YNM Posted January 12, 2021 Share Posted January 12, 2021 1 hour ago, sevenperforce said: Superheavy still has to have the heaviest loads during boost when the tanks are under compression, so it has to be strong enough to support itself from the base for that reason. Yeah but you get all the extra ring stresses from the tank pressurization, which generates tension, which negates the compression. Pressurization and compression-tension is a different thing since we're talking about a tank skin that's used to store pressures inside larger than outside. Quote Link to comment Share on other sites More sharing options...
Flying dutchman Posted January 12, 2021 Share Posted January 12, 2021 Quote Link to comment Share on other sites More sharing options...
T-20000 Posted January 13, 2021 Share Posted January 13, 2021 Give it a little like plz! Quote Link to comment Share on other sites More sharing options...
Delta dart Posted January 13, 2021 Share Posted January 13, 2021 Sn9 is venting! Quote Link to comment Share on other sites More sharing options...
Clamp-o-Tron Posted January 13, 2021 Share Posted January 13, 2021 Likely scrub. Quote Link to comment Share on other sites More sharing options...
Delta dart Posted January 13, 2021 Share Posted January 13, 2021 It's still venting from the tri vents and we haven't seen the scrub vents activate. Just started up with the big main vents. Quote Link to comment Share on other sites More sharing options...
Flying dutchman Posted January 13, 2021 Share Posted January 13, 2021 (edited) Detanking Edit: possibly partial detank. Edited January 13, 2021 by Flying dutchman Quote Link to comment Share on other sites More sharing options...
T-20000 Posted January 13, 2021 Share Posted January 13, 2021 AWWWWW, SNAP! ABORT! Quote Link to comment Share on other sites More sharing options...
Flying dutchman Posted January 13, 2021 Share Posted January 13, 2021 Imho this could Just be posted in the SpaceX discussion thread.. Quote Link to comment Share on other sites More sharing options...
mikegarrison Posted January 13, 2021 Share Posted January 13, 2021 (edited) 18 hours ago, JoeSchmuckatelli said: Why do we pressurize with helium and not nitrogen? [edit] I didn't see that somebody else already provided the answer I was going to provide, about helium being a gas at much lower temperatures than nitrogen. Edited January 13, 2021 by mikegarrison Quote Link to comment Share on other sites More sharing options...
RCgothic Posted January 13, 2021 Share Posted January 13, 2021 In addition to the things other about helium people have mentioned, (low density, resistance to being a liquid, inert), probably the most important thing is that helium provides exceptional pressure per kg. The ideal gas law is PV=nRT. R is the ideal gas constant, so at similar T and V, P depends solely on "n", the number of atoms/molecules in the volume. Because helium gas has very low atomic weight, it has a very high "n" per kg, better than any other substance except hydrogen (which due to having diatomic molecules is not as ideal a gas). This means you need less mass of helium to pressurise a tank compared with pressurising it with another gas. High pressure per kg is such a key feature of rocket propellant pressurant. Quote Link to comment Share on other sites More sharing options...
RealKerbal3x Posted January 13, 2021 Share Posted January 13, 2021 Quote Link to comment Share on other sites More sharing options...
Gargamel Posted January 13, 2021 Share Posted January 13, 2021 12 hours ago, Flying dutchman said: Imho this could Just be posted in the SpaceX discussion thread.. And so it is. Overlapping threads have been merged Quote Link to comment Share on other sites More sharing options...
RealKerbal3x Posted January 13, 2021 Share Posted January 13, 2021 SN9 static fire stream: Quote Link to comment Share on other sites More sharing options...
Delta dart Posted January 13, 2021 Share Posted January 13, 2021 Successful static fire! They aren't depressing maybe another shot. Quote Link to comment Share on other sites More sharing options...
RealKerbal3x Posted January 13, 2021 Share Posted January 13, 2021 It just fired out of nowhere. No siren or anything. Cool GIF someone made: Quote Link to comment Share on other sites More sharing options...
Delta dart Posted January 13, 2021 Share Posted January 13, 2021 Hope this isn't another failure to detank and just a second attempt. Quote Link to comment Share on other sites More sharing options...
RealKerbal3x Posted January 13, 2021 Share Posted January 13, 2021 Quote Link to comment Share on other sites More sharing options...
RealKerbal3x Posted January 13, 2021 Share Posted January 13, 2021 (edited) Interesting! They're going for a second firing it seems! Edited January 13, 2021 by RealKerbal3x Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted January 13, 2021 Share Posted January 13, 2021 Just now, RealKerbal3x said: Interesting! Came here to post this. Very cool! This sort of rapid restart practice is essential. Quote Link to comment Share on other sites More sharing options...
RealKerbal3x Posted January 13, 2021 Share Posted January 13, 2021 Tank farm is going again! Quote Link to comment Share on other sites More sharing options...
RealKerbal3x Posted January 13, 2021 Share Posted January 13, 2021 And trivent! Siren! Quote Link to comment Share on other sites More sharing options...
Clamp-o-Tron Posted January 13, 2021 Share Posted January 13, 2021 Static fire! Second in just a couple hours! Everything looked like it went well. Quote Link to comment Share on other sites More sharing options...
RealKerbal3x Posted January 13, 2021 Share Posted January 13, 2021 2 static fires in one day! And that's a wrap, detank venting. Quote Link to comment Share on other sites More sharing options...
Flavio hc16 Posted January 13, 2021 Share Posted January 13, 2021 eh...i think they are going for the 3rd one guys Quote Link to comment Share on other sites More sharing options...
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