Latest posts · Page 2161

@engineers_feed Wow

@thesheetztweetz @SpaceX @Commercial_Crew @AstroBehnken @Astro_Doug @ingallsimages @NASAKennedy ❤️ the laser beam long exposure shots

@nickwijngaards @Erdayastronaut @SciGuySpace Hundreds of improvements in manufacturability primarily (this is by far the hardest problem), mass down, thrust up, Isp up. Current improvement list continues past SN50. As the saying goes, it’s 1% inspiration & 99% perspiration …

@John_Gardi @SciGuySpace Also, insulation of a deep cryogen( which I’d call anything that liquifies nitrogen aka 78% of air) is heavy & prone to heat leaks. H2 is hell.

Tesla factory workplace safety is 5% better than industry average for manufacturers & improving fast https://t.co/axmInA9fZb

@Erdayastronaut @SciGuySpace Important technical note: due to higher O/F of CH4 vs RP1 (oxygen is dense) & significant density increase of subcooled CH4 (plus no common dome insulation needed), plus cryo strength bump of CH4, tank mass of CH4/O2 stage is almost same as RP1/O2.

@Erdayastronaut @SciGuySpace We could never reach 380 Isp with RP/kerosene. CH4 has higher Isp potential on paper, but even better in practice. With CH4, you can reach >99% of max theoretical combustion efficiency, but RP is ~97% on a good day & requires desooting of turbines between flights.

After which they are recycled https://t.co/xuu1ohdz52

Tesla batteries are lasting much longer than 200k miles / 320k km https://t.co/z882nf6yv9

Moreover, energy produced by Tesla solar deployments far exceeds energy used in our factories https://t.co/IDqf5gWeFt

Electric cars produce *much* less CO2 than fossil fuel cars, taking both electricity emission & vehicle production into acount https://t.co/tsk9TXgW67

https://t.co/QPwGa1Rk8Z

Posting Tesla Impact Report, this time with summary points & charts in my reply tweets https://t.co/4lyaV7kIS4

@venus47203379 @engineers_feed Haha. Will post summary.

@SciGuySpace Combined with SpaceX deep subcooling of propellants to near liquefaction temp of N2, use of common dome (CH4 & O2 liquid at similar temps) & higher T/W of engines enables de facto higher delta-V than an H2/O2 stage

@SciGuySpace Quite a piece! I should credit Soviet/Russian engine work in the 80’s as being a factor in deciding to switch from H2 to CH4. They demonstrated excellent performance on test stands, with Isp up to 380 secs.

Wort reading the whole thing https://t.co/4lyaV7kIS4

@jgrano305 @ICannot_Enough @GerberKawasaki @Tesla @joerogan We shall see …

@flcnhvy @GerberKawasaki @Tesla @joerogan Maybe I should retweet the top four or five point. What caught your eye the most?

@flcnhvy @GerberKawasaki @Tesla @joerogan Good point!