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#980
by
ddunham
on 22 Feb, 2010 19:17
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Search the shuttle Q&A thread
Any good tips for that? On the previous question about the graphic I felt certain there should be some old posts with the answer, but after about 10 minutes of searching I hadn't found anything I could refer to. So I just posted what's probably a redundant answer.
Wondering what all the elements of that graphic are were some of my first questions when I was watching missions. I wish I knew of an easier resource to point at (or a way to create one).
--
Darren
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#981
by
Jim
on 22 Feb, 2010 19:28
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Search the shuttle Q&A thread
Any good tips for that? On the previous question about the graphic I felt certain there should be some old posts with the answer, but after about 10 minutes of searching I hadn't found anything I could refer to. So I just posted what's probably a redundant answer.
Wondering what all the elements of that graphic are were some of my first questions when I was watching missions. I wish I knew of an easier resource to point at (or a way to create one).
--
Darren
http://forum.nasaspaceflight.com/index.php?topic=6156.msg203875#msg203875The brackets in the orbital trace indication orbital sunrise and sunset.
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#982
by
elmarko
on 23 Feb, 2010 08:29
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SAA is South Atlantic Anomaly, to start you off. You'll probably find some more if you search for that, and then see when the question has come up etc,
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#983
by
ChrisGebhardt
on 23 Feb, 2010 22:49
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OK, you have a point -- except for the last launch, after which there won't be any more SRB's used. One would have to think that the "R&D" element value would be diluted to nearly nothing at this point, having examined so many SRB's in the past.
If 133 remains the last flight, its SRBs will be recovered to reveal any problems that may affect its LON rescue flight, 335.
If 135 is baselined, or if 335 must be launched, you have a point. Barely.
Acutally, one of the weight saving items of interest for STS-133 was to eliminate the recovery assets of the SRBs.
Now, last I saw this was still under consideration. Has this been firmly decided against? I haven't seen anything since all the Cat-I weight savings objectives were incorporated into the mission's baseline.
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#984
by
mdo
on 24 Feb, 2010 16:49
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What is the advantage of 3G throttling over shutting down one engine a little earlier?
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#985
by
Lee Jay
on 24 Feb, 2010 17:02
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What is the advantage of 3G throttling over shutting down one engine a little earlier?
With throttling you still have attitude control with all the engines, you don't have step changes to your guidance system caused by the shut down and you preserve your full engine out capability.
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#986
by
mdo
on 24 Feb, 2010 18:49
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What is the advantage of 3G throttling over shutting down one engine a little earlier?
With throttling you
1. still have attitude control with all the engines,
2. you don't have step changes to your guidance system caused by the shut down and
3. you preserve your full engine out capability.
It all seems to boil down to redundancy (3.) although I don't know what step changes in the guidance system (2.) are about. Attitude control (1.) and step changes (2.), or the lack thereof, can apparently be dealt with in the event of a single engine failure (STS-51F). Throttling comes with its own failure modes (STS-3) and one would expect reduced fuel efficiency and therefore performance margins.
Anyway, it is not my intention to challenge throttling the way it is. Thanks for the insight.
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#987
by
Jim
on 24 Feb, 2010 18:59
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or the lack thereof, can apparently be dealt with in the event of a single engine failure (STS-51F).
Not true. Intentionally running on two engines would not be the same as running on two engines after the 3rd failed.
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#988
by
shuttlefan
on 01 Mar, 2010 13:08
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Were the SSMEs ever run at the theoretical 109% of full thrust during an actual ascent?
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#989
by
mkirk
on 01 Mar, 2010 13:12
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No! 104.5% is the highest power level ever used in flight.
Mark Kirkman
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#990
by
steveS
on 03 Mar, 2010 02:59
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Why NASA decided STS-133's (planned last mission) duration to be only 8 days.
1. Discovery has SSTP and can tap into station power - Hence can stay longer in the space station?
2. Due to no more flights (or may be STS-135) isnt it better to do more science and experiments by staying more?. Some unique things they can do with the shuttle will be lost foreever.
3. Crew will have more time for transfers from the PMM to the ISS (and hence PMM can carry more equipement?)
4. What will have the largest impact if 8 days is to be changed to say 13 days?
5. May be more time in space means high risk of space debris problem? Is this the only reason why it is planned as a 8 day mission?
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#991
by
cd-slam
on 03 Mar, 2010 04:00
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Why NASA decided STS-133's (planned last mission) duration to be only 8 days.
1. Discovery has SSTP and can tap into station power - Hence can stay longer in the space station?
2. Due to no more flights (or may be STS-135) isnt it better to do more science and experiments by staying more?. Some unique things they can do with the shuttle will be lost foreever.
3. Crew will have more time for transfers from the PMM to the ISS (and hence PMM can carry more equipement?)
4. What will have the largest impact if 8 days is to be changed to say 13 days?
5. May be more time in space means high risk of space debris problem? Is this the only reason why it is planned as a 8 day mission?
This mission will be different than the usual logistics mission, because the PMM will be left on board the station and is not returned to the shuttle's payload bay. Hence the ISS crew will be able to unload it at their leisure.
Instead the limitation on this flight will be the mass which can be carried to orbit. Each astronaut requires daily resources of air, water, food, etc which have to be carried up in the shuttle, thus any reduction in mission time (and crew size) translates to more cargo which can be carried in the PMM and on board the shuttle.
The fact the mission is shortened to 8 days gives you some idea of the desperation to get cargo to the station.
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#992
by
steveS
on 05 Mar, 2010 06:37
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What is the MPLM that Atlantis is supposed to carry for STS-133 LON mission? Is it Rafaello? When will the processing of the MPLM will begun? (Read some where that although Donatello is the most advanced, it would stay in the ground ! )
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#993
by
Robson68
on 05 Mar, 2010 16:32
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Is it possible to produce a blended thermal protection system instead of using tiles.
Could this not then be fitted to the shuttles?. I know pending fleet retirement but would this be possible.
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#994
by
Jim
on 05 Mar, 2010 20:28
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Is it possible to produce a blended thermal protection system instead of using tiles.
Could this not then be fitted to the shuttles?. I know pending fleet retirement but would this be possible.
It is "blended". Tiles transition to blankets.
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#995
by
AnalogMan
on 06 Mar, 2010 00:19
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Is it possible to produce a blended thermal protection system instead of using tiles.
Could this not then be fitted to the shuttles?. I know pending fleet retirement but would this be possible.
It is "blended". Tiles transition to blankets.
Blankets & Tiles (from STS-130 RPM):
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#996
by
ChrisGebhardt
on 06 Mar, 2010 02:41
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1.What is the MPLM that Atlantis is supposed to carry for STS-133 LON mission? Is it Rafaello?
2.When will the processing of the MPLM will begun?
3.(Read some where that although Donatello is the most advanced, it would stay in the ground ! )
1. Yes, Raffaello.
2. Already underway in some fashion.
3. Yes. Dontello is "most advanced" in that is can hold powered payloads; and yes, it will not fly.
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#997
by
dafixer
on 06 Mar, 2010 11:19
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I was watching NASAtv 2 nights ago and happened onto the middle of a NASA "music video" showing multiple SRB separations and ET drops, all set to music. It looked like it was a short movie showing the entire launch sequence and ending when the Orbiter reached orbit.
Does anybody have any idea what this movie is called? I'd love to see it in it's entirety. I just caught the last couple of minutes...
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#998
by
Cog_in_the_machine
on 06 Mar, 2010 11:31
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#999
by
dafixer
on 06 Mar, 2010 11:47
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