The tweet archive.

“@MarcusHouse @artzius Current plan is to increase base Raptor thrust to ~230 tons or ~500 million lbs & increase booster engine count to 32 or 33”

“@TGMetsFan98 Outer engine ring is fixed angle, but can throttle”

“@torybruno @Dynetics Should I bring a few spare engines … I mean, just in case.”

“@torybruno @Dynetics When do the engines arrive? 😉”

“@Wildreamz @engineers_feed True”

“@eroxer310 @MotorTrend @Tesla Steam engines are even better!”

“@DimaZeniuk @Tesla @WholeMarsBlog @dami_kolz @Kristennetten @1stMarsColonist @melaniemadri @daelmor @RationalEtienne @EvaFoxU @AstroJordy @28delayslater It is an honor to work with such talented engineers”

“@ajtourville The Plaid carbon-wrapped motor is arguably the most advanced motor on Earth outside of maybe a lab somewhere. We have to keep some secrets! We have a few ideas for increasing torque & max rpm even further for new Roadster. Definitely fun & exciting engineering ahead!”

“@lexfridman Tesla engineering is awesome!”

“@KennyLoaded @BillyM2k Some engineers I worked with went on to help create WoW, but it was too addicting. Couldn’t afford the time (sigh).”

“@engineers_feed 🤣🤣”

“@nextspaceflight @NASASpaceflight @BocaChicaGal @SpaceX 29 Raptors on Booster initially, rising to 32 later this year, along with thrust increase per engine. Aiming for >7500 ton thrust long-term. T/W ~1.5.”

“@MeetLuis @WARREZ420 @WholeMarsBlog Rawlinson was never chief engineer. He arrived after Model S prototype was made, left before things got tough & was only ever responsible for body engineering, not powertrain, battery, software, production or design.”

“@PPathole An advantage I did have is that my father is a talented electrical & mechanical engineer, so I was taught a lot engineering (without appreciating it at the time)”

“Tesla AI/Autopilot engineering is awesome! Making excellent progress solving real-world AI.”

“@ErcXspace @SpaceX 69th Raptor engine coming soon”

“@engineers_feed Due to lower gravity, you can travel from surface of Mars to surface of Earth fairly easily with a single stage rocket. Earth to Mars is vastly harder.”

“@spacex360 Ascent phase, transition to horizontal & control during free fall were good. A (relatively) small CH4 leak led to fire on engine 2 & fried part of avionics, causing hard start attempting landing burn in CH4 turbopump. This is getting fixed 6 ways to Sunday.”

“@Adamklotz_ @SpaceX BN1 is a manufacturing pathfinder, so will be scrapped. We learned a lot, but have already changed design to BN2. Goal is to get BN2 with engines on orbital pad before end of April. It might even be orbit-capable if we are lucky.”

“Please consider moving to Starbase or greater Brownsville/South Padre area in Texas & encourage friends to do so! SpaceX’s hiring needs for engineers, technicians, builders & essential support personnel of all kinds are growing rapidly.”

“@Adamklotz_ @SpaceX SN15 rolls to launch pad in a few days. It has hundreds of design improvements across structures, avionics/software & engine. Hopefully, one of those improvements covers this problem. If not, then retrofit will add a few more days.”

“@SpaceX Looks like engine 2 had issues on ascent & didn’t reach operating chamber pressure during landing burn, but, in theory, it wasn’t needed. Something significant happened shortly after landing burn start. Should know what it was once we can examine the bits later today.”

“@thejackbeyer @NASASpaceflight Green flame in this context means engine is burning internal components made of copper. This is usually followed by a RUD (Rapid Unscheduled Disassembly).”

“@austinbarnard45 SN10 engine was low on thrust due (probably) to partial helium ingestion from fuel header tank. Impact of 10m/s crushed legs & part of skirt. Multiple fixes in work for SN11.”

“@engineers_feed Ultimately, yes”

“Out on launch pad, engine swap underway https://t.co/QNXGtL90WN”

“@TheFavoritist @NASASpaceflight @BocaChicaGal One of the engines is suspect, so we’re swapping it out”

“@business To be clear, I am *not* an investor, I am an engineer. I don’t even own any publicly traded stock besides Tesla. However, when fiat currency has negative real interest, only a fool wouldn’t look elsewhere. Bitcoin is almost as bs as fiat money. The key word is “almost”.”

“@Erdayastronaut Good analysis. We’re working on lowering min throttle of Raptor, so that there is engine redundancy throughout the landing burn.”

“@josh_bickett @ajtourville @Erdayastronaut @SpaceX Yeah. By default, engine with least lever arm would shut down if all 3 are good.”

“@ajtourville @Erdayastronaut @SpaceX Yes, but engines have a min throttle point where there is flameout risk, so landing on 3 engines means high thrust/weight (further away from hover point), which is also risky”

“@Erdayastronaut @SpaceX It was foolish of us not to start 3 engines & immediately shut down 1, as 2 are needed to land”

“@Erdayastronaut @TJ_Cooney @lrocket @SpaceX @FelixSchlang @MarcusHouseGame He became a big fan of methane, but was not pushing it initially. That came from me reading about Soviet methane engine tests that got over 380 Isp. At that Isp, a subcooled methane stage gets slightly better delta-V than a hydrogen stage.”

“@TJ_Cooney @lrocket @SpaceX @FelixSchlang @MarcusHouseGame That sounds correct. Tom certainly deserves a lot of credit for his excellent work on those engines! Dean Ono too for Kestrel & Draco.”

“@thejackbeyer @NASASpaceflight Cryoproof, then install engines”

“@engineers_feed Earth is small & we are smaller still https://t.co/gTOhcLGJ82”

“@28delayslater Finishing engineering this year, production starts next year. Aiming to have release candidate design drivable late summer. Tri-motor drive system & advanced battery work were important precursors.”

“@Erdayastronaut We’re making major improvements to ease of engine swap. Needs to be a few hours at most.”

“@PPathole @johnkrausphotos @SpaceX Two of the engines need slight repairs, so will be switched out”

“Today at SpaceX is about practicing Starship engine starts. Ship is held down by massive pins while engines are fired. Two starts completed, about to try a third.”

“@PPathole @engineers_feed Yes, that would be the best way to do it. A large solar field or reactor is needed for power, and then some ice mining droids or long maneuvering drills are needed for the H2O. These are probably the trickier bits.”

“@engineers_feed His sick beats https://t.co/8PbsgffzRp https://teslatheband.com”

“@eugenelee3 @engineers_feed Yup”

“@engineers_feed Indirectly, an electric rocket is possible by using electricity to convert CO2+H2O —> CH4+O2. This will be needed on Mars even for early missions & Earth too over time.”

“@engineers_feed Not to get to orbit, unfortunately. In space, photon emission powered by matter-antimatter annihilation would rock, but that’s more of a long-term solution.”

“@engineers_feed Very important”

“12 story rocket turns off its engines & does a controlled fall”

“@teslaownerssv It will get absurdly good. Tesla AI/Autopilot engineering is awesome! There’s some great AI out there, but can it self-drive while playing Cyberpunk … ?”

“@Erdayastronaut @flightclubio The Raptors were well below max thrust or the ship would have blown through the altitude limit. As we hit min throttle point, an engine would shut off.”

“@Erdayastronaut @flightclubio Far from fully loaded, but we were going slow or the ship would have gone crazy high/far with three engines”