Poll

Should IPD be considered on the timeline of the Raptor development?

Yes, IPD milestones directly flowed into Raptor.
5 (15.6%)
Yes, But only include the milestones I'll post about.
1 (3.1%)
Yes, But only as a general disclaimer at the beginning of the timeline.
10 (31.3%)
No, IPD milestones flowed into Raptor but all technology builds on past technology.
8 (25%)
No.
8 (25%)

Total Members Voted: 32

Voting closed: 08/25/2020 07:14 pm


Author Topic: SpaceX Raptor engine - General Thread 2  (Read 1288224 times)

Offline Inoeth

Re: SpaceX Raptor engine - General Thread 2
« Reply #340 on: 06/17/2019 04:31 am »
Did something go wrong with Raptor SN5? Why is Elon’s latest tweet saying they are waiting for engine “repair?”

We don't know any details- we assume it's SN 5 which was reportedly undergoing testing at McGreggor but beyond that there's no official info beyond Elon's latest tweet... repaired and not a new build seems like they over did it and damaged something - perhaps with extended firing or trying to ramp up to a higher chamber pressure or something...

Hopefully we'll get more details in the coming days and weeks... especially with the presentation (now NET early next month from that tweet it seems like)

Offline First Mate Rummey

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Re: SpaceX Raptor engine - General Thread 2
« Reply #341 on: 06/17/2019 10:04 am »
Do you know the fate of earlier engines? SN1 was definitively damaged IIRC, but what happened to the others?

Offline Robotbeat

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Re: SpaceX Raptor engine - General Thread 2
« Reply #342 on: 06/17/2019 10:40 am »
Did something go wrong with Raptor SN5? Why is Elon’s latest tweet saying they are waiting for engine “repair?”

We don't know any details- we assume it's SN 5 which was reportedly undergoing testing at McGreggor but beyond that there's no official info beyond Elon's latest tweet... repaired and not a new build seems like they over did it and damaged something - perhaps with extended firing or trying to ramp up to a higher chamber pressure or something...

Hopefully we'll get more details in the coming days and weeks... especially with the presentation (now NET early next month from that tweet it seems like)
Has anyone checked in L2?
Chris  Whoever loves correction loves knowledge, but he who hates reproof is stupid.

To the maximum extent practicable, the Federal Government shall plan missions to accommodate the space transportation services capabilities of United States commercial providers. US law http://goo.gl/YZYNt0

Offline M.E.T.

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Re: SpaceX Raptor engine - General Thread 2
« Reply #343 on: 06/17/2019 10:51 am »
Did something go wrong with Raptor SN5? Why is Elon’s latest tweet saying they are waiting for engine “repair?”

We don't know any details- we assume it's SN 5 which was reportedly undergoing testing at McGreggor but beyond that there's no official info beyond Elon's latest tweet... repaired and not a new build seems like they over did it and damaged something - perhaps with extended firing or trying to ramp up to a higher chamber pressure or something...

Hopefully we'll get more details in the coming days and weeks... especially with the presentation (now NET early next month from that tweet it seems like)
Has anyone checked in L2?

Given that ChrisB himself pondered this issue on Twitter today, I am guessing there is no info yet in L2 either.

Offline Star One

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Re: SpaceX Raptor engine - General Thread 2
« Reply #344 on: 06/17/2019 11:11 am »
Did something go wrong with Raptor SN5? Why is Elon’s latest tweet saying they are waiting for engine “repair?”

We don't know any details- we assume it's SN 5 which was reportedly undergoing testing at McGreggor but beyond that there's no official info beyond Elon's latest tweet... repaired and not a new build seems like they over did it and damaged something - perhaps with extended firing or trying to ramp up to a higher chamber pressure or something...

Hopefully we'll get more details in the coming days and weeks... especially with the presentation (now NET early next month from that tweet it seems like)
Has anyone checked in L2?

Given that ChrisB himself pondered this issue on Twitter today, I am guessing there is no info yet in L2 either.

And what would the point be being as L2 info isn’t generally posted on the public side unless made public by those concerned.

Offline Robotbeat

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Re: SpaceX Raptor engine - General Thread 2
« Reply #345 on: 06/17/2019 11:20 am »
I’m just plugging L2. Dont anyone actually leak L2 info, please.
Chris  Whoever loves correction loves knowledge, but he who hates reproof is stupid.

To the maximum extent practicable, the Federal Government shall plan missions to accommodate the space transportation services capabilities of United States commercial providers. US law http://goo.gl/YZYNt0

Offline M.E.T.

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Re: SpaceX Raptor engine - General Thread 2
« Reply #346 on: 06/17/2019 11:24 am »
Did something go wrong with Raptor SN5? Why is Elon’s latest tweet saying they are waiting for engine “repair?”

We don't know any details- we assume it's SN 5 which was reportedly undergoing testing at McGreggor but beyond that there's no official info beyond Elon's latest tweet... repaired and not a new build seems like they over did it and damaged something - perhaps with extended firing or trying to ramp up to a higher chamber pressure or something...

Hopefully we'll get more details in the coming days and weeks... especially with the presentation (now NET early next month from that tweet it seems like)
Has anyone checked in L2?

Given that ChrisB himself pondered this issue on Twitter today, I am guessing there is no info yet in L2 either.

And what would the point be being as L2 info isn’t generally posted on the public side unless made public by those concerned.

Apologies, I didn’t get your meaning with this post. I was just saying that ChrisB asked the same question today on Twitter. Which he surely would not be asking if the answer was already in L2.

Offline rsdavis9

Re: SpaceX Raptor engine - General Thread 2
« Reply #347 on: 06/17/2019 01:58 pm »
I'm guessing SN5 had a problem that caused it to shutdown(abort) but it wasn't physical damage to the fuel path. Maybe control stuff. Valves, electronics, etc.
With ELV best efficiency was the paradigm. The new paradigm is reusable, good enough, and commonality of design.
Same engines. Design once. Same vehicle. Design once. Reusable. Build once.

Offline Karloss12

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Re: SpaceX Raptor engine - General Thread 2
« Reply #348 on: 06/21/2019 08:15 pm »
It now sounds like SN5 is permanently out of action and SN6 is the engine to look out for.

Offline OxCartMark

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Re: SpaceX Raptor engine - General Thread 2
« Reply #349 on: 06/21/2019 09:13 pm »
I'm guessing SN5 had a problem that caused it to shutdown(abort) but it wasn't physical damage to the fuel path. Maybe control stuff. Valves, electronics, etc.

If not physical damage then why would they not make a corrective adjustment or modification and continue testing?
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Offline OxCartMark

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Re: SpaceX Raptor engine - General Thread 2
« Reply #350 on: 06/21/2019 09:19 pm »
Does anyone know the maximum amount of time that a Raptor can be run at full thrust at McGregor before the storage tanks are depleted?
Actulus Ferociter!

Offline Norm38

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Re: SpaceX Raptor engine - General Thread 2
« Reply #351 on: 06/22/2019 03:38 am »
Just throwing this out there.  There are ways that a big heavy engine could be damaged just by moving it around. Or strip some threads.
Did anyone actually say it was damaged by firing it?

Offline blasphemer

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Re: SpaceX Raptor engine - General Thread 2
« Reply #352 on: 06/22/2019 07:30 am »
Why is there so little coverage of these Raptor engine tests on the space internet? There are multiple live webcams pointed at Boca Chica facilities and daily dump of photos and videos, but I see almost nothing from McGregor, despite the town being 5km from test site. Shouldnt loud and spectacular engine tests attract much more attention?
« Last Edit: 06/22/2019 07:32 am by blasphemer »

Offline aaminotti

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Re: SpaceX Raptor engine - General Thread 2
« Reply #353 on: 06/22/2019 07:33 am »
Why is there so little coverage of these Raptor engine tests on the space internet? There are multiple live webcams pointed at Boca Chica facilities and daily dump of photos and videos, but I see almost nothing from McGregor, despite the town being 5km from test site. Shouldnt loud and spectacular engine tests attract much more attention?
Agreed. There's not videos or photos like Boca Chica from McGregor?

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Offline Spindog

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Re: SpaceX Raptor engine - General Thread 2
« Reply #354 on: 06/22/2019 09:25 pm »
Does anyone know the maximum amount of time that a Raptor can be run at full thrust at McGregor before the storage tanks are depleted?

I dont recall hearing of development subscale raptor tests lasting more than 60 seconds or less. They would surely have to upgrade fuel (and oxidizer?) storage to run a full size raptor much more than 20 seconds. But absolutely no news on any actual raptor runs in terms of length, thrust, or video for months now.

Offline RobLynn

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Re: SpaceX Raptor engine - General Thread 2
« Reply #355 on: 06/22/2019 10:17 pm »
Does anyone know the maximum amount of time that a Raptor can be run at full thrust at McGregor before the storage tanks are depleted?

I dont recall hearing of development subscale raptor tests lasting more than 60 seconds or less. They would surely have to upgrade fuel (and oxidizer?) storage to run a full size raptor much more than 20 seconds. But absolutely no news on any actual raptor runs in terms of length, thrust, or video for months now.

SpaceX has been fantastically transparent, Elon is promising a presentation after Hopper has done some hopping, so i imagine we will get a lot of insight as to what has been happening then.
The glass is neither half full nor half empty, it's just twice as big as it needs to be.

Offline Star One

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Re: SpaceX Raptor engine - General Thread 2
« Reply #356 on: 06/23/2019 10:45 am »
It seems like the increasing level of negativity I’ve noticed online about this whole enterprise is probably partly fuelled by how long Starhopper has been without a Raptor now because of all the delays with their testing and changing from intending to use one engine to another.

Offline Spindog

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Re: SpaceX Raptor engine - General Thread 2
« Reply #357 on: 06/23/2019 11:14 am »
I'm not sure I'd say its negativity. More like mild disappointment that, for whatever the reason, they apparently haven't been able to meet Elon's 'aspirational' schedule. I try to keep in mind that, though they were ahead in many ways with the original subscale raptor, the final version is, as Elon described, radically redesigned. Taking a while to test and tune and fine tune is not unsurprising.

Offline speedevil

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Re: SpaceX Raptor engine - General Thread 2
« Reply #358 on: 06/23/2019 11:34 am »
I'm not sure I'd say its negativity. More like mild disappointment that, for whatever the reason, they apparently haven't been able to meet Elon's 'aspirational' schedule. I try to keep in mind that, though they were ahead in many ways with the original subscale raptor, the final version is, as Elon described, radically redesigned. Taking a while to test and tune and fine tune is not unsurprising.
It would not surprise me if the delay is due to 'off nominal' operations - that is - they've got it working at 170 tonnes and think they can get it to 200+ repeatably.
If they can get this down before serial production begins, then they can reduce the number of engines they need in SH by 5%.
Of course, it could just be that Joe is dropping them. (random name)

Offline JamesH65

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Re: SpaceX Raptor engine - General Thread 2
« Reply #359 on: 06/23/2019 09:11 pm »
It seems like the increasing level of negativity I’ve noticed online about this whole enterprise is probably partly fuelled by how long Starhopper has been without a Raptor now because of all the delays with their testing and changing from intending to use one engine to another.

The internet is full of impatient people who have no understanding of the complexities involved. Many seem to think its a god* given right for them to be spoon fed every scrap of information as soon as something happens. There's very little SpaceX can do or say to stop such negativity from the impatient uninformed.



* Please insert appropriate deity here.


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