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SpaceX - Tests, Launches, Developments - 2020

Posted: Wed Jan 08, 2020 8:39 pm
by atcsundevil
Please continue from the previous thread.

viewtopic.php?p=21913771

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Fri Jan 10, 2020 11:18 am
by zanl188
‘The fairing deploys a parafoil and has the ability to manipulate it to control descent rate and direction. You can find videos of tests and some of the near misses where it's under the chute.“

Yes, but those facts are already in evidence. I’m looking for the underlying tech that makes recovery work. Tech, which apparently, isn’t working as well as hoped.

Surely SpaceX is not just hoping that the net and the fairing just happen to end up in the same place at the same time.

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Fri Jan 10, 2020 7:35 pm
by Nomadd
The Starship Pathfinder tank at Boca Chica had a short life. It was only assembled (for the 2nd time) yesterday.

Image

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Fri Jan 10, 2020 9:16 pm
by Tugger
Nomadd wrote:
The Starship Pathfinder tank at Boca Chica had a short life. It was only assembled (for the 2nd time) yesterday.

Image

Well THAT doesn't look right.... Do they test it under vacuum or something?

Tugg

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Sat Jan 11, 2020 5:37 am
by Nomadd
Tugger wrote:
Nomadd wrote:
The Starship Pathfinder tank at Boca Chica had a short life. It was only assembled (for the 2nd time) yesterday.

Well THAT doesn't look right.... Do they test it under vacuum or something?

Tugg

That's what I thought, but Elon said welds failed at 7.1 bar. Close to the 8.4 bar (6 bar + 40% margin) they needed. They hope to meet specs with a little better fabrication techniques.

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Sun Jan 12, 2020 2:55 am
by ThePointblank
Good test-fire of the Falcon 9 ahead of the in-flight abort test of Crewed Dragon, with a no earlier launch date of January 18th:

https://spaceflightnow.com/2020/01/11/s ... bort-test/

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Tue Jan 14, 2020 3:06 am
by Francoflier
Can't wait for that launch. That should be pretty spectacular.

Tugger wrote:
Well THAT doesn't look right.... Do they test it under vacuum or something?


I wonder if they are encountering the same issues as the early Atlas rockets whose integral stainless steel tanks had to be kept pressurized to retain their shape...

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Tue Jan 14, 2020 5:32 am
by JHwk
Tugger wrote:
Nomadd wrote:
The Starship Pathfinder tank at Boca Chica had a short life. It was only assembled (for the 2nd time) yesterday.

Image

Well THAT doesn't look right.... Do they test it under vacuum or something?

Tugg

Hydrostatic test; deformation likely happened when water above created a partial vacuum when it failed.

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Wed Jan 15, 2020 2:51 am
by Francoflier
JHwk wrote:
Tugger wrote:
Nomadd wrote:
The Starship Pathfinder tank at Boca Chica had a short life. It was only assembled (for the 2nd time) yesterday.

Image

Well THAT doesn't look right.... Do they test it under vacuum or something?

Tugg

Hydrostatic test; deformation likely happened when water above created a partial vacuum when it failed.



I watched the grainy video of the test and you're absolutely right.
It was filled with water, failed at the welds at 7.1 bars, then as the water flowed out of the welds on the side it created a vacuum at the top.
Not a bad test overall then.

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Sat Jan 18, 2020 10:36 am
by zanl188
Inflight launch abort test has been scrubbed for today due to recovery area weather. Next attempt same time tomorrow.

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Sun Jan 19, 2020 3:39 pm
by SRQLOT
Congrats SpaceX!!!!!!!! So exciting to see the whole event live on tv!!! Very exciting, now will have to see a launch on the other coast!!!

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Sun Jan 19, 2020 3:45 pm
by zanl188
Inflight abort test was uneventful. Congrats SpaceX!

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Sun Jan 19, 2020 3:47 pm
by flyingturtle
That was amazing to watch! Especially the detonation of the booster...

Hi... God... was I a good booster?

No, B1046. You were the best booster.

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Sun Jan 19, 2020 4:00 pm
by zanl188
For those that missed the test...

https://youtu.be/RIViYmnknZQ

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Sun Jan 19, 2020 4:06 pm
by JetBuddy
It's interesting the Falcon 9 booster exploded.

Just prior to the launch, the SpaceX guy said they had run simulations and it was expected to disintegrate. And that they had ships ready to pick up the debris.

I think they learned quite a lot from this test, not only about the launch escape system, but also the structural integrity of the F9 booster itself.

Congrats SpaceX for a successful test!

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Sun Jan 19, 2020 8:10 pm
by zanl188
Booster didn’t so much explode as catch fire.

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Sun Jan 19, 2020 8:26 pm
by zanl188
Post flight press conference

https://youtu.be/ggxhLa2xJOA

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Sun Jan 19, 2020 8:33 pm
by GDB
Well done Space X.
Hopefully crew riding that bird soon.
And as ever, great fun to watch, even during the tenser moments.

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Mon Jan 20, 2020 3:34 am
by Nomadd
The first stage exploded, pretty much as expected. Unexpectedly, the second stage stayed intact until it hit the water, and blew up then.

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Mon Jan 20, 2020 7:38 pm
by ZaphodHarkonnen
JetBuddy wrote:
It's interesting the Falcon 9 booster exploded.

Just prior to the launch, the SpaceX guy said they had run simulations and it was expected to disintegrate. And that they had ships ready to pick up the debris.

I think they learned quite a lot from this test, not only about the launch escape system, but also the structural integrity of the F9 booster itself.

Congrats SpaceX for a successful test!


It more ripped itself apart from aerodynamic stress as expected. The RP1 and LOX then mixed, found an ignition source, and turned into a fireball. That had no real guarantee of happening. Looked amazing though. O_O

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Mon Jan 20, 2020 11:50 pm
by Francoflier
I thought the second stage was going to be a dummy with no fuel or engine, yet it the fireball it made on impact seems to indicate there was indeed fuel in it...

Why did they use a functional second stage if they knew it wasn't going to be needed?

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Tue Jan 21, 2020 12:26 am
by ZaphodHarkonnen
Francoflier wrote:
I thought the second stage was going to be a dummy with no fuel or engine, yet it the fireball it made on impact seems to indicate there was indeed fuel in it...

Why did they use a functional second stage if they knew it wasn't going to be needed?


It wasn't fully functional as it had a mass simulator in place of the engine. From my understanding they filled it up with the real stuff as swapping it out for something like water simply wasn't worth the effort of putting different stuff through the piping then cleaning it for the following launch. Sometimes keeping it simple, if a touch wasteful, is the better overall option. Scott Manley touches on it in his video about the launch.

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Tue Jan 21, 2020 3:12 am
by ThePointblank
The truck from the inflight abort test was fished out of the water, and is in good shape, per Elon Musk:

https://twitter.com/elonmusk/status/1219340904407977984

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Tue Jan 21, 2020 4:05 pm
by Nomadd
Francoflier wrote:
I thought the second stage was going to be a dummy with no fuel or engine, yet it the fireball it made on impact seems to indicate there was indeed fuel in it...

Why did they use a functional second stage if they knew it wasn't going to be needed?

It had a mass simulator in place of an engine, but filling the tanks with liquid ballast wouldn't have worked. You need fuel the same density as the methane and LOX or you'd have partially filled, sloshing tanks and the balance would have been screwed up. You'd also have to completely change the ground equipment to handle a different fluid. Pumps and lines would all be wrong. Solid ballast wasn't practical because you can't add it until the rocket is assembled and erected on the pad. Testing as they flew was by far the easiest and safest choice.

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Thu Jan 23, 2020 5:13 pm
by Tugger
Some great pictures of the launch and separation are available at:
https://www.space.com/spacex-crew-drago ... hotos.html

This one I like best:
Image

Tugg

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Wed Jan 29, 2020 3:27 pm
by Francoflier
It looks like 60 more Starlink satellites are on the way to clog up low Earth orbit:

https://www.youtube.com/watch?v=0cNn7fg0GSA

Cool feed of the landing too. Looks like those crush cores will require servicing...
Third flight and landing for booster 1051.

Meanwhile, over in Boca Chica, the Starship team continues to have fun with stainless steel tanks:

https://www.youtube.com/watch?v=2TDaMCMEc8Q

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Fri Jan 31, 2020 11:28 am
by flyingturtle
Huh, hm, does anybody know why the Crew Dragon test - the one with the volunteers on board - has been delayed from February to April? I thought the crew abort test went perfectly and didn't raise any new issues...

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Fri Jan 31, 2020 11:39 am
by ThePointblank
flyingturtle wrote:
Huh, hm, does anybody know why the Crew Dragon test - the one with the volunteers on board - has been delayed from February to April? I thought the crew abort test went perfectly and didn't raise any new issues...

I believe NASA is seriously considering making the Demo-2 mission an extended stay mission, which would require additional training on the part of the crew.

Re: SpaceX - Tests, Launches, Developments - 2020

Posted: Fri Jan 31, 2020 7:40 pm
by Nomadd
flyingturtle wrote:
Huh, hm, does anybody know why the Crew Dragon test - the one with the volunteers on board - has been delayed from February to April? I thought the crew abort test went perfectly and didn't raise any new issues...

It's scheduled for May because NASA can't change a lightbulb without 4 months of analysis first.