POGO: The 63-Year-Old Problem Threatening Starship's Success

[xvel]

"Human sacrifice, pots and kettles living together....  Mass hysteria!"

I always thought the quote from Ghost Busters was:

"Human sacrifice, cats and dogs living together... Mass hysteria!"

It is, and I know.  Read the rest of it.   


Also, it's Ghostbusters (one word, no capital B).

Not getting the kettles and pot references sorry, but nice to understand you did it intentionally :-)

I'm too ingrained into fixing wavy red lined words. Ghostbusters is obviously the correct form :-D

Back to the topic (and my bad). Is the consensus that the Pogo problem is resolved based on the latest flight, or are people waiting to see the analysis of what went wrong?

Spacex never said that there were problems with pogo oscillations, they said "harmonic response" which is much broader and vague term, pogo was pure speculation, so the question is baseless and can't be answered.

[BN]

"Human sacrifice, pots and kettles living together....  Mass hysteria!"

I always thought the quote from Ghost Busters was:

"Human sacrifice, cats and dogs living together... Mass hysteria!"

It is, and I know.  Read the rest of it.   


Also, it's Ghostbusters (one word, no capital B).

Not getting the kettles and pot references sorry, but nice to understand you did it intentionally :-)

I'm too ingrained into fixing wavy red lined words. Ghostbusters is obviously the correct form :-D

Back to the topic (and my bad). Is the consensus that the Pogo problem is resolved based on the latest flight, or are people waiting to see the analysis of what went wrong?

Spacex never said that there were problems with pogo oscillations, they said "harmonic response" which is much broader and vague term, pogo was pure speculation, so the question is baseless and can't be answered.

I wonder if harmonics could explain some of the tiles popping off. Elon mentioned in an interview today that they haven't actually figured out why certain tiles fall off.

[InterestedEngineer]

"Human sacrifice, pots and kettles living together....  Mass hysteria!"

I always thought the quote from Ghost Busters was:

"Human sacrifice, cats and dogs living together... Mass hysteria!"

It is, and I know.  Read the rest of it.   


Also, it's Ghostbusters (one word, no capital B).

Not getting the kettles and pot references sorry, but nice to understand you did it intentionally :-)

I'm too ingrained into fixing wavy red lined words. Ghostbusters is obviously the correct form :-D

Back to the topic (and my bad). Is the consensus that the Pogo problem is resolved based on the latest flight, or are people waiting to see the analysis of what went wrong?

Spacex never said that there were problems with pogo oscillations, they said "harmonic response" which is much broader and vague term, pogo was pure speculation, so the question is baseless and can't be answered.

I wonder if harmonics could explain some of the tiles popping off. Elon mentioned in an interview today that they haven't actually figured out why certain tiles fall off.

tiles, feeds to thrusters, all sorts of stuff can have harmonic response.

Just the fact that V2 is longer makes the harmonic response different.  Any rigid item such as plumbing will harmonically oscillate at some frequency dependent on acceleration, input oscillation, length, characteristic "stiffness" of the material, etc.

[rsdavis9]

I think I heard the Hertz of the resonance is around 10 Hz. Low frequency like that would not make tiles fall off.
But it would put a lot of stress on plumbing.

[Twark_Main]

"Human sacrifice, pots and kettles living together....  Mass hysteria!"

I always thought the quote from Ghost Busters was:

"Human sacrifice, cats and dogs living together... Mass hysteria!"

It is, and I know.  Read the rest of it.   


Also, it's Ghostbusters (one word, no capital B).

Not getting the kettles and pot references sorry, but nice to understand you did it intentionally :-)

I'm too ingrained into fixing wavy red lined words. Ghostbusters is obviously the correct form :-D

Back to the topic (and my bad). Is the consensus that the Pogo problem is resolved based on the latest flight, or are people waiting to see the analysis of what went wrong?

Spacex never said that there were problems with pogo oscillations, they said "harmonic response" which is much broader and vague term, pogo was pure speculation, so the question is baseless and can't be answered.

I wonder if harmonics could explain some of the tiles popping off. Elon mentioned in an interview today that they haven't actually figured out why certain tiles fall off.

tiles, feeds to thrusters, all sorts of stuff can have harmonic response.

Just the fact that V2 is longer makes the harmonic response different.  Any rigid item such as plumbing will harmonically oscillate at some frequency dependent on acceleration, input oscillation, length, characteristic "stiffness" of the material, etc.

Longer should make the frequency lower, which is generally not a good thing. Usually you try to make the natural frequency higher than your vibration spectrogram.

[JamesH65]

Oh dear, it wasn't POGO

That's an awful lot of time and mental energy that's been spent unnecessarily by the community on guessing why the flight 8 changes didn't fix the problem, and what to do about it.

I guess we can consider it time well spent as it kept us entertained while not a lot seemed to be happening.

so what will the community think if ship explodes again on a similar timeframe next week.

1. It doesn't matter what the community thinks.
2. See 1.

Uh, aren't you a member of the community? 

"Human sacrifice, pots and kettles living together....  Mass hysteria!"

I am.
And it doesn't matter what I think.

[BN]

Oh dear, it wasn't POGO

That's an awful lot of time and mental energy that's been spent unnecessarily by the community on guessing why the flight 8 changes didn't fix the problem, and what to do about it.

I guess we can consider it time well spent as it kept us entertained while not a lot seemed to be happening.

so what will the community think if ship explodes again on a similar timeframe next week.

1. It doesn't matter what the community thinks.
2. See 1.

Uh, aren't you a member of the community? 

"Human sacrifice, pots and kettles living together....  Mass hysteria!"

I am.
And it doesn't matter what I think.

that's just like your opinion man

[zubenelgenubi]

Moderator:

Quoting Don Rickles: Anyways, gang...

Discussion has played out.  Locking thread. 🔒

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