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#1780
by
Namechange User
on 15 Mar, 2011 17:16
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But there is no question or at least people aren't understanding.
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#1781
by
Jim
on 15 Mar, 2011 17:49
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i am talking about the hydrogen burnoff system that is activated at
T-10 seconds
They are pyrotechnics (fireworks).
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#1782
by
TFGQ
on 15 Mar, 2011 17:50
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how are they produced
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#1783
by
Namechange User
on 15 Mar, 2011 17:56
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how are they produced
pyros.
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#1784
by
JayP
on 15 Mar, 2011 18:53
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how are they produced
pyros.
Yeah, Basically a roman candle with no delay between the stars.
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#1785
by
DMeader
on 15 Mar, 2011 21:40
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Are there any closeup photos of the actual hardware and installation? All I've ever seen is them burning.
(can you imagine having one of those to set off in your backyard on July 4?)
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#1786
by
Mark Dave
on 15 Mar, 2011 23:41
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That would be cool seeing some detail of the HBS (hydrogen burn off system) on the MLP. I've been curious about those and how they work.
You're right DMeader, one awesome display for fireworks.
What do they use anyway? The same material as sparklers or something else?
I noticed in some videos there are four of these that go off prior to SME start. the two directly below the engines and two more at the back end of each TSM.
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#1787
by
JayP
on 16 Mar, 2011 00:04
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What do they use anyway? The same material as sparklers or something else?
I don't know exactly what they use in these, but the stars used in most fireworks are mostly potassium perchlorate as a combusting agent mixed with a binding agent and various salts for color.
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#1788
by
ChrisGebhardt
on 16 Mar, 2011 00:17
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I have a question from the STS 133 launch
What is drainback hold ?
Scroll on back a few pages in this very thread for a detailed answer to this question when it was asked right after the launch of STS-133.
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#1789
by
psloss
on 16 Mar, 2011 01:30
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I have a question from the STS 133 launch
What is drainback hold ?
Scroll on back a few pages in this very thread for a detailed answer to this question when it was asked right after the launch of STS-133.
IMO, the best answer on this was referred to in those posts a few pages back, which was Mark's (mkirk):
http://forum.nasaspaceflight.com/index.php?topic=625.msg23596#msg23596The frightening thing is that was five years ago and it doesn't seem that long ago.
And it's still complicated enough (particularly with these station rendezvous windows) that I had to have it explained to me (yet again) when I asked about it during the mission. (Name dropping omitted.
)
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#1790
by
AnalogMan
on 16 Mar, 2011 10:55
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What do they use anyway? The same material as sparklers or something else?
I don't know exactly what they use in these, but the stars used in most fireworks are mostly potassium perchlorate as a combusting agent mixed with a binding agent and various salts for color.
Found this small snippet in a tech report during a quick search:
"A ROFI is, in effect, a small rocket motor filled with zirconium pellets. These pellets flood the area between the SSME nozzles and the duct entrance with small (550-micron), extremely hot zirconium sparklers."
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#1791
by
gomorrha
on 16 Mar, 2011 12:37
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What would happen to the Shuttle if it were in space for more than 30 days undocked to the ISS or some other external power source?
Just discussing this question with a friend of mine because we´ve heard, that the Soyoz TMA-M can stay in space for up to 1 year.
We´re just interested in what happens to the shuttle (we assume no staff on board).
Thanks!
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#1792
by
rdale
on 16 Mar, 2011 12:41
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It would run out of power and shut down.
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#1793
by
gomorrha
on 16 Mar, 2011 12:57
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I think that's been asked before. the limiting docked time for the shuttle is the ability of the fuel cells to provide power. Shutting them down and running all shuttle systems from SSPTS is not an option so eventually your fuel cells run out of a power.
So if the shuttle is complete out of power is there also the radiation cooling (payload bay) affected?
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#1794
by
Sesquipedalian
on 17 Mar, 2011 00:23
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Has the shuttle ever done a FD4 rendezvous to the ISS?
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#1795
by
Jorge
on 17 Mar, 2011 00:42
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Has the shuttle ever done a FD4 rendezvous to the ISS?
Yes, on STS-88 (Node 1 installation on the ODS required the extra day).
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#1796
by
Jorge
on 17 Mar, 2011 00:45
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I think that's been asked before. the limiting docked time for the shuttle is the ability of the fuel cells to provide power. Shutting them down and running all shuttle systems from SSPTS is not an option so eventually your fuel cells run out of a power.
So if the shuttle is complete out of power is there also the radiation cooling (payload bay) affected?
Yes, with no power the Freon pumps and heat exchangers cannot run, so no circulation through the radiators.
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#1797
by
Aobrien
on 17 Mar, 2011 01:07
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Not shuttle directly but what is the bay in the back of the VAB used for. I know it had Saturn V's roll out of it in years past I believe but not sure now. Thanks
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#1798
by
Jim
on 17 Mar, 2011 01:13
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Not shuttle directly but what is the bay in the back of the VAB used for. I know it had Saturn V's roll out of it in years past I believe but not sure now. Thanks
that is where the ET's are processed and a contingency shelter for a shuttle stack
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#1799
by
JayP
on 17 Mar, 2011 02:31
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Not shuttle directly but what is the bay in the back of the VAB used for. I know it had Saturn V's roll out of it in years past I believe but not sure now. Thanks
that is where the ET's are processed and a contingency shelter for a shuttle stack
FYI, high bay 2 was only used for stacking a vehicle once, for SA-513 (the Skylab station). While they were stacking it, high bay 1 was occupied by Apollo 17 and high bay 3 by ML-1 that was being modified for the Saturn IB. High bay 4 was never used for stacking a vehicle, but they have used it at times for horizontal storage of an orbiter.
)