Posts
Elon Musk
@elonmusk · Feb 5, 2021
Replying to @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 · Feb 5, 2021
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 · Feb 5, 2021
Higher Isp too
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Everyday Astronaut
@Erdayastronaut · Feb 5, 2021
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 · Feb 5, 2021
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 · Feb 4, 2021
Here's what @elonmusk means by this tweet.
Elon Musk@elonmusk· Feb 4, 2021@josh_bickett @ajtourville @Erdayastronaut @SpaceX Yeah. By default, engine with least lever arm would shut down if all 3 are good.
Elon Musk
@elonmusk · Feb 4, 2021
Yes
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@mikko
@mikko · Feb 4, 2021
Elon loves Darude and Lordi. x.com/elonmusk/statu…
Elon Musk@elonmusk· May 7, 2019Been wanting to go ever since that Finnish metal band won
Elon Musk
@elonmusk · Feb 4, 2021
It’s true!
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Josh
@josh_bickett · Feb 4, 2021
So it will be determined which to cut off based on data available right after relight?
Elon Musk
@elonmusk · Feb 4, 2021
Yeah. By default, engine with least lever arm would shut down if all 3 are good.
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ALEX
@ajtourville · Feb 4, 2021
Wouldn't it be safer to light 3, and throttle 3 for landing just in case there's 1 engine failure?
Elon Musk
@elonmusk · Feb 4, 2021
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 · Feb 4, 2021
Replying to @Adamklotz_
Yes
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Everyday Astronaut
@Erdayastronaut · Feb 4, 2021
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 · Feb 4, 2021
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 · Feb 4, 2021
I am become meme,
Destroyer of shorts
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Elon Musk
@elonmusk · Feb 4, 2021
Replying to @commander_cruz
Might actually happen
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Elon Musk
@elonmusk · Feb 4, 2021
Sandstorm is a masterpiece
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MadOverlord
@MadOverlord · Feb 4, 2021
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 · Feb 4, 2021
We were too dumb
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Elon Musk
@elonmusk · Feb 4, 2021
Next time, we try pull *up* method
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Elon Musk
@elonmusk · Feb 4, 2021
Low-key Loki
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Elon Musk
@elonmusk · Feb 4, 2021
No highs, no lows, only Doge
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Elon Musk
@elonmusk · Feb 4, 2021
Dogecoin is the people’s crypto
Elon Musk
@elonmusk · Feb 4, 2021
No need to be a gigachad to own
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Elon Musk
@elonmusk · Feb 4, 2021
Dogecoin is the people’s crypto
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Elon Musk
@elonmusk · Feb 4, 2021
ur welcome
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HTX
@HTX_Global · Feb 4, 2021
Are you sure @elonmusk?
Elon Musk
@elonmusk · Feb 4, 2021
The most entertaining outcome is the most likely
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