tater Posted June 12, 2023 Share Posted June 12, 2023 Quote Link to comment Share on other sites More sharing options...
darthgently Posted June 13, 2023 Share Posted June 13, 2023 The plume from new stubby bell on 2nd stage doesn't have greenish tinge that I normally see. Could the green tinge have been from aft portion of longer bell getting too hot? Iconel has copper iirc. Stubby seems much cooler given duller flame color in general Quote Link to comment Share on other sites More sharing options...
tater Posted June 13, 2023 Share Posted June 13, 2023 34 minutes ago, darthgently said: The plume from new stubby bell on 2nd stage doesn't have greenish tinge that I normally see. Could the green tinge have been from aft portion of longer bell getting too hot? Iconel has copper iirc. Stubby seems much cooler given duller flame color in general Does Mvac use film cooling? Sorta looks like it. Quote Link to comment Share on other sites More sharing options...
tater Posted June 13, 2023 Share Posted June 13, 2023 Quote Link to comment Share on other sites More sharing options...
darthgently Posted June 13, 2023 Share Posted June 13, 2023 9 hours ago, tater said: That 2nd tweet really drives it home. We are well into a new era Quote Link to comment Share on other sites More sharing options...
AckSed Posted June 13, 2023 Share Posted June 13, 2023 Frigging hell that is a sine-wave of launches and landings. How much upmass is that now? Quote Link to comment Share on other sites More sharing options...
Terwin Posted June 13, 2023 Share Posted June 13, 2023 6 minutes ago, AckSed said: Frigging hell that is a sine-wave of launches and landings. How much upmass is that now? 239 launches according to the video Wiki: 17.4 t (38,000 lb) when landing on ASDS So 4158.6 tons max if they were all F9 drone landings, but there were also some heavies and plenty of launches below max capacity, so no idea on the actual total, but that seems like a reasonable ball-park. Quote Link to comment Share on other sites More sharing options...
tater Posted June 13, 2023 Share Posted June 13, 2023 Note that "test" in this context could mean any sort of test, doesn't have to be a flight. Quote Link to comment Share on other sites More sharing options...
darthgently Posted June 14, 2023 Share Posted June 14, 2023 (edited) The idea of having a 4+ deep queue production line of evolving prototypes of >Saturn V sized rockets is mind boggling compared to industry norms. Consider that when New Glenn makes its first flight I wonder if it might be the only one, or maybe one of two, prototypes. SpaceX is not just making rockets fungible, rather than precious, unique, and rare, via F9, it is doing similar with Starship+booster prototypes. This is the way Edited June 14, 2023 by darthgently Quote Link to comment Share on other sites More sharing options...
CastleKSide Posted June 14, 2023 Share Posted June 14, 2023 3 hours ago, darthgently said: SpaceX is not just making rockets fungible, rather than precious, unique, and rare, via F9, it is doing similar with Starship+booster prototypes. The building requirements really help. Steel welded in open air rather than finely machined aluminum ala Atlas 5 or Vulcan. Or even if they had stuck with thier earlier plan of carbon fiber bodies. Would we have seen this kind of cadence if every piece was being rolled on a huge machine in California? Somehow I doubt it. Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted June 14, 2023 Share Posted June 14, 2023 On 6/12/2023 at 8:56 PM, tater said: On 6/12/2023 at 8:21 PM, darthgently said: The plume from new stubby bell on 2nd stage doesn't have greenish tinge that I normally see. Could the green tinge have been from aft portion of longer bell getting too hot? Iconel has copper iirc. Stubby seems much cooler given duller flame color in general Does Mvac use film cooling? Sorta looks like it. The sea level Merlin 1D dumps the gas generator exhaust overboard, but the MVac delivers the gas generator exhaust into the downstream portion of the nozzle. The purpose here isn't really film cooling so much as it is squeezing a little extra Isp out of the engine by increasing mass flow through the end of the nozzle (just like the original F-1 engines did), but it does do a little film cooling, and that's why it looks the way it does. To @darthgently's question: I believe that SpaceX switched the nozzle extension material from a metal alloy to carbon-carbon some time around 2019 but I could be wrong. If it's RCC, any green tinge would not be from copper. The initial green tinge comes from the use of TEA-TEB for starts and restarts, but that usually fades quickly. It might just be a camera artifact. On 6/13/2023 at 9:14 AM, darthgently said: That 2nd tweet really drives it home. We are well into a new era Amazing. Quote Link to comment Share on other sites More sharing options...
darthgently Posted June 14, 2023 Share Posted June 14, 2023 26 minutes ago, sevenperforce said: It might just be a camera artifact. I'd kind of written off the green tinge as an artifact of my screen, lol, as no one else was confirming seeing it and I was seeing it throughout the burn, not just ignition Quote Link to comment Share on other sites More sharing options...
tater Posted June 14, 2023 Share Posted June 14, 2023 Spin prime test apparently: Quote Link to comment Share on other sites More sharing options...
Superluminal Gremlin Posted June 14, 2023 Share Posted June 14, 2023 3 hours ago, sevenperforce said: TEB What the SR-71 used? Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted June 14, 2023 Share Posted June 14, 2023 On 6/13/2023 at 9:47 AM, Terwin said: 239 launches according to the video Wiki: 17.4 t (38,000 lb) when landing on ASDS So 4158.6 tons max if they were all F9 drone landings, but there were also some heavies and plenty of launches below max capacity, so no idea on the actual total, but that seems like a reasonable ball-park. From 2010 through 2019, Falcon 9 and Falcon Heavy launched 428.3 tonnes to orbit, not including the Zuma launch or the NROL-76 (although both of those were RTLS, so fairly low total mass). From 2019 through 2022, Falcon 9 and Falcon Heavy launched 1,251.1 tonnes to orbit, not including a number of classified NROL launches or Transporter-2 through Transporter-5. So far this year, SpaceX has sent 434.0 tonnes to orbit using forty launches and is on track for a total of 100 total launches. So the total mass SpaceX has put in orbit is somewhere slightly above 2,114 tonnes. Keep in mind that many of these launches went below LEO, so they had lower gross mass but much higher energy. With a current capacity of 100 Falcon 9 launches per year and a per-launch demonstrated max payload of 17.6 tonnes with RTLS, SpaceX can put 1,7600 tonnes into LEO annually. 21 minutes ago, Superluminal Gremlin said: What the SR-71 used? Yep. Also what the F-1 engine used, what Rocketlab uses for its Rutherford engine, and what Firefly Aerospace uses to ignite its Reaver engine. Its application is more common with rocket engines than jet engines, actually. The JP-7 fuel used for the SR-71 is notoriously difficult to ignite, so that's why they skipped a conventional ignition plug system and went with TEA-TEB. The SR-71 could refuel in-flight so its persistence was typically limited by how much TEA-TEB it could carry and how many times it fired its afterburners. Quote Link to comment Share on other sites More sharing options...
Superluminal Gremlin Posted June 14, 2023 Share Posted June 14, 2023 That's actually a lot more engines than I expected. Makes sense though now that I remember reading 'Ignition', its mentioned in there with some engines. Quote Link to comment Share on other sites More sharing options...
Royalswissarmyknife Posted June 14, 2023 Share Posted June 14, 2023 Spin Prime Aborted hope it can do it tomorrow Quote Link to comment Share on other sites More sharing options...
Pat20999 Posted June 16, 2023 Share Posted June 16, 2023 The 2 ships are gonna be very important cuz of Artemis 3&4, these ships will perform the orbital refuelling test and like sn25 being a copy of sn24, sn27 is a backup copy for ship 26. With ship 28 and ship 26 the test will go to test orbital refuelling. Quote Link to comment Share on other sites More sharing options...
Geonovast Posted June 16, 2023 Share Posted June 16, 2023 @Pat20999, your thread has been merged into the SpaceX thread. Quote Link to comment Share on other sites More sharing options...
Pat20999 Posted June 16, 2023 Share Posted June 16, 2023 19 minutes ago, Geonovast said: @Pat20999, your thread has been merged into the SpaceX thread. Ok Quote Link to comment Share on other sites More sharing options...
tater Posted June 17, 2023 Share Posted June 17, 2023 Tomorrow afternoon. Quote Link to comment Share on other sites More sharing options...
tater Posted June 18, 2023 Share Posted June 18, 2023 Live Quote Link to comment Share on other sites More sharing options...
tater Posted June 18, 2023 Share Posted June 18, 2023 Nominal orbit, landing Quote Link to comment Share on other sites More sharing options...
tater Posted June 20, 2023 Share Posted June 20, 2023 Tomorrow night. Quote Link to comment Share on other sites More sharing options...
PakledHostage Posted June 21, 2023 Share Posted June 21, 2023 Practical Engineering did a video about the Boca Chica launch pad. Possibly nothing new to many here, but might still be interesting to some: Quote Link to comment Share on other sites More sharing options...
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