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Everyday Astronaut
@Erdayastronaut · Sep 9, 2019
But surely not in miliseconds like opening a set of valves in a hypergolic abort system (ie superdracos)... What do you use to spin up the turbines? Helium?
Elon Musk
@elonmusk · Sep 9, 2019
Distance from fireball is 0.5*a*t^2, so if t is small, you haven’t moved far even if a is high. At ~6g thrust, you’ll only travel ~0.03m in 100 ms. Pressure wave (aka explosion) with liquid rockets is low, as ox & fuel are poorly mixed. If you can fly out of it, you’re prob ok.
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Everyday Astronaut
@Erdayastronaut · Sep 9, 2019
I rely on my office chair to hold my butt 2' off the ground at all times. It's *so far* been 100% reliable in doing so. There was a time when chairs weren't 100% reliable 😉 and based on failarmy videos, there's still plenty that do. I just buy nice enough ones to not fail.
Elon Musk
@elonmusk · Sep 9, 2019
🤣🤣
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Elon Musk
@elonmusk · Sep 9, 2019
Everything happens so fast. It’s such a different paradigm that applying aircraft concepts to rockets is almost like applying shipping concepts to aircraft. Travels 10,000 km in 30 mins.
Elon Musk
@elonmusk · Sep 9, 2019
You know destination weather before departure & there’s no weather in space
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Elon Musk
@elonmusk · Sep 9, 2019
Replying to @flcnhvy
Everything happens so fast. It’s such a different paradigm that applying aircraft concepts to rockets is almost like applying shipping concepts to aircraft. Travels 10,000 km in 30 mins.
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Scott Manley
@DJSnM · Sep 9, 2019
Have you figured out how a pad abort for Starship would work when you need the 3 vacuum optimized engines to lift the fully fueled starship. Do you just accept the rough unstable burn of the vacuum engines? Or have a pyrotechnic that shears off nozzle extension in emergency?
Elon Musk
@elonmusk · Sep 9, 2019
Not currently planning for pad abort with early Starships, but maybe we should. Vac engines would be dual bell & fixed (no gimbal), which means we can stabilize nozzle against hull.
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Everyday Astronaut
@Erdayastronaut · Sep 9, 2019
I truly can't imagine Raptor could spin up fast enough to function as an abort system of any kind. I think we can all agree there's some added complexity and risk in HAVING an abort system. I think Starship is hoping to be reliable enough to forgo an abort system.
Elon Musk
@elonmusk · Sep 9, 2019
Raptor turbines can spin up extremely fast. We take it easy on the test stand, but that’s not indicative of capability.
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Everyday Astronaut
@Erdayastronaut · Sep 9, 2019
Well CRAP... I had 350 for sea level raptor AT sea level and 370s for SL in a vacuum. Dang it... time to fix my voice over 🙈
Elon Musk
@elonmusk · Sep 9, 2019
Over time, 355 & 385 are possible, but very difficult
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Anthony Iemole 🇺🇦
@SpaceXFan97 · Sep 9, 2019
How will vacuum Raptors be tested? If I remember correctly MVacs are tested without the nozzle attached. Would Raptor be the same?
Elon Musk
@elonmusk · Sep 9, 2019
Most likely
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Eva Fo𝕏 🦊 Claudius Nero's Legion
@EvaFox · Sep 9, 2019
Real life 🤷🏼♀️
Elon Musk
@elonmusk · Sep 9, 2019
Photoshop is amazing
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Everyday Astronaut
@Erdayastronaut · Sep 9, 2019
Raptor couldn't do SSTO on that vehicle most likely. The RS-2200 was going to have 455s in a vacuum vs Sea Level Raptor's 370s. But with similar power as the RS-2200, there'd need to be 7 of them to get it off the ground.
Elon Musk
@elonmusk · Sep 9, 2019
Sea level Raptor’s vacuum Isp is ~350 sec, but ~380 sec with larger vacuum-optimized nozzle
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Everyday Astronaut
@Erdayastronaut · Sep 9, 2019
It’d be so sick if a starship could be a zeppelin on Venus 🤔 QUICK, someone run the bouancy numbers!!!
Elon Musk
@elonmusk · Sep 9, 2019
For sure
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Pauline 🚀
@justpaulinelol · Sep 9, 2019
@elonmusk
Elon Musk
@elonmusk · Sep 9, 2019
Actually true
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Elon Musk
@elonmusk · Sep 9, 2019
Replying to @flcnhvy
Ceres, Callisto, Ganymede & Titan
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Elon Musk
@elonmusk · Sep 9, 2019
And flights of angels sing thee to thy rest
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Eva Fo𝕏 🦊 Claudius Nero's Legion
@EvaFox · Sep 9, 2019
@elonmusk
Elon Musk
@elonmusk · Sep 9, 2019
Deep lore
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Dragos Stanca
@dStanca · Sep 9, 2019
Why don’t you come over (in Romania) and have a chat live on this - and also Tesla’s plans for the region? ;) Check this out upgrade100.com
Elon Musk
@elonmusk · Sep 9, 2019
Hoping to open in Romania soon!
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Nazmi TARIM
@tarimnazmi · Sep 9, 2019
We want to see Mars like this. pic.x.com/0LwDlfAA6z
Elon Musk
@elonmusk · Sep 9, 2019
Definitely
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Elon Musk
@elonmusk · Sep 9, 2019
Probability that we’re in base Polytopia is highly unlikely - KWM
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Mike Hudema
@MikeHudema · Sep 9, 2019
BAM! #Amsterdam to ban all petrol and diesel cars and motorbikes by 2030
We have solutions to the #climate crisis. Time for a wholistic plan to implement them. Sign on today: buff.ly/2WrJ7R1 #GreenNewDeal
#ActOnClimate #climate #energy #cdnpoli #bcpoli @GretaThunberg
Elon Musk
@elonmusk · Sep 9, 2019
Wow cool
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Elon Musk
@elonmusk · Sep 9, 2019
Why aren’t more people talking about this!?
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