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#220
by
Tim S
on 25 May, 2010 04:19
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Deleted
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#221
by
Namechange User
on 25 May, 2010 04:25
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Deleted
I'm going to pick on this a bit.
This is exactly the problem. Too many in this industry want to draw lines where none should exist. This happens on both sides with SOME commercial folks thinking they are immune to anything and everything and can do more for fractions of a penny and the SOME government folks like to think that everyone else is incompitent and they are superior for some reason, even though the development track record says otherwise.
ALL rockets, all spacecraft, have problems now and then.
It is time people on both sides of the aisle grow up and work together and let go of the damn ideological extremes. Otherwise we're going nowhere and the future, whatever the hell that turns out to be, will never happen.
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#222
by
sdsds
on 25 May, 2010 04:30
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Frankly I really appreciate that the Delta MAP script can't get "go fever". Essentially the decision to hold at that point was made long ago by (presumably calm-headed) folk who considered what should be done in just this contingency.
So yes, I'd say this scrub is the sign of a great launch system, even if a particular piece of hardware wasn't ready to fly tonight.
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#223
by
Robotbeat
on 25 May, 2010 04:40
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Deleted
I'm going to pick on this a bit.
This is exactly the problem. Too many in this industry want to draw lines where none should exist. This happens on both sides with SOME commercial folks thinking they are immune to anything and everything and can do more for fractions of a penny and the SOME government folks like to think that everyone else is incompitent and they are superior for some reason, even though the development track record says otherwise.
ALL rockets, all spacecraft, have problems now and then.
It is time people on both sides of the aisle grow up and work together and let go of the damn ideological extremes. Otherwise we're going nowhere and the future, whatever the hell that turns out to be, will never happen.
Good post, OV.
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#224
by
WHAP
on 25 May, 2010 04:46
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Deleted
Almost as interesting as the last 15 seconds of tonights count...
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#225
by
Antares
on 25 May, 2010 04:50
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It took Shuttle 12 flights for an on-pad abort. Delta IV got to 13. And yet, somehow, I don't care. The ability to do the right thing up until the very last 1/25th of a second counts for a lot.
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#226
by
Jim
on 25 May, 2010 08:08
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From Larry who was at the Press Site: "There was a LARGE flame out from the H2 burnoff flame stack just before the HOLD, HOLD, HOLD call came through."
This sounds very similar to a Delta IV-Heavy abort I witnessed in January 2009 when a LARGE flame out of the H2 burnoff stack was seen followed immediately by a "HOLD, HOLD, HOLD" call.
Any thoughts?
EDIT: Obviously not a cause as Chris B has just posted the cause. But still, what could cause this "Flame out."
Once the topping has stopped and the tanks are secured for flight, all the trapped LH2 in the lines between the vehicle and supply tank has to be vented.
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#227
by
Jim
on 25 May, 2010 08:11
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Frankly I really appreciate that the Delta MAP script can't get "go fever". Essentially the decision to hold at that point was made long ago by (presumably calm-headed) folk who considered what should be done in just this contingency.
So yes, I'd say this scrub is the sign of a great launch system, even if a particular piece of hardware wasn't ready to fly tonight.
So this is just another point that there is nothing special to manrating since much of the same practices are used in unmanned systems.
And it is hypocritical of people who make disparaging comments about other programs when the center that they support is responsible for the death of 14 astronauts.
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#228
by
Ronsmytheiii
on 25 May, 2010 11:00
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Mobile Service tower has been moved back over the Delta IV
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#229
by
Chris Bergin
on 25 May, 2010 12:41
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Frankly I really appreciate that the Delta MAP script can't get "go fever". Essentially the decision to hold at that point was made long ago by (presumably calm-headed) folk who considered what should be done in just this contingency.
I like this post. Must take a really calm head to come over the loop and call the hold that late. I know it's training, but still.
Anyhoo, *might* start a new thread for the next attempt. Getting a bit convoluted on this one.
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#230
by
Jim
on 25 May, 2010 13:01
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Multithreaded Automatic Procedures System
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#231
by
ugordan
on 25 May, 2010 13:06
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I like this post. Must take a really calm head to come over the loop and call the hold that late.
Why, if it's an automatic cutoff and "all" he does is announce it to everyone else. It's not as if he himself initiated the hold, at least that's my impression.
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#232
by
robertross
on 25 May, 2010 15:14
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From Larry who was at the Press Site: "There was a LARGE flame out from the H2 burnoff flame stack just before the HOLD, HOLD, HOLD call came through."
This sounds very similar to a Delta IV-Heavy abort I witnessed in January 2009 when a LARGE flame out of the H2 burnoff stack was seen followed immediately by a "HOLD, HOLD, HOLD" call.
Any thoughts?
EDIT: Obviously not a cause as Chris B has just posted the cause. But still, what could cause this "Flame out."
Once the topping has stopped and the tanks are secured for flight, all the trapped LH2 in the lines between the vehicle and supply tank has to be vented.
Thanks Jim. Figured it was something 'like' a drainback of fluid lines, but in this case was just a final purge so there is no risk of fire or explosion from trapped gas.
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#233
by
Antares
on 25 May, 2010 22:09
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I like this post. Must take a really calm head to come over the loop and call the hold that late.
Why, if it's an automatic cutoff and "all" he does is announce it to everyone else. It's not as if he himself initiated the hold, at least that's my impression.
Correct. Chances are it was the person whose sole job is to
report an (automatic) MAPS hold. Now, another older rocket with a planetary on board and a Fill & Drain somewhere between open and closed at T-5s, that's another story.
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#234
by
Antares
on 25 May, 2010 22:14
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From Larry who was at the Press Site: "There was a LARGE flame out from the H2 burnoff flame stack just before the HOLD, HOLD, HOLD call came through."
This sounds very similar to a Delta IV-Heavy abort I witnessed in January 2009 when a LARGE flame out of the H2 burnoff stack was seen followed immediately by a "HOLD, HOLD, HOLD" call.
Any thoughts?
EDIT: Obviously not a cause as Chris B has just posted the cause. But still, what could cause this "Flame out."
Once the topping has stopped and the tanks are secured for flight, all the trapped LH2 in the lines between the vehicle and supply tank has to be vented.
Thanks Jim. Figured it was something 'like' a drainback of fluid lines, but in this case was just a final purge so there is no risk of fire or explosion from trapped gas.
Ed had it exactly right:
Sounds like gaseous hydrogen being vented immediately after an abort.
It goes like this:
Red line violated - script senses it - script starts initiating abort/safing commands including opening the fuel vent valves and depressurizing the tanks - fuel gas flows through the umbilicals into the vent stack and burns - human slower than computer calls HOLD.
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#235
by
Chris Bergin
on 26 May, 2010 13:25
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Atlantis is home, so Thursday, May 27 with a launch window of 11:00 – 11:19 p.m. EDT is on.
The launch broadcast will begin 10:35 p.m. EDT.
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#236
by
Chris Bergin
on 27 May, 2010 17:16
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Hope you all have your "no scrub" hats and coffee on standby for tonight
Will add in the scrub history to bring William's article up to date.
====
Cape Canaveral AFS, Fla., (May 27, 2010) - A United Launch Alliance Delta IV rocket with the Air Force’s Global Positioning System GPS IIF SV-1 (GPS IIF SV-1) satellite sits poised on its Space Launch Complex-37 launch pad ready to launch tonight. The launch is set for 11 p.m. EDT with the launch window extending until 11:19 p.m. EDT. The weather forecast calls for a 70 percent chance of acceptable weather during the launch window. GPS IIF SV-1 is the first in a series of next generation GPS satellites. Following its nearly three hour, 33 minute flight; it will join a worldwide timing and navigation system utilizing 24 satellites approximately 11,000 miles above the Earth’s surface. Photo by Pat Corkery, United Launch Alliance
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#237
by
Satori
on 27 May, 2010 18:08
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SLC-37B with Delta-IV at 1807UTC...
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#238
by
Satori
on 27 May, 2010 18:14
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Other view of the SLC-37B...
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#239
by
HIPAR
on 27 May, 2010 19:24
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What's the beehive building for?
