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SN8 steel type



 
 
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  #1  
Old October 10th 20, 10:20 PM posted to sci.space.policy
snidely
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Default SN8 steel type

After serious thinking JF Mezei wrote :
A couple of questions about various prototypes at Boca Chica.

SpaceX built two Sn7s with the new steel aloy to be destructively tested.

has SpaceX specified whether SN8 (which got chilled with liquid nitrogen
tonight) was built with the new steel alow, or still the old one ?


It was announced after SN7 that SN8 would be the new alloy. This
quote, from August 6, is from after the announcement:
"According to NASASpaceflight.com info, Starship SN8 – also the first
full-scale prototype to be built out of a different steel alloy – will
be the first ship to receive functional flaps and a nosecone. "
URL:https://www.teslarati.com/spacex-starship-sn8-elon-musk-next-steps/


/dps


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  #2  
Old October 10th 20, 11:41 PM posted to sci.space.policy
snidely
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Default SN8 steel type

On Saturday or thereabouts, Snidely asked ...
After serious thinking JF Mezei wrote :
A couple of questions about various prototypes at Boca Chica.

SpaceX built two Sn7s with the new steel aloy to be destructively tested.

has SpaceX specified whether SN8 (which got chilled with liquid nitrogen
tonight) was built with the new steel alow, or still the old one ?


It was announced after SN7 that SN8 would be the new alloy. This quote, from
August 6, is from after the announcement:
"According to NASASpaceflight.com info, Starship SN8 – also the first
full-scale prototype to be built out of a different steel alloy – will be the
first ship to receive functional flaps and a nosecone. "
URL:https://www.teslarati.com/spacex-starship-sn8-elon-musk-next-steps/


An update -- in the first Snate cryo stream, the Nasa SpaceFlight
reporters indicated that SN8 is a hybrid, per Elon's msgs [tweets?].

URL:https://youtu.be/eLe7Fa1iKf8?t=2377

You can probably search Elon's tweet history if you want to check
further.

/dps


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Well hung: curricle-hung in fact. Come sit by me and we'll test the
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  #3  
Old October 12th 20, 12:47 PM posted to sci.space.policy
Dean Markley
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Posts: 515
Default SN8 steel type

On Sunday, October 11, 2020 at 7:37:45 PM UTC-4, JF Mezei wrote:
On 2020-10-10 18:41, Snidely wrote:

An update -- in the first Snate cryo stream, the Nasa SpaceFlight
reporters indicated that SN8 is a hybrid, per Elon's msgs [tweets?].

Strange. Also, strange that they started building SN8 with the new
material before SN7 was tested. By the time SN7 was tested to failure,
SN8 was already built. So improvements made with SN7.1 which did pass
the tests (apparently) couldn't have been given to already built SN8.
There is only so much retroactive welding you can do.


Also, they found leaks in SN8 which had to be fixed. Surprised that by
now, they haven't develop an ISO 9000 type of procedures to ensure welds
are strong and perfect from the start without having to test to see
where the leaks are and whether the thing will pop when filled.

I'll have to hunt for Elon's tweets to see what he said. (Most of his
traffic is responding to individuals, so following him doesn't show
those responses).

SN8 was started before SN7 was tested because that's how iterative development works. As far as leaks, you are assuming they are at welds. That is not necessarily so.
  #4  
Old October 13th 20, 12:40 AM posted to sci.space.policy
snidely
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Posts: 1,303
Default SN8 steel type

On Saturday or thereabouts, Snidely declared ...
On Saturday or thereabouts, Snidely asked ...
After serious thinking JF Mezei wrote :
A couple of questions about various prototypes at Boca Chica.

SpaceX built two Sn7s with the new steel aloy to be destructively tested.

has SpaceX specified whether SN8 (which got chilled with liquid nitrogen
tonight) was built with the new steel alow, or still the old one ?


It was announced after SN7 that SN8 would be the new alloy. This quote,
from August 6, is from after the announcement:
"According to NASASpaceflight.com info, Starship SN8 – also the first
full-scale prototype to be built out of a different steel alloy – will be
the first ship to receive functional flaps and a nosecone. "
URL:https://www.teslarati.com/spacex-starship-sn8-elon-musk-next-steps/


An update -- in the first Snate cryo stream, the Nasa SpaceFlight reporters
indicated that SN8 is a hybrid, per Elon's msgs [tweets?].

URL:https://youtu.be/eLe7Fa1iKf8?t=2377

You can probably search Elon's tweet history if you want to check further.


I'm going to guess that the skirt is the old alloy and the tanks are
the new alloy, but I don't have any cite for that.

/dps

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