Posts
Ingvar Olsen
@Ingvar_Oolsen · Oct 14, 2019
If we just made kids play Kerbal Space Program in physics class once in a while, we would probably see a whole new generation with that knowledge and much more🚀
Elon Musk
@elonmusk · Oct 14, 2019
Looking forward to Kerbal 2!
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Elon Musk
@elonmusk · Oct 14, 2019
Replying to @MartianDays
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.
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Elon Musk
@elonmusk · Oct 14, 2019
Couple months, but V1.0 of Raptor Vac is suboptimal, as optimized for speed of development. Isp maybe 365 to 370 sec.
Elon Musk
@elonmusk · Oct 14, 2019
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
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Michael Baylor
@MichaelBaylor_ · Oct 14, 2019
How long until the first Raptor Vacuum version is ready for testing?
Elon Musk
@elonmusk · Oct 14, 2019
Couple months, but V1.0 of Raptor Vac is suboptimal, as optimized for speed of development. Isp maybe 365 to 370 sec.
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Everyday Astronaut
@Erdayastronaut · Oct 14, 2019
Here's the (hard to find) numbers on some aerospikes vs other engines. I would've LOVED to see the RS-2200 be developed. *ON PAPER* it would've been a GREAT engine. My deep dive on aerospikes will be done this week! See anything wrong @torybruno @elonmusk? Renders -
@martiandays
Elon Musk
@elonmusk · Oct 14, 2019
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.
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Everyday Astronaut
@Erdayastronaut · Oct 14, 2019
Here's the (hard to find) numbers on some aerospikes vs other engines. I would've LOVED to see the RS-2200 be developed. *ON PAPER* it would've been a GREAT engine. My deep dive on aerospikes will be done this week! See anything wrong @torybruno @elonmusk? Renders -
@martiandays
Elon Musk
@elonmusk · Oct 14, 2019
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.
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Tory Bruno
@torybruno · Oct 14, 2019
Cool chart. In general, I have found TWR ratios problematic because different people will include (or not) different inert items. Two TWRs from the same manufacturer are usually comparable, but often not from one maker to another
Elon Musk
@elonmusk · Oct 14, 2019
This is true. All that matters is number used in ∆v equation. Propellant residuals are incredibly important, often overwhelming engine mass.
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Elon Musk
@elonmusk · Oct 14, 2019
Exactly. And you can on the moon, since it has no atmosphere.
Elon Musk
@elonmusk · Oct 14, 2019
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.
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Tesla Owners Silicon Valley
@teslaownersSV · Oct 14, 2019
Any updates on autopark
Elon Musk
@elonmusk · Oct 14, 2019
We’re working on a simple initial version of Autopark. Will be safe, but sometimes park in silly places that aren’t actual parking spaces.
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Sofiaan Fraval
@Sofiaan · Oct 14, 2019
The AP software team is incredible. I got to meet one of the AP guys at the track yesterday. We did a smart summon race 😆. So much innovation there!
Elon Musk
@elonmusk · Oct 14, 2019
Yeah, great team!
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Elon Musk
@elonmusk · Oct 14, 2019
Replying to @J_ump_er
To be precise, r is distance from center of masses of two objects. Center of mass of Earth is ~6400km, so gravity change is small at Space Station altitude, which is ~6800km from center of Earth.
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Harry Stoltz
@HarryStoltz1 · Oct 14, 2019
Without air resistance you could theoretically orbit 1 m above the surface
Elon Musk
@elonmusk · Oct 14, 2019
Exactly. And you can on the moon, since it has no atmosphere.
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Neil deGrasse Tyson
@neiltyson · Oct 14, 2019
Christopher Columbus took three months to cross the Atlantic in 1492.
The International @Space_Station takes 15 minutes.
Elon Musk
@elonmusk · Oct 14, 2019
Most people aren’t aware that orbit (and “zero” gravity) is all about horizontal speed, not altitude. A spacecraft needs to travel about 25 times the speed of sound to stay in space.
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NSF - NASASpaceflight.com
@NASASpaceflight · Oct 14, 2019
ARTICLE: SpaceX renovating former Falcon 9 test stand at McGregor -
- By Ian Atkinson (@IanPineapple)
The famous Tripod Stand appears to be making a comeback!
nasaspaceflight.com/2019/10/spacex…
Elon Musk
@elonmusk · Oct 14, 2019
Yeah, will be Raptor vertical test stand. Hopefully allows simplification of Raptor design, as pump shaft wear & drainage is better in vertical config. Also, more representive of flight. Test as you fly …
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Anner J. Bonilla 🇵🇷🛩️🔋🔧
@annerajb · Oct 14, 2019
Does that requires the HW3 computer or just software?
Elon Musk
@elonmusk · Oct 14, 2019
Software
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Steve Martineau
@SteveMartineau · Oct 14, 2019
It must detect wet and icy surface also right?
Will this algorithm be used to adjust the speed of the car depending on weather?
Elon Musk
@elonmusk · Oct 14, 2019
Yes
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Gabriel
@tesla_addicted · Oct 7, 2019
If the construction cones are up, car detects no more lines, if the cones are down (no cones) the car detects more lines 😎 @elonmusk please high five the autopilot Team! #teslav10 #v10
Elon Musk
@elonmusk · Oct 14, 2019
Will start rendering traffic cones in the display soon
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Elon Musk
@elonmusk · Oct 14, 2019
Replying to @flcnhvy
Venus would be very difficult
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Elon Musk
@elonmusk · Oct 14, 2019
Replying to @tesla_truth
True
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Elon Musk
@elonmusk · Oct 14, 2019
Replying to @aquastorm
Yes, we will
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