the plume, if it could be seen, would still be 'gray' but not 'billowing'.
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