Posts
Phys.org
@physorg_com · Jun 11, 2020
Could we run out of #sand? Scientists adjust how grains are measured @nature @SciReports phys.org/news/2020-06-s…
Elon Musk
@elonmusk · Jun 11, 2020
I thought this was an Onion article
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Apollo
@blue_bnd · Jun 11, 2020
Big problem:
"..Right now, hydrogen is made as a by-product of fertilizer and oil refining. South Korea isn’t ideal for wind and solar energy. Korea will produce what it can from the renewable energy capacity it has but it won’t be enough. The rest will be imported.."
Elon Musk
@elonmusk · Jun 11, 2020
Staggeringly dumb
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Pranay Pathole
@PPathole · Jun 11, 2020
Fuel cells, they always have been silly
A. How's this stuff work?
B. It's kinda like a hydrogen battery except not really.
A. So it's better than normal batteries right?
B. Well no not really...
A. Better than gas at least!
B. Uhh... Umm... Well here's the thing
Elon Musk
@elonmusk · Jun 11, 2020
I got the fuel cell question about 8000 times
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Elon Musk
@elonmusk · Jun 11, 2020
Replying to @rhodanazanin1
It’s getting Biblical
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Kyle Field
@mrkylefield · Jun 11, 2020
This Stunning Chart Shows Why Battery Electric Vehicles Win cleantechnica.com/2020/06/10/thi…
Elon Musk
@elonmusk · Jun 11, 2020
Exactly, fuel cells = fool sells
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Anish Pai
@anishpai99 · Jun 10, 2020
What do you think about this? @elonmusk
About 60% of worlds electricity is produced using fossil fuels
Elon Musk
@elonmusk · Jun 11, 2020
Renewable energy passed coal in April
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Disillusioned... 🥷
@TeslaTruckClub · Jun 10, 2020
It would be great if the Cybertruck's rear window could roll down into the rear wall and then the whole wall fold in on top of folded rear seats.
Perfect for camping when Tonneau is closed, and for carrying things longer than 8’ @elonmusk
Elon Musk
@elonmusk · Jun 11, 2020
Worth considering
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Elon Musk
@elonmusk · Jun 11, 2020
Replying to @pandabfr
Agreed
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Elon Musk
@elonmusk · Jun 10, 2020
Replying to @Ophiltry
Trèy Boucher
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Elon Musk
@elonmusk · Jun 10, 2020
Catapults are a great way to get somewhere fast
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jack
@jack · Jun 10, 2020
Did you read the article you’re about to spread?
Elon Musk
@elonmusk · Jun 10, 2020
Great point. Many articles are retweeted based on headlines that don’t match the content.
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James Tyrrell 🇺🇦
@jamesrtyrrell · Jun 10, 2020
We're on SN5/6/7 and there are plans continuing past SN50!! well.. holy shit.
Elon Musk@elonmusk· Jun 10, 2020@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 …
Elon Musk
@elonmusk · Jun 10, 2020
Actually, we’re on SN30 for Raptor
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Everyday Astronaut
@Erdayastronaut · Jun 10, 2020
Some day can we get a video compilation, “How not to run a full flow staged combustion engine” like the booster landing montage 😂 I’ll bet there’s some speculat failures when pushing Raptor, that would be an amazing video 👌
Elon Musk
@elonmusk · Jun 10, 2020
Sure. That’s long montage 🤣🤣
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World of Engineering
@engineers_feed · Jun 10, 2020
You’re going to land where??
x.com/flyezequiel/st…
Elon Musk
@elonmusk · Jun 10, 2020
Wow
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Michael Sheetz
@thesheetztweetz · Jun 10, 2020
Beamed to space:
This 15 second long-exposure photo captures the fiery trail left by the Falcon 9 rocket that launched NASA astronauts Bob Behnken and Doug Hurley onboard Dragon Endeavour. (Credit: Bill Ingalls / NASA.)
Elon Musk
@elonmusk · Jun 10, 2020
❤️ the laser beam long exposure shots
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Nick Wijngaards
@nickwijngaards · Jun 10, 2020
I’m curious to see new test footage or specs improvements of the raptor engine. SN1 vs SN20 🚀
Elon Musk
@elonmusk · Jun 10, 2020
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 …
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Just A. Tinker
@John_Gardi · Jun 10, 2020
Folks don't realize the mass penalty using hydrogen as rocket fuel.
The Space Shuttle's External Tank carried about four time the volume of liquid hydrogen than its liquid oxygen. Hydrogen is light but takes room that equates to larger tanks. Liquid methane takes much less room.
Elon Musk
@elonmusk · Jun 10, 2020
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.
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Elon Musk
@elonmusk · Jun 10, 2020
After which they are recycled
Elon Musk
@elonmusk · Jun 10, 2020
Tesla factory workplace safety is 5% better than industry average for manufacturers & improving fast
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Elon Musk
@elonmusk · Jun 10, 2020
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.
Elon Musk
@elonmusk · Jun 10, 2020
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.
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Everyday Astronaut
@Erdayastronaut · Jun 10, 2020
I know you’d never add unecessary complexity in the manufacturing line, but I’m still surprised you never made a closed cycle Merlin Vacuum to get closer to that 380 mark. Especially with SpaceX’s experience with ox rich preburners now with Raptor 🚀
Elon Musk
@elonmusk · Jun 10, 2020
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.
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