Latest posts · Page 2260

@WorldAndScience Common myth, but incorrect

@slashdot And so begins the robocalypse …

Tesla wins best headlights award 🥇 https://t.co/8yfeJiXd0N

@Teslarati The final configuration used at Nürburgring to set the record will go into production around summer 2020, so this is not merely for the track

Anyone who’s interested in working on cutting edge manufacturing — designing & building the machine that makes the machine — please consider working at Tesla or SpaceX. We’re gonna take this to a whole new level!

@Erdayastronaut Tesla team has done an incredible job with Giga Shanghai. Honored to work with them. I’m in awe.

So much respect for those doing high volume manufacturing. It’s insanely hard, but you make a real thing that people value. My hat is off to you …

@RationalEtienne @LaurenRow5 @EvaFoxU @JohnnaCrider1 @Kristennetten @vincent13031925 @28delayslater @Sofiaan @hamids @InsideEVs Tesla is first American car company to achieve sustained volume production in past ~100 years. Hardest, most painful thing I’ve ever been through, including getting Falcon to orbit.

@RationalEtienne @LaurenRow5 @EvaFoxU @JohnnaCrider1 @Kristennetten @vincent13031925 @28delayslater @Sofiaan @hamids @InsideEVs Prototypes are easy, but achieving volume production of a new technology is insanely hard

And the lead character is also named Woody https://t.co/ZxK84rB020

@NotEricRalph @MartianDays @Erdayastronaut @torybruno @AerojetRdyne Yeah, gimbal SL engines at min throttle for control, so most of impulse goes through vac engines

@TTownJoe @Erdayastronaut @torybruno @MartianDays @AerojetRdyne Conservation of energy tells you the answer

@Ingvar_Oolsen @neiltyson @Space_Station Looking forward to Kerbal 2!

@MartianDays @Erdayastronaut @torybruno @AerojetRdyne We def could be wrong about this, but it’s actually good to fix high efficiency vacuum engines with giant nozzles in place & only thrust vector engines with smaller nozzles. Don’t need a lot of room & moment of inertia is much lower.

@nextspaceflight @Erdayastronaut @torybruno @MartianDays @AerojetRdyne Also, we’re keeping area ratio low enough to fire Raptor Vac at sea level without flow separation, so that’s leaving a lot on the table

@nextspaceflight @Erdayastronaut @torybruno @MartianDays @AerojetRdyne Couple months, but V1.0 of Raptor Vac is suboptimal, as optimized for speed of development. Isp maybe 365 to 370 sec.

@Erdayastronaut @torybruno @MartianDays @AerojetRdyne Max thrust version of Raptor should achieve true T/W > 170. Target is 1.5 ton engine with >260 t-F. Max Isp version should achieve ~380 sec, but T/W probably <120 due to big nozzle. These are just guesses for now.

@Erdayastronaut @torybruno @MartianDays @AerojetRdyne Oberth effect is not well appreciated. Value of high thrust low in gravity well is not captured in simple delta-v equation. One of the reasons we favor CH4 over H2. https://t.co/LijrUMuJDq

@torybruno @Erdayastronaut @MartianDays @AerojetRdyne This is true. All that matters is number used in ∆v equation. Propellant residuals are incredibly important, often overwhelming engine mass. https://t.co/s2LcEapGAU

@HarryStoltz1 @neiltyson @Space_Station Big challenge for Starship refueling on the moon is finding sources of carbon. Probably some pretty big deposits in craters from meteorites. Same goes for hydrogen & oxygen, also in (shadowed) craters.