Frida Space Posted June 28, 2015 Share Posted June 28, 2015 There was an overpressure event in the upper stage liquid oxygen tank. Data suggests counterintuitive cause(source: elon musk twitter) Link to comment Share on other sites More sharing options...
EladDv Posted June 28, 2015 Share Posted June 28, 2015 There was an overpressure event in the upper stage liquid oxygen tank. Data suggests counterintuitive cause.ninja'd Link to comment Share on other sites More sharing options...
Frida Space Posted June 28, 2015 Share Posted June 28, 2015 Still have to find the cause, obviously, but that was quick. Another reason to love SpaceX Link to comment Share on other sites More sharing options...
StrandedonEarth Posted June 28, 2015 Share Posted June 28, 2015 There was an overpressure event in the upper stage liquid oxygen tank. Data suggests counterintuitive cause(source: elon musk twitter)Stuck pressure relief valve? Or something trying to crash through the tank from above? (looking at you, IDA) Link to comment Share on other sites More sharing options...
Rainbow-Dashie Posted June 28, 2015 Share Posted June 28, 2015 Can we plz dig out the Space Shuttles from the back room Link to comment Share on other sites More sharing options...
Loligoat Posted June 28, 2015 Share Posted June 28, 2015 Wow, glad I wasn't the only one who had a bad feeling about this one.I have family over this weekend, it was a lovely morning. We were all sitting on the porch until I brought everyone in to watch the launch in the living room. I thought it was stage sep at first, until the rocket stopped existing. My heart just dropped. We all just sat and stared at the screen for a few minutes. Link to comment Share on other sites More sharing options...
CptRichardson Posted June 28, 2015 Share Posted June 28, 2015 Overpressure event? What, like a docking collar compressing LOX? Link to comment Share on other sites More sharing options...
YNM Posted June 28, 2015 Share Posted June 28, 2015 (edited) So there's something dented the tin can ? (well no blame fest but I hope it clears the RUD better than most of us in our saves). IMO as there's no possibility an LOX tank can overpressure without external feed (take to open air and you get boiloff instead), must be structural collapse. Edited June 28, 2015 by YNM Link to comment Share on other sites More sharing options...
tater Posted June 28, 2015 Share Posted June 28, 2015 Counterintuitive... a stuck valve is what you might expect. What about cargo at X gs impinging on the tank, crushing it? Link to comment Share on other sites More sharing options...
LordFerret Posted June 28, 2015 Share Posted June 28, 2015 "Space Launch Complex 40, Cape Canaveral, Florida, Earth"Really. lol Link to comment Share on other sites More sharing options...
codepoet Posted June 28, 2015 Share Posted June 28, 2015 I am interested in that also has the telemetry data onscreen. Notice how the velocity continues to increase throughout the event (although perhaps at a reduced rate) until the dragon shaped object appears to separate when it stays constant. Is this perhaps consistent with the telemetry coming from dragon and showing it coming away as the trunk / second stage disintegrates and the the first stage keeps on trucking? Link to comment Share on other sites More sharing options...
Dunrana Posted June 28, 2015 Share Posted June 28, 2015 in which case the second explosion was probablly the falcon 9 lower stage piling into dragon Link to comment Share on other sites More sharing options...
Tankman101 Posted June 28, 2015 Share Posted June 28, 2015 They're obviously planning for the future, how else will future generations know that it isn't on mars! Link to comment Share on other sites More sharing options...
EladDv Posted June 28, 2015 Share Posted June 28, 2015 how can the cargo OVER PRESSURIZE the tank enough to make it burst? Link to comment Share on other sites More sharing options...
sojourner Posted June 28, 2015 Share Posted June 28, 2015 The second explosion was the FTS being activated. Link to comment Share on other sites More sharing options...
Wingman703 Posted June 28, 2015 Share Posted June 28, 2015 I would suspect the stop in K/ph is more indicative of loss of signal, note how the altitude meter also stops. Link to comment Share on other sites More sharing options...
tater Posted June 28, 2015 Share Posted June 28, 2015 Cargo (IDA) breaks free, crushes LOX tank (is it at the top of the stack?). As tank crushes, overpressure, then rupture. RUD/FTS. Link to comment Share on other sites More sharing options...
Dispatcher Posted June 28, 2015 Share Posted June 28, 2015 "Space Launch Complex 40, Cape Canaveral, Florida, Earth"Really. lolOf course, we still use the "nation" component of an address; in this case "USA". Link to comment Share on other sites More sharing options...
Shpaget Posted June 28, 2015 Share Posted June 28, 2015 Counterintuitive... a stuck valve is what you might expect. What about cargo at X gs impinging on the tank, crushing it?Cargo (IDA) breaks free, crushes LOX tank (is it at the top of the stack?). As tank crushes, overpressure, then rupture. RUD/FTS.But the overpressure safety valve should still release the excess pressure. Link to comment Share on other sites More sharing options...
sojourner Posted June 28, 2015 Share Posted June 28, 2015 Cargo breaking loose is really the "best case scenario" here. I don't think it will be that convenient. Link to comment Share on other sites More sharing options...
tater Posted June 28, 2015 Share Posted June 28, 2015 But the overpressure safety valve should still release the excess pressure.When the cargo detaches and hits the tank at 4-5 gs, crushing it?Actually, before the event you can see a streamer coming off the upper stage... maybe it is doing just that. Link to comment Share on other sites More sharing options...
skyace65 Posted June 28, 2015 Share Posted June 28, 2015 If the dev notes this week aren't the "stop letting Jeb fly" edition I'm going to be severely disappointed Link to comment Share on other sites More sharing options...
YNM Posted June 28, 2015 Share Posted June 28, 2015 But the overpressure safety valve should still release the excess pressure.Would be more basis for an abort, less deltaV in any way.how can the cargo OVER PRESSURIZE the tank enough to make it burst?Beat a pressurized aerosol can very hard - don't blame me if it hurts you, by exploding. Link to comment Share on other sites More sharing options...
AlbertKermin Posted June 28, 2015 Share Posted June 28, 2015 From what Elon Musk just tweeted, it looks like the second-stage LOX tank had an over- pressure event with a "counter-intuitive cause".So much for my speculation. (Though, to be fair, if it was one of my KSP missions, that would have been the cause) Sounds to me like the rocket accidentally vented too much LOX, lowering the pressure and causing the remaining LOX to evaporate too rapidly for the vents to keep up with. Upper stage blows in half, and 9 Merlin engines drive the Dragon right down through the remaining stack, disintegrating everything. Link to comment Share on other sites More sharing options...
Moon Goddess Posted June 28, 2015 Share Posted June 28, 2015 So there's something dented the tin can ? (well no blame fest but I hope it clears the RUD better than most of us in our saves). IMO as there's no possibility an LOX tank can overpressure without external feed (take to open air and you get boiloff instead), must be structural collapse.Failure of both the overpressure valve and failure of a cooling creating a boiloff thus liquid turning to gas that takes up more volume sounds could overpressure without an outside source. Link to comment Share on other sites More sharing options...
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