kerbiloid Posted February 21, 2023 Share Posted February 21, 2023 3 hours ago, tater said: In almost exactly the same place? (a few cm farther way from that racetrack on MS-22). 1. In videogames, when projectiles are hitting the same place on the wall, there is probably a non-character projectile spawner shooting along the same path every time. 2. When a corpse with a hole is found, they usually check the wound channel with something like a glass pencil, also to estimate the trajectory, Conclusion: it would be nice to put a laser pointer into the hole with back end, and see, where it shows. Maybe there is a spawner sitting over there. Quote Link to comment Share on other sites More sharing options...
tater Posted February 21, 2023 Author Share Posted February 21, 2023 Quote Link to comment Share on other sites More sharing options...
darthgently Posted February 21, 2023 Share Posted February 21, 2023 Just now, tater said: That is a lot of ammonia leakage if ammonia is the coolant and it leaked. The color matches what one would expect from ammonia leakage from what I've been reading Quote Link to comment Share on other sites More sharing options...
tater Posted February 21, 2023 Author Share Posted February 21, 2023 2 minutes ago, darthgently said: That is a lot of ammonia leakage if ammonia is the coolant and it leaked. The color matches what one would expect from ammonia leakage from what I've been reading If it has happened before, what are the chances it's not an impact, but some sort of fundamental issue with the structure? Quote Link to comment Share on other sites More sharing options...
darthgently Posted February 21, 2023 Share Posted February 21, 2023 (edited) 23 minutes ago, tater said: If it has happened before, what are the chances it's not an impact, but some sort of fundamental issue with the structure? I'm going to venture the possibility that sometimes, because of errors or engineering changes, holes need to be brazed/filled now and then. And the material used is not up to the task given corrosiveness of ammonia and orbital temperature and pressure extremes. Maybe. Just looking at locations of staining seem to be at braze/weld points in these photos where a similar material may have been used. Edited February 21, 2023 by darthgently Quote Link to comment Share on other sites More sharing options...
DDE Posted February 21, 2023 Share Posted February 21, 2023 (edited) 49 minutes ago, darthgently said: That is a lot of ammonia leakage if ammonia is the coolant It's not. Isooctane is. 54 minutes ago, tater said: Important context: Katya's source dismisses it as residue from fairing sep and RCS motors. Edited February 21, 2023 by DDE Quote Link to comment Share on other sites More sharing options...
RCgothic Posted February 21, 2023 Share Posted February 21, 2023 At the supposed point of impact on Progress, there's also a lump visible on Soyuz. Quote Link to comment Share on other sites More sharing options...
Codraroll Posted February 21, 2023 Share Posted February 21, 2023 Similar damages to very similar parts of similar craft, in the same general area as each other. The odds of micrometeorites being so selective with their points of impact (and they have all of the ISS to hit, of which the two docked Russian craft comprise roughly a percent of the surface area) seem abysmally small. Could it be damage from fairing separation sending pieces of shrapnel to the same general area every time? Or a rough surface on whatever clamps are used to lift the craft into place for transport/assembly? Because it really seems that something is punching holes in roughly the same area of these craft. Or, well, "holes", maybe just pits, until thermal cycling cause them to finally break through. And as somebody chillingly pointed out in the comments section of the ArsTechnica article on the story, Soyuz MS-23 was loaded with hypergolic propellant before Progress MS-21 started to leak. If the leak was caused by a process on the ground, or related to the integration of the craft somehow, it may not have been discovered before MS-23 had been through most of it already. Before the same thing happened to MS-21, the story was a micrometeorite strike, after all, so they may not have taken any precautions regarding other failure modes. And it's not like a Soyuz can be drained of hypergolics while they go over it an extra time. Apparently, it's a "point of no return", "use it or lose it" milestone in the assembly process. Worst-case scenario, they might have bricked MS-23 before they could find the flaw. Well, now at least they know where to look for it. Quote Link to comment Share on other sites More sharing options...
tater Posted February 21, 2023 Author Share Posted February 21, 2023 32 minutes ago, Codraroll said: Similar damages to very similar parts of similar craft, in the same general area as each other. The odds of micrometeorites being so selective with their points of impact (and they have all of the ISS to hit, of which the two docked Russian craft comprise roughly a percent of the surface area) seem abysmally small. Could it be damage from fairing separation sending pieces of shrapnel to the same general area every time? Or a rough surface on whatever clamps are used to lift the craft into place for transport/assembly? Because it really seems that something is punching holes in roughly the same area of these craft. Or, well, "holes", maybe just pits, until thermal cycling cause them to finally break through. And as somebody chillingly pointed out in the comments section of the ArsTechnica article on the story, Soyuz MS-23 was loaded with hypergolic propellant before Progress MS-21 started to leak. If the leak was caused by a process on the ground, or related to the integration of the craft somehow, it may not have been discovered before MS-23 had been through most of it already. Before the same thing happened to MS-21, the story was a micrometeorite strike, after all, so they may not have taken any precautions regarding other failure modes. And it's not like a Soyuz can be drained of hypergolics while they go over it an extra time. Apparently, it's a "point of no return", "use it or lose it" milestone in the assembly process. Worst-case scenario, they might have bricked MS-23 before they could find the flaw. Well, now at least they know where to look for it. Metal quality issue, and degradation after XX days on orbit? (or Y solar cycles) Quote Link to comment Share on other sites More sharing options...
DDE Posted February 22, 2023 Share Posted February 22, 2023 5 hours ago, Codraroll said: Could it be damage from fairing separation sending pieces of shrapnel to the same general area every time? Or a rough surface on whatever clamps are used to lift the craft into place for transport/assembly? Because it really seems that something is punching holes in roughly the same area of these craft. Or, well, "holes", maybe just pits, until thermal cycling cause them to finally break through. Still have to account for the MMOD-like ejecta ring on MS-22. 8 hours ago, RCgothic said: At the supposed point of impact on Progress, there's also a lump visible on Soyuz. Importantly, going back to the unflipped image without the perception-distorting effects of the circle, it looks like a paint defect rather than any sort of damage. Although it could as well be accukulation of liquid under a layer of textile. Or spalling from the shock of an MMOD impact. Quote Link to comment Share on other sites More sharing options...
DDE Posted February 22, 2023 Share Posted February 22, 2023 Interesting input from Mikhail Kotov. Apparently the Russian ISS modules use, and both Soyuz and Progress ships may freely use, an alternative coolant that is a mixture of several polymethylsiloxanes. https://t.me/space78125/1578 It's not clear what determines which liquid gets poured in. Quote Link to comment Share on other sites More sharing options...
DDE Posted February 23, 2023 Share Posted February 23, 2023 A mission patch for a mission with no humans involved. https://t.me/roscosmos_gk/8565 Quote Link to comment Share on other sites More sharing options...
Minmus Taster Posted February 24, 2023 Share Posted February 24, 2023 (edited) MS-23 is off to the ISS, lets hope it returns a little less empty: Edited February 24, 2023 by Minmus Taster Typo :P Quote Link to comment Share on other sites More sharing options...
DDE Posted February 25, 2023 Share Posted February 25, 2023 Docking at 04:01 MSK https://t.me/roscosmos_gk/8589 So that by the time the bosses wake up they've already fled over the Canadian border /s Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted February 25, 2023 Share Posted February 25, 2023 (edited) First of all, they should make a screenshot of the radiator panel. Before somebody again makes a shot. Edited February 25, 2023 by kerbiloid Quote Link to comment Share on other sites More sharing options...
tater Posted February 26, 2023 Author Share Posted February 26, 2023 Quote Link to comment Share on other sites More sharing options...
tater Posted February 26, 2023 Author Share Posted February 26, 2023 Almost docked Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted February 26, 2023 Share Posted February 26, 2023 https://www.rbc.ru/rbcfreenews/63fb1dd09a794709aed1078f Done. (video). Quote Link to comment Share on other sites More sharing options...
DDE Posted February 28, 2023 Share Posted February 28, 2023 Powerpoint, 2016 Autodesk, 2021 And that's a positive outcome by the standards of this thread Quote Link to comment Share on other sites More sharing options...
DDE Posted March 7, 2023 Share Posted March 7, 2023 Roscosmos posts a new trailer for Challenge, thinking no-one will notice the release has slid back from April 12 to April 20. https://t.me/roscosmos_gk/8686 Quote Link to comment Share on other sites More sharing options...
DDE Posted March 7, 2023 Share Posted March 7, 2023 (February 5) Quote Link to comment Share on other sites More sharing options...
DDE Posted March 13, 2023 Share Posted March 13, 2023 Proton-M/Olymp-K, launch nominal, snooper on its way to GSO. https://t.me/roscosmos_gk/8748 They're using a slightly newer "Luch-5X" cover designation. Quote Link to comment Share on other sites More sharing options...
DDE Posted March 22, 2023 Share Posted March 22, 2023 Yeehaw? Quote Link to comment Share on other sites More sharing options...
Scotius Posted March 22, 2023 Share Posted March 22, 2023 Very rustic. Is there even any semi-official head cover for kosmonauts? NASA guys and gals seem to prefer baseball caps. Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted March 22, 2023 Share Posted March 22, 2023 (edited) The highest density of info per minute is in her youtubes about ISS things, with quick disassembling/reassembling in situ. *** Also, they've tested a space helicopter. Spoiler (Maybe, is not embeddable, so https://www.youtube.com/watch?v=i5P2jvlyKLw) Edited March 22, 2023 by kerbiloid Quote Link to comment Share on other sites More sharing options...
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