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#1760
by
psloss
on 10 Mar, 2011 20:50
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Since I believe there are parts of ascent where the only abort option is TAL, what would have been done if an engine failed during that time on STS-1? Would they have been within the ejection seat envelope at that time?
STS-1 was shaped to work without TAL.
IIRC, something like this was done again on STS-26, to reduce the "exposure" to TAL.
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#1761
by
Namechange User
on 10 Mar, 2011 21:06
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Question:
I saw a couple of years ago an article about Atlantis that said her retirement should be urged, because of a problem with her aging tanks(cryo tanks?). Can someone clarify that for me?
Thanks
I remember what you're talking about. They were helium tanks that were old, and spares were not available. One analysis found that they would burst before they leaked, which would be catastrophic. Another analysis found that they would leak before they burst. That's all I remember.
Additionally, the tanks are now pressurized in a stepped fashion to 80% and than up to 100%.
Which are the COPVs I was referring to
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#1762
by
Zoe
on 11 Mar, 2011 13:50
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Will there be a smaller than usual closeout crew for STS-135 considering there won't be anyone on the mid deck.
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#1763
by
JayP
on 11 Mar, 2011 14:12
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Since I believe there are parts of ascent where the only abort option is TAL, what would have been done if an engine failed during that time on STS-1? Would they have been within the ejection seat envelope at that time?
STS-1 was shaped to work without TAL.
And even so, an engine failure that forces a TAL abort does not equate to "eject right now". They would have gotten the vehicle thru re-entry and into a steady state glide and then ejected when the conditions were right.
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#1764
by
Danny Dot
on 11 Mar, 2011 16:51
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On the speed brake adjust. If I recall, close to landing the speed brake is set at one altitude then adjusted later. Both are done fairly low and are done automatically. Maybe someone else can confirm this.
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#1765
by
Danny Dot
on 11 Mar, 2011 17:01
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Since I believe there are parts of ascent where the only abort option is TAL, what would have been done if an engine failed during that time on STS-1? Would they have been within the ejection seat envelope at that time?
STS-1 was shaped to work without TAL.
And even so, an engine failure that forces a TAL abort does not equate to "eject right now". They would have gotten the vehicle thru re-entry and into a steady state glide and then ejected when the conditions were right.
I have never heard of a TAL that results in an ejection on the entry side. All TALs result in a landing. If TAL weather is bad, the launch is scrubed.
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#1766
by
racshot65
on 11 Mar, 2011 17:33
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I have a question from the STS 133 launch
What is drainback hold ?
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#1767
by
Namechange User
on 11 Mar, 2011 17:52
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I have a question from the STS 133 launch
What is drainback hold ?
Amount of LOX placed in the tank to give maximum performance without carrying "extra". Given LOX boils off, there is only "so long" (and it depends on the mission) that we can wait before we no longer have enough (with a slight margin) to meet the nominal and planned MECO.
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#1768
by
JayP
on 11 Mar, 2011 20:41
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Since I believe there are parts of ascent where the only abort option is TAL, what would have been done if an engine failed during that time on STS-1? Would they have been within the ejection seat envelope at that time?
STS-1 was shaped to work without TAL.
And even so, an engine failure that forces a TAL abort does not equate to "eject right now". They would have gotten the vehicle thru re-entry and into a steady state glide and then ejected when the conditions were right.
I have never heard of a TAL that results in an ejection on the entry side. All TALs result in a landing. If TAL weather is bad, the launch is scrubed.
True, but I was addressing his question about the ejection seat envelope. Theoreticaly, if there had been an abort on STS-1 between the RTLS and the AOA zones (I know Jim, they designed the ascent to avoid that condition) They would have ended up in gliding decent with no place to land. Then they would have ejected.
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#1769
by
mkirk
on 12 Mar, 2011 00:51
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On the speed brake adjust. If I recall, close to landing the speed brake is set at one altitude then adjusted later. Both are done fairly low and are done automatically. Maybe someone else can confirm this.
You are correct Danny, retract is at 3000 feet and adjust is at 500 feet. The "adjust" is at 500 feet because from a time perspective 500 occurs half between 3000 feet and touchdown.
Mark Kirkman
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#1770
by
iskyfly
on 13 Mar, 2011 00:51
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On the speed brake adjust. If I recall, close to landing the speed brake is set at one altitude then adjusted later. Both are done fairly low and are done automatically. Maybe someone else can confirm this.
You are correct Danny, retract is at 3000 feet and adjust is at 500 feet. The "adjust" is at 500 feet because from a time perspective 500 occurs half between 3000 feet and touchdown.
Mark Kirkman
thank you all who replied on this.
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#1771
by
iskyfly
on 13 Mar, 2011 00:54
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Here's a couple of papers I'm aware of covering the tile protuberance experiments (DTO 900):
thank you
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#1772
by
iskyfly
on 13 Mar, 2011 00:56
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PC 'ducer, not booster. PC means "chamber pressure" and 'ducer is short for transducer. Bias means the 'ducer is reading differently than it should.
I *think* the ducer in question returns psia, not psig, so it should have been reading around 14.7 since the nozzle was exposed to ambient pressure.
thank you
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#1773
by
Gary
on 13 Mar, 2011 13:14
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What's the bank angle of the shuttle in the HAC and is this variable dependant on energy levels?
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#1774
by
Danny Dot
on 13 Mar, 2011 15:45
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What's the bank angle of the shuttle in the HAC and is this variable dependant on energy levels?
It is about 45 degrees. The big variable is wind. Tail wind increases to angle while headwinds decrease the bank angle.
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#1775
by
Mark Dave
on 14 Mar, 2011 20:52
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Which mission had the OBSS used as part on an EVA?
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#1776
by
Jorge
on 14 Mar, 2011 21:05
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Which mission had the OBSS used as part on an EVA?
STS-121 (structural dynamics test to validate use of OBSS as an EVA platform)
STS-120 (P6 SAW blanket repair)
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#1777
by
TFGQ
on 15 Mar, 2011 17:06
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how do the sparklers when shoot the tail service masts
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#1778
by
rdale
on 15 Mar, 2011 17:10
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how do the sparklers when shoot the tail service masts
Try that one again, it didn't translate very well...
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#1779
by
TFGQ
on 15 Mar, 2011 17:12
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i am talking about the hydrogen burnoff system that is activated at
T-10 seconds