The tweet archive.

“Thursday 2pm”

“@katlinegrey @lrocket @Alexis_wwww Rest of SpaceX propulsion still very active, so only ~50 full-time equivalent people right now. That will grow a lot as we enter production. It’s 10X harder (at least) to design engine production system than engine. In automotive, 100X harder.”

“@annerajb @flcnhvy @DrivingSlate @TeslaParaTodos @JenniferSensiba @cleantechnica @28delayslater Maybe active in a month or so. Focus right now is getting to high speed, tight follow distance in test tunnel.”

“@annerajb @flcnhvy @DrivingSlate @TeslaParaTodos @JenniferSensiba @cleantechnica @28delayslater Yes, exciting potential”

“@flcnhvy @DrivingSlate @TeslaParaTodos @JenniferSensiba @cleantechnica @28delayslater Exactly”

“@annerajb @lrocket @Alexis_wwww @katlinegrey Printers are too small. Also, high pressure, high efficiency engines need copper cooling channels with an inco/steel jacket. Can’t print yet.”

“@DrivingSlate @TeslaParaTodos @JenniferSensiba @cleantechnica @28delayslater Exactly. This has now happened several times. Something is broken with SEC oversight.”

“@lrocket @Alexis_wwww @katlinegrey Tom did an awesome job leading Merlin, Kestrel, Draco & other engine developments from start through 2014 that were critical to SpaceX’s success. Great respect & appreciation!”

“@JaneidyEve Thank you Evelyn, I loved it”

“@alexmd2 @JPUConn @WSJ Indeed. I have great respect for judges. It’s not perfect, but, in general, we should be very glad of the US justice system.”

“@JPUConn @WSJ SEC forgot to read Tesla earnings transcript, which clearly states 350k to 500k. How embarrassing … 🤗”

“Oh hi lol https://t.co/9WvbtTHoxS”

“Fate *loves* irony. Frankly, too much.”

“Meetings are a valuable use of time! https://t.co/sDcKdBp5e5”

“@JayBahel https://t.co/LJJCD7BAgX http://stankmemes.com”

“Respawn++ https://t.co/MLAGk38Lkk”

“Great meme review hosted by Will Smith”

“@xkcdComic Haha true”

“@nextspaceflight It’s designed to be way better. We’ll see what reality has to say about that.”

“@nextspaceflight Yes, lot of risk”

“@TGMetsFan98 @nextspaceflight Guys, I have feelings … 😜”

“@flcnhvy @rogiermaas @SpaceX Focusing on Starship instead”

“@rogiermaas @SpaceX Deorbits & burns up over the Pacific”

“@Erdayastronaut @CanzyD Upper stage is flight, except mass sim in place of Merlin. It will get fragged for sure by aero loads & Dragon abort thrusters.”

“@SpaceXUpdates @CanzyD Including Heavy, which is 3 cores, around 20 or so”

“@nextspaceflight Depends on when Crew Dragon comes back. That’s scheduled for launch next Saturday, but lot of new hardware, so time error bars are big.”

“@CanzyD High probability of this particular rocket getting destroyed by Dragon supersonic abort test. Otherwise, at least 20 or 30 missions for Falcon 9. Starship will take over before the F9 fleet reaches end of life.”

“@SpaceXUpdates Crew Dragon high altitude abort test”

“@sivarajkumar237 Yes 😀”

“Highest reentry heating to date. Burning metal sparks from base heat shield visible in landing video. Fourth relight scheduled for April.”

“@abbygarrettX @DJSnM @Erdayastronaut @sasor098 @AdamHugo @WayCharMar @fan_of_racing @bkent136 @macodiseas @katlinegrey Always liked Kestrel. It was the Robin Hood of engines.”

“@DJSnM @DanAloni @Kell31213876 @Vadim15258417 @Erdayastronaut @sasor098 @AdamHugo @WayCharMar @fan_of_racing @bkent136 @macodiseas @katlinegrey Advanced, reusable rockets are all we need to become a multiplanet civilization. Once we have a city on Mars, interplanetary travel will create a forcing function for vast improvements in spaceflight.”

“@gavbrowne @bluemoondance74 @DanAloni @Kell31213876 @Vadim15258417 @DJSnM @Erdayastronaut @sasor098 @AdamHugo @WayCharMar @fan_of_racing @bkent136 @macodiseas @katlinegrey SN2 has changes that should help”

“@balcsi32 @DanAloni @Kell31213876 @Vadim15258417 @DJSnM @Erdayastronaut @sasor098 @AdamHugo @WayCharMar @fan_of_racing @bkent136 @macodiseas @katlinegrey To the first part. I doubt we’d create a Dyson ring or sphere.”

“@balcsi32 @DanAloni @Kell31213876 @Vadim15258417 @DJSnM @Erdayastronaut @sasor098 @AdamHugo @WayCharMar @fan_of_racing @bkent136 @macodiseas @katlinegrey Yes”

“@DanAloni @Kell31213876 @Vadim15258417 @DJSnM @Erdayastronaut @sasor098 @AdamHugo @WayCharMar @fan_of_racing @bkent136 @macodiseas @katlinegrey Anti-matter production would require vast amounts of energy. No need though. We have a super reliable, massive, free fusion reactor called the sun.”

“@Kell31213876 @Vadim15258417 @DJSnM @Erdayastronaut @sasor098 @AdamHugo @WayCharMar @fan_of_racing @bkent136 @macodiseas @katlinegrey Exactly. Super money move is anti-matter drive, especially if you solve capturing antiprotons in deep space.”

“@DJSnM @Erdayastronaut @sasor098 @AdamHugo @WayCharMar @fan_of_racing @bkent136 @macodiseas @katlinegrey You can see the streaks on the vacuum Merlin nozzle in flight videos”

“@DJSnM @Erdayastronaut @sasor098 @AdamHugo @WayCharMar @fan_of_racing @bkent136 @macodiseas @katlinegrey Pinter injector tends to have hot & cold streaks. Hot streaks burn a rut at the throat that accelerates erosion.”

“@benoitdenayer @navincho @katlinegrey Essentially, yes. Great engineering talent, but should focus on reusable rockets for purpose of a permanent human base on the moon and self-sustaining city on Mars.”

“@RichPitre_CO @katlinegrey We are constrained by the accredited investor rule, but will think about how this could be done”

“@Erdayastronaut @sasor098 @AdamHugo @WayCharMar @fan_of_racing @bkent136 @macodiseas @katlinegrey Yeah, that was a bit embarrassing ☺️High engine chamber pressure and ablative don’t get along. Ok for low pressure, expendable upper stage.”

“@sasor098 @AdamHugo @WayCharMar @fan_of_racing @bkent136 @macodiseas @katlinegrey That’s true 😀 Merlin 1A was terrible. 1C was ok, 1D good, but block 5 Merlin (should probably be called 1E) is something special. Took about 15 years to get there.”

“@Erdayastronaut @MarekCyzio @katlinegrey Actually, they received (and still receive) almost a billion dollars a year for “launch capability”. Even if they do zero launches, US govt still gives them that.”

“@Geopilot @katlinegrey Don’t know”

“@katlinegrey SpaceX commercial 🚀 launch market share went from 0% in 2010 to 65% in 2018. Despite massive subsidies to Boeing/Lockeed, they have never won a fair competition against SpaceX for several years. https://t.co/sqAYCCcJtd”

“@martinengwicht @macodiseas @katlinegrey Exactly. That’s the critical point for Starship/BFR: more payload than the biggest rocket ever made, but for less money per launch than the smallest (orbital) rocket. Without something that lowers orbital flight cost by 100X, humanity will never be a multiplanet species.”

“@fan_of_racing @bkent136 @macodiseas @katlinegrey SpaceX Merlin architecture is simpler than staged combustion (eg SSME or RD), but it has world record for thrust/weight & thrust/cost engine. Raptor has better Isp, but I’m worried it may fall short on those two critical metrics.”

“@wonderofscience So true 🤡 John Clarke 👌”

“@Tom_Heats @coindesk Whoever owns the early BTC deserves a Nobel prize in delayed gratification”