tater Posted February 17, 2020 Share Posted February 17, 2020 2 minutes ago, ThatGuyWithALongUsername said: It's too early for speculation, but to me it sounds like this was similar to CRS-16, or maybe the comms failed instead? Grid fins were working, though. Wonder what upper level winds were. Quote Link to comment Share on other sites More sharing options...
Ultimate Steve Posted February 17, 2020 Share Posted February 17, 2020 Unrelated to the most recent launch, but right now they are stacking two large pieces of SN1. Quote Link to comment Share on other sites More sharing options...
magnemoe Posted February 17, 2020 Share Posted February 17, 2020 4 minutes ago, Ultimate Steve said: I recall seeing something like that pop off on an earlier launch. Don't remember which one though. My guess is fabric insulation or heat protection for the engine compartment, Quote Link to comment Share on other sites More sharing options...
Wjolcz Posted February 17, 2020 Share Posted February 17, 2020 3 minutes ago, Ultimate Steve said: Unrelated to the most recent launch, but right now they are stacking two large pieces of SN1. Yussssssssss... Quote Link to comment Share on other sites More sharing options...
lajoswinkler Posted February 17, 2020 Share Posted February 17, 2020 (edited) 8 minutes ago, magnemoe said: My guess is fabric insulation or heat protection for the engine compartment, It clinged... You know what, it does look like it appeared like toothpaste. What if it's hydraulic liquid from the grid fin system? It would behave something like this in vacuum. edit: and with leaking hydraulic system, targeting becomes difficult, thus failure to pinpoint the barge... It's plausible. Edited February 17, 2020 by lajoswinkler Quote Link to comment Share on other sites More sharing options...
tater Posted February 17, 2020 Share Posted February 17, 2020 Wind maps show a decent jet stream above the landing zone. Wouldn't take a lot to have it miss by mere meters. Surface winds gusting from 20-30 knots in the landing area, too. Quote Link to comment Share on other sites More sharing options...
Ultimate Steve Posted February 17, 2020 Share Posted February 17, 2020 Update, they put the part of SN1 back down, they may try again later Quote Link to comment Share on other sites More sharing options...
Wjolcz Posted February 17, 2020 Share Posted February 17, 2020 (edited) 2 minutes ago, lajoswinkler said: It clinged... You know what, it does look like it appeared like toothpaste. What if it's hydraulic liquid from the grid fin system? It would behave something like this in vacuum. I'm thinking the same thing. But then it's kind of flexible like rubber or something. Edited February 17, 2020 by Wjolcz Quote Link to comment Share on other sites More sharing options...
Nightside Posted February 17, 2020 Share Posted February 17, 2020 Just now, lajoswinkler said: It clinged... You know what, it does look like it appeared like toothpaste. What if it's hydraulic liquid from the grid fin system? It would behave something like this in vacuum. It is so hard to get perspective on where that came from from that camera angle. Is it from the grid fins or the engine area? Can the hydraulic fluid freeze? Quote Link to comment Share on other sites More sharing options...
Ultimate Steve Posted February 17, 2020 Share Posted February 17, 2020 The SN1 section is being lifted again! Quote Link to comment Share on other sites More sharing options...
lajoswinkler Posted February 17, 2020 Share Posted February 17, 2020 Just now, Nightside said: It is so hard to get perspective on where that came from from that camera angle. Is it from the grid fins or the engine area? Can the hydraulic fluid freeze? Usually oils are used, so they aren't very volatile, but I have no idea which one these things use. If it leaks slowly, it could give off enough heat to turn pasty. Like this, only in weightlessness... Quote Link to comment Share on other sites More sharing options...
tater Posted February 17, 2020 Share Posted February 17, 2020 1 minute ago, Ultimate Steve said: The SN1 section is being lifted again! Quote Link to comment Share on other sites More sharing options...
Nightside Posted February 17, 2020 Share Posted February 17, 2020 Just now, lajoswinkler said: Usually oils are used, so they aren't very volatile, but I have no idea which one these things use. If it leaks slowly, it could give off enough heat to turn pasty. Like this, only in weightlessness... <delicious frosted waffle> mmmm. time for second breakfast. But wait, wouldn't frosting be an emulsion (entrained air)? Quote Link to comment Share on other sites More sharing options...
lajoswinkler Posted February 17, 2020 Share Posted February 17, 2020 Just now, Nightside said: mmmm. time for second breakfast. But wait, wouldn't frosting be an emulsion (entrained air)? I was going for the way it oozes out, it doesn't matter what it's made of. Yeah time to eat. LOL Quote Link to comment Share on other sites More sharing options...
tater Posted February 17, 2020 Share Posted February 17, 2020 Quote Link to comment Share on other sites More sharing options...
StrandedonEarth Posted February 17, 2020 Share Posted February 17, 2020 7 minutes ago, Nightside said: Can the hydraulic fluid freeze? Having experienced a burst hydraulic line on a forklift in a freezer, hydraulic fluid not intended for extreme cold will become the consistency of creamed honey in extreme cold. Hard to say if they would use specialized hydraulic fluid. They may not think it would be exposed to extreme cold for long enough, but there are cryogenics on board, so they may decide to err on the side of caution (a lesson learned the hard way many times by rocket engineers....) Quote Link to comment Share on other sites More sharing options...
cubinator Posted February 17, 2020 Share Posted February 17, 2020 13 minutes ago, Nightside said: It is so hard to get perspective on where that came from from that camera angle. Is it from the grid fins or the engine area? Can the hydraulic fluid freeze? I think it got pushed away by the thruster after a burst, so it seems to be on the grid fin side. Quote Link to comment Share on other sites More sharing options...
tater Posted February 17, 2020 Share Posted February 17, 2020 I don't think the ice is related. My bet is upper level winds. Quote Link to comment Share on other sites More sharing options...
Guest Posted February 17, 2020 Share Posted February 17, 2020 (edited) Always sad when a booster doesn’t stick the landing but on the plus side SN1 stacking looks much nicer than the previous crinkle aesthetic XD Edited February 17, 2020 by Guest Quote Link to comment Share on other sites More sharing options...
lajoswinkler Posted February 17, 2020 Share Posted February 17, 2020 1 hour ago, StrandedonEarth said: Having experienced a burst hydraulic line on a forklift in a freezer, hydraulic fluid not intended for extreme cold will become the consistency of creamed honey in extreme cold. Hard to say if they would use specialized hydraulic fluid. They may not think it would be exposed to extreme cold for long enough, but there are cryogenics on board, so they may decide to err on the side of caution (a lesson learned the hard way many times by rocket engineers....) As long as it flows and has negligible compressibility in working range, it's ok for hydraulics. For example materials with the consistency of lithium grease at room temperature - perfectly fine for force transmission. If you squeezed it through a crack into vacuum in free fall, it would get out like jagged snake, having some small degree of elasticity. That's why it reminded me of it. Quote Link to comment Share on other sites More sharing options...
tater Posted February 17, 2020 Share Posted February 17, 2020 Quote Link to comment Share on other sites More sharing options...
tater Posted February 17, 2020 Share Posted February 17, 2020 Windy landing area makes this unsurprising to me. Quote Link to comment Share on other sites More sharing options...
RealKerbal3x Posted February 17, 2020 Share Posted February 17, 2020 (edited) Sad, today's mission was going to make the milestone of 50 successful rocket landings, but the booster just decided to plunk itself in the ocean... Edited February 17, 2020 by RealKerbal3x Quote Link to comment Share on other sites More sharing options...
magnemoe Posted February 17, 2020 Share Posted February 17, 2020 Now this raises the issue on no abort system for manned starship. The primary issue is not launch even if both Falcon 9 fails was upper stage but landings and even that this would probably been an walk away landing on ground as they missed by 1-300 meters. That is for going to orbit, who is still an extreme sport. For P2P well starship probably need to be proven to be 1000 times safer than falcon 9 to start getting considered for approval as an airliner. For freight, well we have far more abort modes than the shuttle and you can add an kick stage to the 100 ton payload capacity. Hint an Falcon 9 second stage is 100 ton , launch cost will be a bit cheaper than falcon 9. Yes that will be like selling 100$ bills for 10$. Quote Link to comment Share on other sites More sharing options...
tater Posted February 17, 2020 Share Posted February 17, 2020 Given how cheap Starships could possibly be to build (Musk actually told Zubrin they could cost 5M$ each to build), reuse is not even important as a cargo vehicle to LEO. That's less than the retail cost of F9 fairings (Musk said fairings were 6M). Quote Link to comment Share on other sites More sharing options...
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