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#80
by
nathan.moeller
on 10 Sep, 2006 18:48
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Good NC3 burn to boost Atlantis' speed by 6.9 fps or 5 mph.
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#81
by
psloss
on 10 Sep, 2006 19:23
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JimO - 10/9/2006 12:22 PM
Apropos of the remark on the reliability of the OMS engine, I should point out that the flight control team for OMS/RCS for STS-1 and STS-2 included Gary Coen (Apollo vet, later flight director), plus novices Wayne Hale, Ron Dittemore, Billy Gerstenmeier, and..
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Jim Oberg ... 
Hey Jim,
You'll probably never see this page after it's buried by dozens of others, but can you run through your respective positions?
(This would be a good post for the historical forum.)
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#82
by
psloss
on 10 Sep, 2006 19:24
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Sounds like the crew is signing off for the day.
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#83
by
chksix
on 10 Sep, 2006 19:27
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I would have a hard time falling asleep in zero g. Everytime I dream I'm falling I wake up with a start here on earth. I've read that being in 0 g feels like hanging by your knees with your head down. Would be nice if we had some astronauts here to explain the feeling of spaceflight.
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#84
by
rcaron
on 10 Sep, 2006 19:50
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Anybody know what the issue is w/ the cabin feed having a horizontal black line? The line slowsly scrolls vertically (i.e. it creeps up the screen) and has white dashes of various lengths (reminded me initially of morse code, dit-dash!)
I seem to recall seeing this during STS-121 and the explanation being something about TDRS-Z not working so well. Could be wrong though, and my searches of the forum archives didn't turn up anything...
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#85
by
noname_77065
on 10 Sep, 2006 20:15
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I've seen that from time to time. I imagine it's something with the camcorder or the cables controlling the camcorder. I wouldn't think it's TDRS because there are plenty of other video sources from the shuttle and station that look perfectly fine.
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#86
by
Chris Bergin
on 10 Sep, 2006 20:29
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Flight Day 2 presentation to the MMT (overview) document now avaliable on L2.
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#87
by
Wisi
on 10 Sep, 2006 20:37
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chksix - 10/9/2006 9:14 PM
I would have a hard time falling asleep in zero g. Everytime I dream I'm falling I wake up with a start here on earth. I've read that being in 0 g feels like hanging by your knees with your head down. Would be nice if we had some astronauts here to explain the feeling of spaceflight.
Me too I would have problems, but because I would always think of the beautiful view outside I was missing ;-)
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#88
by
Wubbo
on 10 Sep, 2006 20:40
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A little late, but:
sbt - 10/9/2006 2:04 PM
b) Speedbrake Ch 3 transient degradation of driver output. The momentary degradation of driver outputs generated a force fight several times during ascent and after powered flight.
Rick
On reading this some questions came up:
- why are the speedbrake actuators operating at all during powered flight? Is the speedbrake used in the early launch phase for roll control?
- and why would the speedbrake actuators be moving *after* powered flight? Or would that be to move the brake to the center position?
Thanks,
GJ
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#89
by
Wubbo
on 10 Sep, 2006 20:41
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A little late, but:
sbt - 10/9/2006 2:04 PM
b) Speedbrake Ch 3 transient degradation of driver output. The momentary degradation of driver outputs generated a force fight several times during ascent and after powered flight.
Rick
On reading this some questions came up:
- why are the speedbrake actuators operating at all during powered flight? Is the speedbrake used in the early launch phase for roll control?
- and why would the speedbrake actuators be moving *after* powered flight? Or would that be to move the brake to the center position?
Thanks,
GJ
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#90
by
psloss
on 10 Sep, 2006 20:50
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FYI, PAO just noted that the post MMT briefing has been moved up one hour to 5 pm Eastern.
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#91
by
dutch courage
on 10 Sep, 2006 21:09
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Wubbo - 10/9/2006 10:28 PM
- why are the speedbrake actuators operating at all during powered flight? Is the speedbrake used in the early launch phase for roll control?
- and why would the speedbrake actuators be moving *after* powered flight? Or would that be to move the brake to the center position?
The speed brake/thrust controllers serve two distinct functions: during ascent, the pilot's speed brake/thrust controller may be used to vary the thrust level of the three SSMEs. During entry, the commander's or pilot's speed brake/thrust controller may be used to control aerodynamic drag (hence airspeed) by opening or closing the speed brake.
More details:
http://science.ksc.nasa.gov/shuttle/technology/sts-newsref/sts-rhc.html#sts-gnnc-brake
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#92
by
psloss
on 10 Sep, 2006 21:14
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dutch courage - 10/9/2006 4:56 PM
The speed brake/thrust controllers serve two distinct functions: during ascent, the pilot's speed brake/thrust controller may be used to vary the thrust level of the three SSMEs. During entry, the commander's or pilot's speed brake/thrust controller may be used to control aerodynamic drag (hence airspeed) by opening or closing the speed brake.
More details: http://science.ksc.nasa.gov/shuttle/technology/sts-newsref/sts-rhc.html#sts-gnnc-brake
Manual throttling is not done normally during ascent; it's likely not related to the reported problem.
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#93
by
dutch courage
on 10 Sep, 2006 21:34
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psloss - 10/9/2006 11:01 PM
Manual throttling is not done normally during ascent; it's likely not related to the reported problem.
I don't think the pilot would do this manualy but since he can the system would have been tested before launch. I don't know when the speedbrake became an issue?
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#94
by
psloss
on 10 Sep, 2006 21:35
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John Shannon showed a few of the ET umbilical camera images -- I assume these will be (or are) posted online by NASA. Two or three partial pieces of ice-frost ramps were shown and another little bit in the area where the LH2 PAL ramp was removed from this tank.
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#95
by
psloss
on 10 Sep, 2006 21:39
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dutch courage - 10/9/2006 5:21 PM
I don't think the pilot would do this manualy but since he can the system would have been tested before launch. I don't know when the speedbrake became an issue?
The point is that the issue is not related to the CDR or PLT hand controllers; John Shannon reported that it appears to be an electrical issue in that control channel.
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#96
by
dutch courage
on 10 Sep, 2006 21:52
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psloss - 10/9/2006 11:26 PM
The point is that the issue is not related to the CDR or PLT hand controllers; John Shannon reported that it appears to be an electrical issue in that control channel.
Yes I agree. I was answering the question why the speed brake would be used during powered flight.
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#97
by
psloss
on 10 Sep, 2006 21:58
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#98
by
psloss
on 10 Sep, 2006 22:09
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dutch courage - 10/9/2006 5:39 PM
Yes I agree. I was answering the question why the speed brake would be used during powered flight.
Since the hand controllers don't position the speed brake during powered flight (the flight control system is doing that automatically), that couldn't be the answer, though.
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#99
by
Chris Bergin
on 10 Sep, 2006 22:26
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Did I miss it, or did Shannon mention the damage to the starboard OMS that is being highlighted by sources?
