Author Topic: SpaceX Starship : Texas Prototype(s) Thread 14 : Discussion  (Read 533979 times)

Offline Chris Bergin

New thread (14) for discussion of the Starship prototype being built in Boca Chica, Texas.  Previous posts on these prototypes can be found in these threads:

Discussion 1

Discussion 2

Discussion 3

Discussion 4

Discussion 5

Discussion 6

Discussion 7

Discussion 8

Discussion 9

Discussion 10

Discussion 11

Discussion 12

Discussion 13 (Previous)

Thread 14 - you're in it!

UPDATES:

SpaceX BFS : Phase 2 - Starship Orbital Prototype(s) - Photos and Updates -3 (Previous)

SpaceX Boca Chica - Production Updates - MASTER Thread (4) (New/Current)

Starship SN8 Test Launch - UPDATES (New/Current).

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« Last Edit: 11/28/2020 05:47 pm by Chris Bergin »
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Offline nameUnavailabl

https://forum.nasaspaceflight.com/index.php?topic=52205.msg2159367#msg2159367

The pipe's diameter is larger than [the downcomer's bottom section on] the thrust puck sitting next to them.

Offline nameUnavailabl

https://forum.nasaspaceflight.com/index.php?topic=52205.msg2159367#msg2159367

The pipe's diameter is larger than [the downcomer's bottom section on] the thrust puck sitting next to them.

Offline WiresMN

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This is the second thrust puck we have seen utilizing this configuration and there a few SS's in the works that need thrust domes, so my money is on another puck for a SS. EM stated a few days ago that there were bigger changes coming for SS15 and above.


Offline nameUnavailabl

Yes, the puck is for SS, maybe for SN16 as one with the same design has already arrived earlier.

And the pipes for SH downcomer.

MAYBE, this is what was holding SH stacking.
And as this is not in the whole one piece which can be because they might stack them while stacking each barrel section of LOX tank for easeness.

Let's wait and watch.

Offline gsa

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Sorry to interrupt this heated flamy/melty discussion. ;)
Is there a nosecone access hatch on SN9? Couldn't find it on any of pictures.
I guess this photo answers my question. :)
It also implies that SN9's nosecone is welded only from the outside.

Offline magnemoe

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Repeating an question do they need an methane header tank with the larger downcommer?
Having just an pipe with an valve on top will simplify stuff, for one you don't have too pump liquid methane from the main tank to the headers as the top of the old header tank was above the valves between main and header tank.
The LOX header tank is separate and you can always pump to top it up

Offline Okie_Steve

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Probably better asked on the engineering thread.

Offline xvel

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Repeating an question do they need an methane header tank with the larger downcommer?
Having just an pipe with an valve on top will simplify stuff, for one you don't have too pump liquid methane from the main tank to the headers as the top of the old header tank was above the valves between main and header tank.
The LOX header tank is separate and you can always pump to top it up

probably:
And God said: "Let there be a metric system". And there was the metric system.
And God saw that it was a good system.

Offline Crispy

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Repeating an question do they need an methane header tank with the larger downcommer?
Having just an pipe with an valve on top will simplify stuff, for one you don't have too pump liquid methane from the main tank to the headers as the top of the old header tank was above the valves between main and header tank.
The LOX header tank is separate and you can always pump to top it up

probably:

Ah, but:


Offline vaporcobra

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Re: SpaceX Starship : Texas Prototype(s) Thread 14 : Discussion
« Reply #10 on: 11/28/2020 10:24 pm »
As someone noted, Super Heavy needs much taller transfer tubes but... two tubes with a larger diameter were delivered :) SpaceX probably isn't going to ship a narrow, thin ~40m metal tube in one piece. Much more reasonable to, say, ship multiple segments from Hawthorne and complete the final weld or two after delivery.

Offline Paul_G



Ah, but:

When you fire up the engines using the closed off downcommer, would you be able to pressurise it enough so that you donít collapse the downcommer when you start sucking fuel? By keeping the header tank it seems easier to manage autogenous pressurization.

Offline Paul_G

Sorry to interrupt this heated flamy/melty discussion. ;)
Is there a nosecone access hatch on SN9? Couldn't find it on any of pictures.
I guess this photo answers my question. :)
It also implies that SN9's nosecone is welded only from the outside.

In todays video from Mary, at around the 3:13 mark, there seems to be one of those wide yellow forced air vent tubes going in to a hole on the right hand side of the worker at a slightly higher level - could there be an access hatch on the side?

Offline RoboGoofers

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Re: SpaceX Starship : Texas Prototype(s) Thread 14 : Discussion
« Reply #13 on: 11/28/2020 11:53 pm »
As someone noted, Super Heavy needs much taller transfer tubes but... two tubes with a larger diameter were delivered :) SpaceX probably isn't going to ship a narrow, thin ~40m metal tube in one piece. Much more reasonable to, say, ship multiple segments from Hawthorne and complete the final weld or two after delivery.
I don't understand why they need the downcomers preassembled at all. Is welding stainless pipe segments different from the rest of the stainless welding they're doing?

Offline aip

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Re: SpaceX Starship : Texas Prototype(s) Thread 14 : Discussion
« Reply #14 on: 11/29/2020 12:28 am »
I don't understand why they need the downcomers preassembled at all. Is welding stainless pipe segments different from the rest of the stainless welding they're doing?
I think the Boca Chica build site is best thought of as an assembly location, where the largest pieces possible are received and assembled into a Starship. The less work done at the site, the better, reducing the work required by the limited number of people that can work at the build site.

The only way to triple the number of people working on the Starship project is to outsource work. Even if they acquire every lot in Boca Chica, tripling the parking lot size AND the number of work stations just isn't possible at the site. But there are many oil & gas manufacturers in Texas with millions of square feet of under-utilized shop space that can build parts to spec for SpaceX.

Offline Kang54

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Re: SpaceX Starship : Texas Prototype(s) Thread 14 : Discussion
« Reply #15 on: 11/29/2020 12:57 am »
International interest is high (article by yours truly in today's edition of Danish newspaper Politiken)...
This looks interesting! I might have to buy a copy of Politiken tomorrow ;D.
« Last Edit: 11/29/2020 01:46 am by zubenelgenubi »

Offline TomH

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Re: SpaceX Starship : Texas Prototype(s) Thread 14 : Discussion
« Reply #16 on: 11/29/2020 05:24 am »
Business Insider article re the Environmental approvals given to SX in 2014 for Boca Chica, how progress at BC has deviated from the original plan, and discussion on whether environmental issues will become impediments before SS/SH can go orbital:

https://www.businessinsider.com/spacex-faa-boca-chica-texas-environmental-impact-statement-written-reevaluation-2020-10
« Last Edit: 11/29/2020 06:40 am by Chris Bergin »

Offline [email protected]

Sorry to interrupt this heated flamy/melty discussion. ;)
Is there a nosecone access hatch on SN9? Couldn't find it on any of pictures.
I guess this photo answers my question. :)
It also implies that SN9's nosecone is welded only from the outside.
I had found the fairing hatch location (© Bocachicagal). They had to welded the stiffners connecting two sections on the inside
« Last Edit: 11/29/2020 07:13 am by [email protected] »
My parents was just being born when the Apollo program is over. Why we are still stuck in this stagnation, let's go forward again

Offline gsa

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Re: SpaceX Starship : Texas Prototype(s) Thread 14 : Discussion
« Reply #18 on: 11/29/2020 09:16 am »
Is there a nosecone access hatch on SN9? Couldn't find it on any of pictures.
I guess this photo answers my question. :)
In todays video from Mary, at around the 3:13 mark, there seems to be one of those wide yellow forced air vent tubes going in to a hole on the right hand side of the worker at a slightly higher level - could there be an access hatch on the side?
It also implies that SN9's nosecone is welded only from the outside.

I had found the fairing hatch location (© Bocachicagal). They had to welded the stiffners connecting two sections on the inside
I think you both are right. I've already seen it in today's video also. Guess they couldn't decide which side to make the hatch on, so they did markings twice. :)
One thing is certain: the hatch was made inside the high bay. We've seen that spot many times before, it was empty.

Offline OTV Booster

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Re: SpaceX Starship : Texas Prototype(s) Thread 14 : Discussion
« Reply #19 on: 11/29/2020 02:09 pm »
As someone noted, Super Heavy needs much taller transfer tubes but... two tubes with a larger diameter were delivered :) SpaceX probably isn't going to ship a narrow, thin ~40m metal tube in one piece. Much more reasonable to, say, ship multiple segments from Hawthorne and complete the final weld or two after delivery.
It's hard to tell the length of that flatbed. Standard is 53ft (16.2m) but Texas allows 57ft (17.4m) trailers. Those tubes (4 actually) are ~.5m short of the tail end of the trailer and far enough from the front to leave room for the cone. The front tube on the far side is shorter than the others to help make room.

How solid is that 40m downcomer length? That's not the type of freight that would be stacked without more substantial crating. If we see at least one more segment ship in I'd say it's a lock on it being the SH downcomer.

Photo from BCG

« Last Edit: 11/29/2020 02:10 pm by OTV Booster »
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