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#820
by
Gruff
on 26 Nov, 2009 18:15
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OK..I understand that "In the bucket" means the stack throttles back during maximum dynamic load, but where does this term come from?
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#821
by
Hungry4info3
on 26 Nov, 2009 18:20
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The shape of the graph of the throttle on the y-axis and time on the x-axis. Looks like a little bucket. ---_---
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#822
by
Gruff
on 26 Nov, 2009 18:28
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The shape of the graph of the throttle on the y-axis and time on the x-axis. Looks like a little bucket. ---_---
That makes perfect sense. Thanks Hungry.
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#823
by
Antares
on 26 Nov, 2009 19:47
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I'm really hoping someone can weigh in on the range of the sonic boom, asked here yesterday:
Think about it in terms of the shock wave (cone in this case) that causes the boom. You hear the boom when the shock wave passes over you. It is not propagating sound like most of what we hear.
So there will be a shock cone that moves along the track on that map with the point at where the orbiter is located. How far behind the orbiter the wave/cone impinges (and how wide that impingement line is) on the ground is obviously a function of altitude and Mach number (cone angle). So if you're too close to KSC where the orbiter is subsonic, you won't hear it. Similarly, if you're too far off the line, the cone will not impinge on the ground where you are.
That's my theoretical take on it.
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#824
by
oxford750
on 27 Nov, 2009 01:25
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Hi folks,
I have a number of questions with photos.
1) Where does this reflection of ISS come from?
Am I correct in thinking it comes from the camera they use to record the events on board?
2) Since these vent openings are on the nose (near the star tracker ports) are they closed for reentry? If not how come hot gases don't go in them?
3) What is this rescue sign for?
4) Why are some tiles "blacker" than others?
5) What are these "white lines" (they look like mose code) in downlinks from the shuttle?
6) What are these "smaller" connection on the T0 Ubilicals. I know the "bigger" ones are for the fuel that goes to the ET?
Also has anyone ever asked the crews if the orange suits are harder to put on/take off in spce or on the ground?
Thanks Oxford750
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#825
by
Jim
on 27 Nov, 2009 03:24
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Hi folks,
I have a number of questions with photos.
1) Where does this reflection of ISS come from?
2) Since these vent openings are on the nose (near the star tracker ports) are they closed for reentry? If not how come hot gases don't go in them?
3) What is this rescue sign for?
4) Why are some tiles "blacker" than others?
5) What are these "white lines" (they look like mose code) in downlinks from the shuttle?
6) What are these "smaller" connection on the T0 Ubilicals. I know the "bigger" ones are for the fuel that goes to the ET?
Also has anyone ever asked the crews if the orange suits are harder to put on/take off in spce or on the ground?
Thanks Oxford750
1. window or camera
2. yes, they are closed for entry
3. crash landing
4. age
5.
6. air conditioning, power, data, purge gases,
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#826
by
elmarko
on 27 Nov, 2009 08:28
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The white lines in the downlink video are, if I recall correctly, some kind of timecode or data stream.
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#827
by
oxford750
on 27 Nov, 2009 10:41
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Thanks folks.
In reguards(spell) to the RESCUE sign on the right side of the shuttle, I thought the only two escape routes where the hatch and/or the overhead windows on the flight deck.
Thanks again for the answers to my questions.
Oxford750
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#828
by
haywoodfloyd
on 27 Nov, 2009 12:13
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Can someone point me to the link for the shuttle Ground Track Network for Google Earth?
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#829
by
MikeMi.
on 27 Nov, 2009 13:21
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RCS engines are responsible for gettin proper orientation before re-entry (nose of shuttle goes up, angle 40) ??
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#830
by
Jim
on 27 Nov, 2009 13:24
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Thanks folks.
In reguards(spell) to the RESCUE sign on the right side of the shuttle, I thought the only two escape routes where the hatch and/or the overhead windows on the flight deck.
Thanks again for the answers to my questions.
Oxford750
The sign points to a handle to jettison the hatch.
There is also a sign on the right side on where to cut a hole in the orbiter for rescue
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#831
by
Jorge
on 27 Nov, 2009 16:05
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The white lines in the downlink video are, if I recall correctly, some kind of timecode or data stream.
They only appear in cameras externally plugged into the orbiter's video switching unit. The timecode is supposed to go in the vertical blank interrupt but it relies on a common sync provided by the VSU. An outside camera plugged in (e.g. camcorder) won't have that sync, so the timecode will appear to "crawl" across the screen.
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#832
by
Naito
on 27 Nov, 2009 16:11
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What is the source of the glow around the shuttle right around MECO from the ET cams? It's not all from the thrusters is it?
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#833
by
Danny Dot
on 27 Nov, 2009 16:38
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What is the source of the glow around the shuttle right around MECO from the ET cams? It's not all from the thrusters is it?
There is visible glow from the main engine plume. I think it might for some reason get worse during shut down, but I am not sure. Right after main engine shutdown, the down firing thrusters fire to get 4 feet/second velocity away from the tank. Then on most flights, the commander pushes on a control to command the aft thrusters to fire to move the orbiter along the tank so cameras on the orbiter can take pictures of the tank to look for foam shedding.
For further information, even later the commander pitches the orbiter up so they can take pictures of the tank from the overhead windows. This is the procedure General Bolden messed up on his first flight as a commander. He pitched too soon and they were WAY too close to the tank when it came into view. He said it was "impressive". He also says it was his fault, but it was really mine because I didn't train him as well as I should have.
He made it a point to announce to all of NASA he made a bad mistake that could have killed him and his crew. I asked him to give me at least part of the blame but he refused. Also, the call he got from mission control was not that good either and part of the blame was on their shoulders, but he didn't mention this either.
He is the right man to lead NASA. As a military leader and pilot, EVERYTHING that happens under your command is by definition your fault. General Bolden knows this and knows it well.
Danny Deger
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#834
by
brahmanknight
on 27 Nov, 2009 20:23
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I read that the slidewire baskets were considered for use with the on pad abort of sts 41D, but the controllers were afraid to have the astronauts use the untested escape system because it had never been tested with a human occupant.
Is there a reason why it was not tested with a human before the Challenger accident?
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#835
by
oxford750
on 27 Nov, 2009 21:29
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Thanks Jim.
Oxford750
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#836
by
Jim
on 27 Nov, 2009 22:09
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RCS engines are responsible for gettin proper orientation before re-entry (nose of shuttle goes up, angle 40) ??
yes
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#837
by
Danny Dot
on 28 Nov, 2009 04:53
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I read that the slidewire baskets were considered for use with the on pad abort of sts 41D, but the controllers were afraid to have the astronauts use the untested escape system because it had never been tested with a human occupant.
Is there a reason why it was not tested with a human before the Challenger accident?
I think it was because all the astronauts are terrified of heights
Seriously, I thought they were test early in the program, but I am not sure.
Danny Deger
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#838
by
rdale
on 28 Nov, 2009 13:18
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I think we have video of the slidewire being tested by a human (not an astro) on L2?
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#839
by
cd-slam
on 28 Nov, 2009 14:16
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I haven't seen the video, but I heard that the poor tech screamed all the way down.
As I understand, this system is designed to get the crew out of harm's way of an imminent explosion, hence made for speed not necessarily safety. It would never be considered for use during a normal abort.
