tater Posted September 27, 2021 Share Posted September 27, 2021 11 minutes ago, pmborg said: Yes true 133 client satelites plus 10 starlinks A lot of sats to be sure, but way smaller than the starlinks (a bunch of volume used for the dispensers). Quote Link to comment Share on other sites More sharing options...
tater Posted September 27, 2021 Share Posted September 27, 2021 Quote Link to comment Share on other sites More sharing options...
Beccab Posted September 27, 2021 Share Posted September 27, 2021 Exactly 2 years ago, MK1 was stacked! It looks so ugly compared to today's starship, and a huge progress has been made Quote Link to comment Share on other sites More sharing options...
Beccab Posted September 27, 2021 Share Posted September 27, 2021 The sheriff is at the road closure, the pad is being cleared and the S20 hatches are closed or being closed. It's testing time! Quote Link to comment Share on other sites More sharing options...
Minmus Taster Posted September 27, 2021 Share Posted September 27, 2021 44 minutes ago, Beccab said: The sheriff is at the road closure, the pad is being cleared and the S20 hatches are closed or being closed. It's testing time! It's time. Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted September 27, 2021 Share Posted September 27, 2021 Mildly off-topic -- my ex moved our kids to a house without internet service (long story lol) so I promptly ordered Starlink for them. It says they are targeting mid to late 2021 for this service area (rural Virginia) which I believe ought to be now. Has anyone else used Starlink or does anyone else have an idea of what the turnaround time is like? Quote Link to comment Share on other sites More sharing options...
tater Posted September 27, 2021 Share Posted September 27, 2021 I'm at 35° latitude (~DC) and have heard nothing from them yet. Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted September 27, 2021 Share Posted September 27, 2021 1 hour ago, sevenperforce said: Has anyone else used Starlink or does anyone else have an idea of what the turnaround time is like? Placed order in Feb, got it about a month ago, 48°N. Seems kinda random when people are getting theirs. Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted September 27, 2021 Share Posted September 27, 2021 I think that's supposed to be headER tank... Quote Link to comment Share on other sites More sharing options...
GearsNSuch Posted September 28, 2021 Share Posted September 28, 2021 (edited) 39 minutes ago, CatastrophicFailure said: I think that's supposed to be headER tank... Gotta love the COVID warning on the second tweet. What would be the drag impact on ascent of scales vs. tiles? I’d guess scales would be a good bit more turbulent… Edited September 28, 2021 by GearsNSuch Quote Link to comment Share on other sites More sharing options...
Guest The Doodling Astronaut Posted September 28, 2021 Share Posted September 28, 2021 Feels great to take break from difficult homework and see testing is back and alive! Quote Link to comment Share on other sites More sharing options...
JoeSchmuckatelli Posted September 28, 2021 Share Posted September 28, 2021 (edited) 2 hours ago, GearsNSuch said: What would be the drag impact on ascent of scales vs. tiles? I’d guess scales would be a good bit more turbulent I'm interested in this as well - but I would think that a correct shape of scale would be less turbulent (c.f. Fish & Sharks). Speedo invented (a now banned) swimwear line for competitive swimmers which dramatically reduced drag, including features that mimicked the dermal denticles (scale like structures) found on sharks. While hexes are simple and break up the flow of plasma effectively - scale structures could improve or reduce drag and provide similar plasma protection https://news.harvard.edu/gazette/story/2018/02/in-aerodynamic-performance-sharkskin-model-offers-more-lift-less-drag/ Edited September 28, 2021 by JoeSchmuckatelli Quote Link to comment Share on other sites More sharing options...
cubinator Posted September 28, 2021 Share Posted September 28, 2021 6 minutes ago, JoeSchmuckatelli said: I'm interested in this as well - but I would think that a correct shape of scale would be less turbulent (c.f. Fish & Sharks). Speedo invented (a now banned) swimwear line for competitive swimmers which dramatically reduced drag, including features that mimicked the dermal denticles (scale like structures) found on sharks. While hexes are simple and break up the flow of plasma effectively - scale structures could improve or reduce drag and provide similar plasma protection Fish don't swim at hypersonic speed, though. It might be a different challenge. Quote Link to comment Share on other sites More sharing options...
JoeSchmuckatelli Posted September 28, 2021 Share Posted September 28, 2021 5 minutes ago, cubinator said: Fish don't swim at hypersonic speed, though. It might be a different challenge Sounds like a good time to engage @mikegarrison-whether standard plane skin / shape must be modified for supersonic / hypersonic flight. Of particular interest is the Harvard researchers' discovery that not only do the shapes improve drag, they increase lift. I know overall craft shape has been modified to enable supersonic flight - but has anyone looked at whether a modified skin is beneficial for super/hyper-sonic flight? Quote Link to comment Share on other sites More sharing options...
tater Posted September 28, 2021 Share Posted September 28, 2021 Presumably a static fire. Quote Link to comment Share on other sites More sharing options...
mikegarrison Posted September 28, 2021 Share Posted September 28, 2021 14 minutes ago, JoeSchmuckatelli said: Sounds like a good time to engage @mikegarrison-whether standard plane skin / shape must be modified for supersonic / hypersonic flight. Of particular interest is the Harvard researchers' discovery that not only do the shapes improve drag, they increase lift. I know overall craft shape has been modified to enable supersonic flight - but has anyone looked at whether a modified skin is beneficial for super/hyper-sonic flight? I discussed this before, in the Airplane Q&A thread. The word you want to search on is "riblets", although Airbus does like to call it "shark skin". Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted September 28, 2021 Share Posted September 28, 2021 44 minutes ago, JoeSchmuckatelli said: While hexes are simple and break up the flow of plasma effectively - scale structures could improve or reduce drag and provide similar plasma protection Air drag gets a lot of conversational real estate in this thread, but keep in mind, it’s a bit of a lesser concern vs airplanes. After the first couple of minutes of flight it ceases to be a concern at all, really. A rocket only needs to be aerodynamic enough, obsessing over minimizing every tiny bit of drag loss quickly becomes a diminishing return. If you’ve ever seen a closeup of the shuttle ET, or even an Atlas V, the surface is extremely rough from the insulation. Making it less so just isn’t worth it in the grand scheme since it’s a trivial loss vs the mass penalty (among other things) of making the skin perfectly smooth. I reckon it’s a similar deal with Starship, the tiles are aerodynamically good enough. At least for now. 13 minutes ago, mikegarrison said: The word you want to search on is "riblets", Mmmmmmm, riblets… Quote Link to comment Share on other sites More sharing options...
JoeSchmuckatelli Posted September 28, 2021 Share Posted September 28, 2021 19 minutes ago, mikegarrison said: riblets 'Easy to damage, hard to maintain' And 7 minutes ago, CatastrophicFailure said: After the first couple of minutes of flight it ceases to be a concern at all, really. A rocket only needs to be aerodynamic enough, ... Are the perfect answers. Thanks fellers! Edit - back to the question of hexes vs scales for reentry plasma - is there anything to add besides 'they just need to be good enough' and 'unnecessarily complicated /expensive for the comparable benefits'? Quote Link to comment Share on other sites More sharing options...
CastleKSide Posted September 28, 2021 Share Posted September 28, 2021 I think the thermal expansion potential of the a scale like design could be useful. Def more intuitive space for expansion without gaps, but maybe the sliding forces could cause scratches? Might be hard to tell if they were underneath the other tiles too, and lead to needing costly inspections. Is the expansion of the tiles even a concern? Do we know the coefficent of whatever material they are using? Quote Link to comment Share on other sites More sharing options...
zolotiyeruki Posted September 28, 2021 Share Posted September 28, 2021 I'd be concerned about "fish scale" tiles when SS does the backflip and final descent. Quote Link to comment Share on other sites More sharing options...
Beccab Posted September 28, 2021 Share Posted September 28, 2021 https://www.cameroncountytx.gov/spacex/ Road closures have been updated, looks like we may get another cryo test tonight Quote Link to comment Share on other sites More sharing options...
StrandedonEarth Posted September 28, 2021 Share Posted September 28, 2021 16 minutes ago, zolotiyeruki said: I'd be concerned about "fish scale" tiles when SS does the backflip and final descent. Yeah, it might start “porpoising” Quote Link to comment Share on other sites More sharing options...
zolotiyeruki Posted September 28, 2021 Share Posted September 28, 2021 37 minutes ago, StrandedonEarth said: Yeah, it might start “porpoising” What I'm imagining is airflow running from tail-to-nose and trying to get under the scales. Quote Link to comment Share on other sites More sharing options...
magnemoe Posted September 28, 2021 Share Posted September 28, 2021 15 hours ago, CatastrophicFailure said: I think that's supposed to be headER tank... The overlapping tiles works well for tiled roofs, it was an pretty common type of medieval armor and fish and many plant use it. However it tend to require pretty thin tiles, yes not so much for tiled roofs but they only need to be watertight from rain who tend to come from above. Now Musk responding to Everyday astronaut is awesome. Now metal is way stronger but can not handle the heat of ceramic. Quote Link to comment Share on other sites More sharing options...
Kerwood Floyd Posted September 28, 2021 Share Posted September 28, 2021 1 hour ago, StrandedonEarth said: Yeah, it might start “porpoising” Well, that might just be a red herring. Quote Link to comment Share on other sites More sharing options...
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