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Phys.org
@physorg_com · 11 июн. 2020 г.
Could we run out of #sand? Scientists adjust how grains are measured @nature @SciReports phys.org/news/2020-06-s…
Elon Musk
@elonmusk · 11 июн. 2020 г.
I thought this was an Onion article
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Apollo
@blue_bnd · 11 июн. 2020 г.
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 · 11 июн. 2020 г.
Staggeringly dumb
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Pranay Pathole
@PPathole · 11 июн. 2020 г.
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 · 11 июн. 2020 г.
I got the fuel cell question about 8000 times
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Elon Musk
@elonmusk · 11 июн. 2020 г.
Ответ на @rhodanazanin1
It’s getting Biblical
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Kyle Field
@mrkylefield · 11 июн. 2020 г.
This Stunning Chart Shows Why Battery Electric Vehicles Win cleantechnica.com/2020/06/10/thi…
Elon Musk
@elonmusk · 11 июн. 2020 г.
Exactly, fuel cells = fool sells
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Anish Pai
@anishpai99 · 10 июн. 2020 г.
What do you think about this? @elonmusk
About 60% of worlds electricity is produced using fossil fuels
Elon Musk
@elonmusk · 11 июн. 2020 г.
Renewable energy passed coal in April
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Disillusioned... 🥷
@TeslaTruckClub · 10 июн. 2020 г.
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 · 11 июн. 2020 г.
Worth considering
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Elon Musk
@elonmusk · 11 июн. 2020 г.
Ответ на @pandabfr
Agreed
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Elon Musk
@elonmusk · 10 июн. 2020 г.
Ответ на @Ophiltry
Trèy Boucher
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Elon Musk
@elonmusk · 10 июн. 2020 г.
Catapults are a great way to get somewhere fast
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jack
@jack · 10 июн. 2020 г.
Did you read the article you’re about to spread?
Elon Musk
@elonmusk · 10 июн. 2020 г.
Great point. Many articles are retweeted based on headlines that don’t match the content.
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James Tyrrell 🇺🇦
@jamesrtyrrell · 10 июн. 2020 г.
We're on SN5/6/7 and there are plans continuing past SN50!! well.. holy shit.
Elon Musk@elonmusk· 10 июн. 2020 г.@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 · 10 июн. 2020 г.
Actually, we’re on SN30 for Raptor
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Everyday Astronaut
@Erdayastronaut · 10 июн. 2020 г.
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 · 10 июн. 2020 г.
Sure. That’s long montage 🤣🤣
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World of Engineering
@engineers_feed · 10 июн. 2020 г.
You’re going to land where??
x.com/flyezequiel/st…
Elon Musk
@elonmusk · 10 июн. 2020 г.
Wow
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Michael Sheetz
@thesheetztweetz · 10 июн. 2020 г.
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 · 10 июн. 2020 г.
❤️ the laser beam long exposure shots
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Nick Wijngaards
@nickwijngaards · 10 июн. 2020 г.
I’m curious to see new test footage or specs improvements of the raptor engine. SN1 vs SN20 🚀
Elon Musk
@elonmusk · 10 июн. 2020 г.
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 · 10 июн. 2020 г.
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 · 10 июн. 2020 г.
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 · 10 июн. 2020 г.
After which they are recycled
Elon Musk
@elonmusk · 10 июн. 2020 г.
Tesla factory workplace safety is 5% better than industry average for manufacturers & improving fast
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Elon Musk
@elonmusk · 10 июн. 2020 г.
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 · 10 июн. 2020 г.
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 · 10 июн. 2020 г.
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 · 10 июн. 2020 г.
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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