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Elon Musk
@elonmusk · 5 февр. 2021 г.
Ответ на @Adamklotz_
Will still use hot gas maneuvering (RCS) thrusters, as ~5X more efficient than nitrogen (300 sec vs 60 sec Isp)
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Elon Musk
@elonmusk · 5 февр. 2021 г.
Intuitively, it would seem so, but turbopump-fed Raptors have much higher thrust & propellant mass fraction than pressure-fed gas thrusters & they’re already there
Elon Musk
@elonmusk · 5 февр. 2021 г.
Higher Isp too
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Everyday Astronaut
@Erdayastronaut · 5 февр. 2021 г.
Someday the leverage arm won’t matter as much when you go to hot gas thrusters though, right? Those will become a powerful source for the flip and the engines won’t be as necessary, right? Or will the engines always light to aid in the flip even with hot gas thrusters?
Elon Musk
@elonmusk · 5 февр. 2021 г.
Intuitively, it would seem so, but turbopump-fed Raptors have much higher thrust & propellant mass fraction than pressure-fed gas thrusters & they’re already there
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Brendan
@_brendan_lewis · 4 февр. 2021 г.
Here's what @elonmusk means by this tweet.
Elon Musk@elonmusk· 4 февр. 2021 г.@josh_bickett @ajtourville @Erdayastronaut @SpaceX Yeah. By default, engine with least lever arm would shut down if all 3 are good.
Elon Musk
@elonmusk · 4 февр. 2021 г.
Yes
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@mikko
@mikko · 4 февр. 2021 г.
Elon loves Darude and Lordi. x.com/elonmusk/statu…
Elon Musk@elonmusk· 7 мая 2019 г.Been wanting to go ever since that Finnish metal band won
Elon Musk
@elonmusk · 4 февр. 2021 г.
It’s true!
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Josh
@josh_bickett · 4 февр. 2021 г.
So it will be determined which to cut off based on data available right after relight?
Elon Musk
@elonmusk · 4 февр. 2021 г.
Yeah. By default, engine with least lever arm would shut down if all 3 are good.
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ALEX
@ajtourville · 4 февр. 2021 г.
Wouldn't it be safer to light 3, and throttle 3 for landing just in case there's 1 engine failure?
Elon Musk
@elonmusk · 4 февр. 2021 г.
Yes, but engines have a min throttle point where there is flameout risk, so landing on 3 engines means high thrust/weight (further away from hover point), which is also risky
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Elon Musk
@elonmusk · 4 февр. 2021 г.
Ответ на @Adamklotz_
Yes
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Everyday Astronaut
@Erdayastronaut · 4 февр. 2021 г.
Of course, @SpaceX isn't "dumb" as @elonmusk joked, but they definitely are trying to bite off a lot with these early test flights and there's certainly room for improvement. We'll go over how we'll likely see this maneuver evolve and what upgrades we'll see in the future.
Elon Musk
@elonmusk · 4 февр. 2021 г.
It was foolish of us not to start 3 engines & immediately shut down 1, as 2 are needed to land
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Elon Musk
@elonmusk · 4 февр. 2021 г.
I am become meme,
Destroyer of shorts
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Elon Musk
@elonmusk · 4 февр. 2021 г.
Ответ на @commander_cruz
Might actually happen
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Elon Musk
@elonmusk · 4 февр. 2021 г.
Sandstorm is a masterpiece
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MadOverlord
@MadOverlord · 4 февр. 2021 г.
Question: Why only light 2 engines for landing? Any engine failure means loss of vehicle, so you have two single points of failure. Why not light all 3, do the flip, then pick the best two and turn off the other?
Elon Musk
@elonmusk · 4 февр. 2021 г.
We were too dumb
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Elon Musk
@elonmusk · 4 февр. 2021 г.
Next time, we try pull *up* method
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Elon Musk
@elonmusk · 4 февр. 2021 г.
Low-key Loki
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Elon Musk
@elonmusk · 4 февр. 2021 г.
No highs, no lows, only Doge
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Elon Musk
@elonmusk · 4 февр. 2021 г.
Dogecoin is the people’s crypto
Elon Musk
@elonmusk · 4 февр. 2021 г.
No need to be a gigachad to own
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Elon Musk
@elonmusk · 4 февр. 2021 г.
Dogecoin is the people’s crypto
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Elon Musk
@elonmusk · 4 февр. 2021 г.
ur welcome
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HTX
@HTX_Global · 4 февр. 2021 г.
Are you sure @elonmusk?
Elon Musk
@elonmusk · 4 февр. 2021 г.
The most entertaining outcome is the most likely
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