There are two frames of that video with the sides pushed out and no sign of fire (not visible nor light from a reflection). Then the next frame has the entire top of the building engulfed. Looks like a pressure release and then a fire unless the fire that caused the pressure increase is extremely well hidden for two whole frames.
Quote from: cohberg on 04/13/2023 06:41 pmhttps://twitter.com/torybruno/status/1646572389193625600Quote from: Tory Bruno @torybrunoOutside of the test rig/ stand. Test article is inside (you can’t see it). Hydrogen leak. H2 accumulated inside the rig. Found an ignition source. Burned fast. Over pressure caved in our forward dome and damaged the rig.Wow. Appreciate the transparency in releasing that video, lots of people were clamoring for it though. It does help reconcile how this could be considered a "minor" failure, if the violent explosion and most of the damage to the test stand/article was the result of accumulated leaking H2, and not the stage bursting due to structural failure. Edit: And apparently, they don't even know if the leak was from the test article or the GSE...https://twitter.com/torybruno/status/1646585104532381696
https://twitter.com/torybruno/status/1646572389193625600Quote from: Tory Bruno @torybrunoOutside of the test rig/ stand. Test article is inside (you can’t see it). Hydrogen leak. H2 accumulated inside the rig. Found an ignition source. Burned fast. Over pressure caved in our forward dome and damaged the rig.
Outside of the test rig/ stand. Test article is inside (you can’t see it). Hydrogen leak. H2 accumulated inside the rig. Found an ignition source. Burned fast. Over pressure caved in our forward dome and damaged the rig.
Quote from: lrk on 04/13/2023 07:01 pmQuote from: cohberg on 04/13/2023 06:41 pm*yeet tweet*Quote from: Tory Bruno @torybrunoOutside of the test rig/ stand. Test article is inside (you can’t see it). Hydrogen leak. H2 accumulated inside the rig. Found an ignition source. Burned fast. Over pressure caved in our forward dome and damaged the rig.Wow. Appreciate the transparency in releasing that video, lots of people were clamoring for it though. It does help reconcile how this could be considered a "minor" failure, if the violent explosion and most of the damage to the test stand/article was the result of accumulated leaking H2, and not the stage bursting due to structural failure. Edit: And apparently, they don't even know if the leak was from the test article or the GSE...*yeet tweet*Given indications from the video that the Centaur V structural test article exploded due to a hydrogen leak, is it possible that minor refinements are being made to the second stage of the Vulcan rocket slated to launch the Peregrine lunar lander to contain any hydrogen leak?
Quote from: cohberg on 04/13/2023 06:41 pm*yeet tweet*Quote from: Tory Bruno @torybrunoOutside of the test rig/ stand. Test article is inside (you can’t see it). Hydrogen leak. H2 accumulated inside the rig. Found an ignition source. Burned fast. Over pressure caved in our forward dome and damaged the rig.Wow. Appreciate the transparency in releasing that video, lots of people were clamoring for it though. It does help reconcile how this could be considered a "minor" failure, if the violent explosion and most of the damage to the test stand/article was the result of accumulated leaking H2, and not the stage bursting due to structural failure. Edit: And apparently, they don't even know if the leak was from the test article or the GSE...*yeet tweet*
*yeet tweet*Quote from: Tory Bruno @torybrunoOutside of the test rig/ stand. Test article is inside (you can’t see it). Hydrogen leak. H2 accumulated inside the rig. Found an ignition source. Burned fast. Over pressure caved in our forward dome and damaged the rig.
Given indications from the video that the Centaur V structural test article exploded due to a hydrogen leak, is it possible that minor refinements are being made to the second stage of the Vulcan rocket slated to launch the Peregrine lunar lander to contain any hydrogen leak?
Quote from: Vahe231991 on 04/13/2023 08:18 pmGiven indications from the video that the Centaur V structural test article exploded due to a hydrogen leak, is it possible that minor refinements are being made to the second stage of the Vulcan rocket slated to launch the Peregrine lunar lander to contain any hydrogen leak?No. Nothing will be done to it until they know the cause. The leak could have been the test set up. The Cert-1 vehicle has been tanked a couple of times with LH2. They would have known if there was a leak.
Wow. Appreciate the transparency in releasing that video, lots of people were clamoring for it though. It does help reconcile how this could be considered a "minor" failure, if the violent explosion and most of the damage to the test stand/article was the result of accumulated leaking H2, and not the stage bursting due to structural failure. Edit: And apparently, they don't even know if the leak was from the test article or the GSE...
Interesting statement by Tory Bruno:https://twitter.com/torybruno/status/1646593698480943104I realize that this might be a bit of a misstatement by him, but does this mean that all Centaur V testing is done or all Vulcan Centaur qualification testing is complete?
Source of H2 leak? Has it been determined if Centaur test article or GSE?
Not yet
How would you go about working out the source? Assuming the blast destroyed most of the evidence to where the source was
Because it was a deflagration (fire) not a detonation, the cylinder is buckled but intact and the dome pieces are large and lying inside the tank. If the leak was in the test article, we’ll find it.
So after you figure the leak out can you redo the test at say Stennis or will you have to wait to rebuild this test stand ?
Got through 14 tests before this one. May not need a full Centaur to finish
If that is true, then it means that BE-4 qualification has been successfully completed.
Quote from: Robert_the_Doll on 04/14/2023 03:25 amIf that is true, then it means that BE-4 qualification has been successfully completed.No, that is an ambiguous implied antecedent. "everything else" may be the rest of the Centaur tests or the rest of the Vulcan Centaur tests. I think it's just the Centaur tests, because if the BE-4 qual was completed ULA and/or BO would make an announcement.
I keep hearing "Advanced Upper Stage" vis-a-vis Centaur V. Can someone here please define "Advanced Upper Stage"?
Quote from: SoftwareDude on 04/14/2023 09:30 pmI keep hearing "Advanced Upper Stage" vis-a-vis Centaur V. Can someone here please define "Advanced Upper Stage"?I think that "Advanced Upper Stage" you mention refers to the Advanced Cryogenic Evolved Stage, because that upper stage was the ancestral design for what is now the Centaur V.
