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#2140
by
saturnapollo
on 14 Aug, 2011 22:31
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Mark
You are not comparing like with like. These are on opposite sides of the orbiters. It was perhaps decided that there should be a bigger space before the capital U for aesthetic purposes. It might even be a rule used by printers.
Keith
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#2141
by
DaveS
on 14 Aug, 2011 22:56
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Can someone remind of the difference(s) between an IPR and a PR?
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#2142
by
Mark Dave
on 15 Aug, 2011 00:20
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I apologies for that. Thanks for clearing up my question there.
On my Challenger question please. Are there such pre launch photos of the 51L stack before launch?
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#2143
by
Jim
on 15 Aug, 2011 00:59
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Can someone remind of the difference(s) between an IPR and a PR?
They are the same. one is just interim.
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#2144
by
10W29
on 15 Aug, 2011 01:22
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Can someone remind of the difference(s) between an IPR and a PR?
They are the same. one is just interim.
Not at all. Generally, a PR is a discrepancy taken against a known component, which then can be resolved (i.e. a broken wire). An IPR is a discrepancy in which the cause has not been isolated (i.e. the valve didn't open when commanded) to one component. Usually troubleshooting is required to isolate the problem, at which time the IPR would be upgraded to a PR. At least that was the way it used to be done . . .
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#2145
by
Specifically-Impulsive
on 15 Aug, 2011 01:30
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My other question is are there any pre flight photos of Challenger on STS-51L?
Google NASA Image Exchange and then search on that page (NIX) for Challenger. You'll get plenty of pictures but not hi res.
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#2146
by
Jim
on 15 Aug, 2011 02:16
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Can someone remind of the difference(s) between an IPR and a PR?
They are the same. one is just interim.
Not at all. Generally, a PR is a discrepancy taken against a known component, which then can be resolved (i.e. a broken wire). An IPR is a discrepancy in which the cause has not been isolated (i.e. the valve didn't open when commanded) to one component. Usually troubleshooting is required to isolate the problem, at which time the IPR would be upgraded to a PR. At least that was the way it used to be done . . .
When one becomes the other, they are the same.
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#2147
by
wolfpack
on 15 Aug, 2011 17:38
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I understand that Columbia was some 8,000 lbs heavier than her sister ships. Exactly where was this extra weight and what was it made up of (ie - airframe, engine mounts, etc)? Did she have extra hardware that the other orbiters did not?
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#2148
by
jnc
on 15 Aug, 2011 17:46
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I understand that Columbia was some 8,000 lbs heavier than her sister ships. Exactly where was this extra weight and what was it made up of (ie - airframe, engine mounts, etc)? Did she have extra hardware that the other orbiters did not?
Columbia, as the first orbiter, had extra diagnostic gear (e.g. strain gauges) built into her, which her later sisters lacked. That, plus the wiring to connect them up, etc was part of the extra weight. More details
here.
Noel
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#2149
by
Ronsmytheiii
on 15 Aug, 2011 17:58
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Plus Columbia has extra tiles on her wing chines and tail that were covered with thermal blankets on other orbiters. Not much difference, but the tiles did weigh more than the blankets
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#2150
by
Jim
on 15 Aug, 2011 19:48
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I understand that Columbia was some 8,000 lbs heavier than her sister ships. Exactly where was this extra weight and what was it made up of (ie - airframe, engine mounts, etc)? Did she have extra hardware that the other orbiters did not?
The structure (mostly wings)was made stronger than was needed
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#2151
by
gfagley
on 15 Aug, 2011 20:28
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How come the flag on the side of Endeavour is closer to the United States logo than on Discovery?
there is more space between letters on Endeavour than on Discovery.
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#2152
by
Mark Dave
on 15 Aug, 2011 20:33
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I see.
On the Challenger question. I did look, but mostly all I found are crew training and launch photos, as well as the destruction of the vehicle. Nothing pre launch of the vehicle, save for the one photo of the ice on the FSS. I only saw one pre launch photo, and that was on a video about the disaster.
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#2153
by
10W29
on 15 Aug, 2011 22:09
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Can someone remind of the difference(s) between an IPR and a PR?
They are the same. one is just interim.
Not at all. Generally, a PR is a discrepancy taken against a known component, which then can be resolved (i.e. a broken wire). An IPR is a discrepancy in which the cause has not been isolated (i.e. the valve didn't open when commanded) to one component. Usually troubleshooting is required to isolate the problem, at which time the IPR would be upgraded to a PR. At least that was the way it used to be done . . .
When one becomes the other, they are the same.
The original question asked for the differences, not the similarities.
Not all IPR's became PR's and the vast majority if PR's did not start off as IPR's.
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#2154
by
spacecane
on 16 Aug, 2011 00:05
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#2155
by
subisnack
on 16 Aug, 2011 00:16
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I believe what you are referring to is one of the star tracker doors.
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#2156
by
Lee Jay
on 16 Aug, 2011 00:17
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#2157
by
Namechange User
on 16 Aug, 2011 00:29
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Star tracker, I think.
Yes.
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#2158
by
jnc
on 16 Aug, 2011 03:23
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Plus Columbia has extra tiles on her wing chines and tail that were covered with thermal blankets on other orbiters. Not much difference, but the tiles did weigh more than the blankets
A fair number of the tiles on Columbia's upper side were replaced with thermal blankets during one of her refurbishments (for weight savings purposes), not sure if that included those areas.
Noel
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#2159
by
Ronsmytheiii
on 16 Aug, 2011 03:41
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A fair number of the tiles on Columbia's upper side were replaced with thermal blankets during one of her refurbishments (for weight savings purposes), not sure if that included those areas.
Noel
The chine areas remained covered with extra black tiles for her entire life, and extra black tiles were added in support of the SILTS experiment on the tail after STS-9. Columbia did replace areas of her LRSI tiles with AFRSI, but the distinctive HRSI chines were never replaced.
But of course the spars and test equipment were the main contributors to her extra weight. Attached an image of Columbia rolling out for STS-107 to shot the tail and chines still covered in HRSI.
