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#360
by
Chris Bergin
on 05 Feb, 2006 14:02
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#361
by
psloss
on 05 Feb, 2006 14:12
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Based on my foggy recollection of the STS-37 video, my guess is that is a long-exposure image. It's similar to other "breakup" re-entries, some tragic.
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#362
by
Stardust9906
on 05 Feb, 2006 15:25
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psloss - 5/2/2006 2:25 PM
Heather - 5/2/2006 7:40 AM
Hello, been a guest here for a long time. Great site.
I have a question. You know the ET is the one part of the Shuttle that isn't reused, has anyone got video or images of it burning up after being seperated? I've only seen images of it falling away. How long until it starts to burn up and how long does it take? Is there nothing left, or do some parts still splash into the ocean?
There is video of some ET re-entries on a few low-inclination, direct-insertion launches (I believe). If I recall correctly, I saw ET breakup video broadcast on CNN from the STS-41C launch and also amateur video on the STS-37 launch from I think Maui.
Philip Sloss
I found a couple of photo's of the STS-41C tank re-entry at
http://satobs.org/re-entry.html
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#363
by
Flightstar
on 05 Feb, 2006 18:58
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I don't think there's a video of an ET breakup taken from the orbiter, I would like to see one if it exsists.
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#364
by
HKS
on 07 Feb, 2006 12:03
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Two questions... Is there any words on how results were after the repair techniques on shuttle RCC panels and tiles preformed in space on STS-114? Is NASA going to test new procedures on STS-121?
What decides witch launchpad to use on KSC? STS-114 used 39B, and STS-121 is also going to use 39B, when will 39A be used?
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#365
by
anik
on 07 Feb, 2006 16:25
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HKS - 7/2/2006 4:03 PM
Is there any words on how results were after the repair techniques on shuttle RCC panels and tiles preformed in space on STS-114?
I saw only this preliminary test results in "NASA Space Station On-Orbit Status 30 July 2005":
"The TPS DTO activities in the Shuttle payload bay began at ~6:45am and extended thru 8:16am EDT. [Preliminary test results: The NOAX (Non-Oxide Adhesive eXperimental) demo on the RCC porosity sample showed some swelling after its application to cracks. When smoothed out with the spatula tool, swelling persisted, estimated by the EV crew at 1/32 of an inch. When applied to gouges, bubbling of 1/16 inch was observed in the NOAX. The material was hard to shape inside the gouge and tended to want to come out, or roll right off of the spatula. The temperature of the test sample was recorded to be 6.7 deg C. Testing with the sample planned for later arcjet testing on the ground had to be rescheduled due to falling behind in the EVA timeline. The EW (Emittance Wash) application was performed on two different tile samples. Some evidence of minor bubbling was detected. The EW material was described as carbonated at first when coming out of the gun, however this effect quickly ceased. The material was applied directly in the body of the tile damage crevices with the gun applicator and with a foam brush tool used to coat the edges of the tile damage.]"
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#366
by
mkirk
on 07 Feb, 2006 17:02
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HKS - 7/2/2006 7:03 AM
What decides witch launchpad to use on KSC? STS-114 used 39B, and STS-121 is also going to use 39B, when will 39A be used?
Right now Pad A is udergoing a maintenance down period. They have been repainting the structures, they removed the rest of the overhead crane from the Fixed Service Structure and so on...The plan (as I last understood it) is to bring Pad A on line late this year/early next year and then it will be Pad B's trun for maintenance. I believe they will actually use this time to begin modifications to PAD B to support the CLV. This means that PAD A will support the rest of the STS schedule.
Mark
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#367
by
DaveS
on 08 Feb, 2006 09:51
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Can someone tell me what these circles around the SRB nosecone is? I know that those in a square pattern is the forward Booster Seperation Motors(BSMs), but what about the others?
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#368
by
HKS
on 08 Feb, 2006 11:37
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How long time do they need in the OPF from an orbiter lands untill it can roll over to the VAB and get mated with a new stack?
And, why do they need several weeks on the launch-pad before launching?
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#369
by
mkirk
on 08 Feb, 2006 18:19
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DaveS - 8/2/2006 4:51 AM
Can someone tell me what these circles around the SRB nosecone is? I know that those in a square pattern is the forward Booster Seperation Motors(BSMs), but what about the others?
Those are static pressure ports similar to what you would find on an airplane. They are used for the altitude sensing system during recovery.
Mark
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#370
by
SimonShuttle
on 09 Feb, 2006 13:39
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The SRBs always seem to seperate very much together in the way they come away from the ET. They also appear to be still firing for a good 10-15 seconds after seperation. How is this timed? Always at a set time, or a set point of ascent, or at a set point of remaining propellant?
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#371
by
Jim
on 09 Feb, 2006 13:58
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SimonShuttle - 9/2/2006 8:39 AM
The SRBs always seem to seperate very much together in the way they come away from the ET. They also appear to be still firing for a good 10-15 seconds after seperation. How is this timed? Always at a set time, or a set point of ascent, or at a set point of remaining propellant?
When the chamber pressure is less than 50psi. There is residual propellant still burning but providing less thrust than the weight of the casings. There is occasional chuffing even when under chute.
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#372
by
Mark Max Q
on 09 Feb, 2006 14:13
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I didn't know that. Thanks!
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#373
by
dmc6960
on 09 Feb, 2006 20:09
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When the shuttle airlock (or Quest airlock on ISS) decompresses, does it just vent the atmosphere out into space, or is there a vacuum pump that recovers as much air as feasibly possible? I've recently gotten the impression that it is just vented out into space.
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#374
by
Jim
on 09 Feb, 2006 20:11
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shuttle airlock vents into space
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#375
by
Davie OPF
on 09 Feb, 2006 22:40
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Jim - 9/2/2006 3:11 PM
shuttle airlock vents into space
Yes. There should be images of how it is exposed from STS-114 on orbit operations via some threads here.
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#376
by
dmc6960
on 10 Feb, 2006 02:49
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Are there technical/mass/power/complication issues why they dont try to save as much air as possible? Or to they have plenty with them to not care?
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#377
by
Jim
on 10 Feb, 2006 04:43
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On shuttle, they have plenty of air. There is a pump in the Quest airlock on the ISS
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#378
by
Rob in KC
on 13 Feb, 2006 17:46
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Can someone explain why the Orbiter uses APUs, as opposed to heavy duty batteries?
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#379
by
Jim
on 13 Feb, 2006 18:00
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Rob in KC - 13/2/2006 12:46 PM
Can someone explain why the Orbiter uses APUs, as opposed to heavy duty batteries?
Power density. At the time, APU was the highest and cheapest power density (hp/lb) available. The SRB's use the same system but they are call HPU's. Titan's SRMU's used a solid cartridge powered HPU's
Most launch vehicles power their hydraulics from a power takeoff on the engine turbopowers. Shuttle doesnt have this luxury during entry. So an alternative source was required.