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#420
by
ChrisGebhardt
on 21 Jan, 2011 13:57
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Looking at photos of yesterdays DIV-H launch... immediately after liftoff it can be seen that the foam on one side of all three first stage cores is burned black, and near the top of one booster it is still actively on fire. Is this not a problem?
It's not desirable, but it's not a "problem" per se.
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#421
by
kevin-rf
on 22 Jan, 2011 03:01
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How does one keep the soot from the charing from penetrating the payload shroud?
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#422
by
sdsds
on 22 Jan, 2011 08:08
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Positive pressure, like for any clean room environment? Who would want that dirty outside air getting inside, regardless of whether it contains a bit of soot?
Face reality: the main reason to avoid having your rocket set itself on fire is simply because outside observers don't like to see that happen.
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#423
by
Jim
on 22 Jan, 2011 12:36
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How does one keep the soot from the charing from penetrating the payload shroud?
The air is leaving the fairing as it climbs
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#424
by
Jim
on 22 Jan, 2011 12:37
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Positive pressure, like for any clean room
There isn't any added
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#425
by
Antares
on 22 Jan, 2011 15:59
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They actually had a significant redesign of the vents after Heavy Demo to prevent ingestion of free H2 and combustion products.
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#426
by
DMeader
on 22 Jan, 2011 16:37
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Face reality: the main reason to avoid having your rocket set itself on fire is simply because outside observers don't like to see that happen.
Well, this "outside observer" thought it was a reasonable question.
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#427
by
Ronsmytheiii
on 23 Jan, 2011 00:26
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They actually had a significant redesign of the vents after Heavy Demo to prevent ingestion of free H2 and combustion products.
Didnt the pad have this problem during the shuttle era, preventing its use?
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#428
by
Jim
on 23 Jan, 2011 00:29
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They actually had a significant redesign of the vents after Heavy Demo to prevent ingestion of free H2 and combustion products.
Didnt the pad have this problem during the shuttle era, preventing its use?
He was referring to vents on the vehicle
The "problem" was fixed
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#429
by
mdo
on 25 Jan, 2011 16:24
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In case, would they do anything about the charred insulation after a pad abort?
Does the black surface (reduced albedo) impact thermal conditioning of cryo tanks in a subsequent launch attempt?
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#430
by
Jim
on 25 Jan, 2011 16:48
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In case, would they do anything about the charred insulation after a pad abort?
Does the black surface (reduced albedo) impact thermal conditioning of cryo tanks in a subsequent launch attempt?
No, the first D-IV flew as is after an FRF.
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#431
by
mdo
on 25 Jan, 2011 16:55
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In case, would they do anything about the charred insulation after a pad abort?
Does the black surface (reduced albedo) impact thermal conditioning of cryo tanks in a subsequent launch attempt?
No, the first D-IV flew as is after an FRF.
FRF supposedly means Flight Readiness Firing.
Very well. Thanks.
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#432
by
Namechange User
on 25 Jan, 2011 16:59
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In case, would they do anything about the charred insulation after a pad abort?
Does the black surface (reduced albedo) impact thermal conditioning of cryo tanks in a subsequent launch attempt?
No, the first D-IV flew as is after an FRF.
"What's a 'furf'?"
LOL, guess the movie kids!
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#433
by
Propforce
on 25 Jan, 2011 17:00
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They actually had a significant redesign of the vents after Heavy Demo to prevent ingestion of free H2 and combustion products.
Didnt the pad have this problem during the shuttle era, preventing its use?
He was referring to vents on the vehicle
The "problem" was fixed
I recalled that there was a 'strong' concern regarding to the exhaust duct at SLC 6 to safely funnel the rocket plume exhausts away from the Shuttle. At the time, turbojet engines were used to provide suction power to draw the exhaust plumes away, but there were enough concerns voiced at the time. Even before the Challenger, the work began to slow down and many were laid off. The Challenger accident made it officially shut down the launch pad.
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#434
by
Propforce
on 25 Jan, 2011 17:00
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In case, would they do anything about the charred insulation after a pad abort?
Does the black surface (reduced albedo) impact thermal conditioning of cryo tanks in a subsequent launch attempt?
No, the first D-IV flew as is after an FRF.
"What's a 'furf'?"
LOL, guess the movie kids!
FRF = Flight Readiness Firing
But I recalled that was only a 1 second hot fire on the pad with the vehicle hold down bolts engaged.
The first DIV-H flight was when most were surprised at the amount of gH2 flames engulfing the vehicle. Someone told me that they had to call Range Safety to assure them this is 'normal' for this vehicle and DO NOT PUSH THE DESTRUCT BUTTON !!!
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#435
by
Namechange User
on 25 Jan, 2011 17:03
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In case, would they do anything about the charred insulation after a pad abort?
Does the black surface (reduced albedo) impact thermal conditioning of cryo tanks in a subsequent launch attempt?
No, the first D-IV flew as is after an FRF.
"What's a 'furf'?"
LOL, guess the movie kids!
FRF = Flight Readiness Firing
Yeah, I know....
But take a shot at what movie the above quoute came from.....just some fun and games instead of the "seriousness" around here all the time.
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#436
by
Propforce
on 25 Jan, 2011 17:08
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In case, would they do anything about the charred insulation after a pad abort?
Does the black surface (reduced albedo) impact thermal conditioning of cryo tanks in a subsequent launch attempt?
No, the first D-IV flew as is after an FRF.
"What's a 'furf'?"
LOL, guess the movie kids!
FRF = Flight Readiness Firing
Yeah, I know....
But take a shot at what movie the above quoute came from.....just some fun and games instead of the "seriousness" around here all the time.
Oh sorry, didn't realize that was a joke. I guess we're just a bunch of serious nerds here !
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#437
by
ugordan
on 25 Jan, 2011 17:13
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But I recalled that was only a 1 second hot fire on the pad with the vehicle hold down bolts engaged.
By the time the engine reached full thrust, there was no free H2 being vented anymore. It could have been 10 seconds, wouldn't have made much difference. The FRF day also looks like it was somewhat windy and the vehicle wasn't really charred - at least the side I see in a LQ video.
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#438
by
Antares
on 25 Jan, 2011 17:19
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Strictly speaking LOX hydrogen engines run rich of stoichiometric, so there's plenty of free hydrogen in the plume at any time.
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#439
by
ugordan
on 25 Jan, 2011 17:24
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Yes, but strictly speaking it's being thrown out the flame trench and actually sucking in the air above the engine in the process.
