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Early Access / Feedback Time! (Patreon)

Published:
2019-01-30 05:53:29
Imported:
2022-01

Content

This is intended to be the final for "Why SpaceX ditched lightweight carbon fiber for stainless steel on Starship" - give it 30 minutes or so (from now) to render before watching it. Let me know if you see any serious errors or urgent feedback at this point only at this point. Hoping to post this tomorrow!

Files

Stainless Steel VS CC 2

Comments

Big Car

Great new titles, and well researched!

Anonymous

You failed on the first transition after the title

Anonymous

Great job Tim! One thing you may wish to include is a chart showing the strength versus weight at ambient, cryogenic and re-entry temperatures. That may illustrate the advantage of stainless 300 even further. I suppose the third bar would require different units, as it really wouldn't be expressing the same thing, but having them all together would look cool and informative.

Anonymous

Very informative and enjoyable presentation. Be well.

Anonymous

Any links to the research you looked at? I’m interested in learning more about these things myself.

Anonymous

Thank you Tim for the great video. A question is left for me: wasn't it a special stainless steel with more oxygen atoms or so? I thought it wasn't the same material a for cooking. Best wishes from Germany

Anonymous

A good piece. The only quip I have is with your speculation at the end of the video, regarding the payload to LEO. Musk has hinted that Raptor will be getting a thrust improvement. How much, we don't know, but that might also compensate for the whole stack being heavier than originally planned.

Anonymous

Great vid, only wish you had more insider knowledge to know the details for sure :-) Still, really enjoyed it and hope you continue to be able to explain why and how these rocket companies use materials. Perhaps a comparison between SpaceX, Blue Origin and Electron (or more) to help us understand the differences, pros and cons, of each approach? Fab matey :-)

Anonymous

Great video Tim. I didn't get the answer only to a question: will reflecting of the shield degrade during reentry while the shield starts to become darker from burning through the atmosphere? I know it will not be a Engine-First reentry, but still Shuttle did not look shiny after reentry.

Anonymous

Don’t change anything. Great job!!

Anonymous

maybe add heatshield flamethrower test video?

Anonymous

Great video. Was the heatsheild issue ever solved with carbon fibre? I remember hearing about various materials (PICA-X?), but some seemed to be ablative. Is the "sweaty spaceship" solution only in fact possible/applicable with stainless steel? If so, that's another advantage over carbon fibre.

Anonymous

Well done! Love seeing the development of Starship... I wonder if the stainless steel will have the bluing affect from being tempered due to re-entry heat...

EverydayAstronaut
>>19371603

Unfortunately that number is all over the place, just too many variables and too many round numbers to illustrate accurately. The cryo and room temp we can do accurately but metal failures at high temp is really hard to nail down

EverydayAstronaut
>>19372193

That was mostly meant to set the tone that it’s perfectly fine if the payload capacity does go down, not necessarily thinking it will ( I even said I don’t think it will)

EverydayAstronaut
>>19372734

Hmmmm that I don’t know for sure but there won’t be any soot from the engines since methane burns clean but yeah it could get scorchy but I don’t know enough to say for sure

EverydayAstronaut
>>19375479

Oh crap... yeah that was a decent clip! Not sure if it’s worth the re render / reupload though. Dang it

EverydayAstronaut
>>19375726

Yes that’s only doable with stainless steel, I hope I made that point clear as it’s melting point is much much higher

Anonymous

Great video. Not worth changing the video, but the double layer skin (around 11:25) instead of a backbone might be compared to the exoskeleton of a beetle or ant. And we know how much *they* can carry for their size (yeah, because of cube/square law, not exoskeleton).

Anonymous

Awesome video as always. Adding the heat testing video that Elon posted would be cool as others have pointed out.

Anonymous
>>19372456

BO, Spacex and Electron are all in different classes so comparing them is like comparing a car to a motorbike. And each company has very different goals: Spacex has mars+ Earth to Earth Starship transportation, BO has space tourism in mind and Electron is trying to make the small launch market more affordable.

Anonymous

Thanks for doing your homework and making a complex subject understandable and entertaining.

Anonymous

Love the updated intro! Hey Tim why use methane for cooling rather than oxygen? As I understand it the speed at re-entry is so intense the gas is virtually a plasma buffer that creates a cooling effect between the shockwave and the surface. So why use methane? Oxygen could not only replenish the ozone but is smells way better!

Anonymous

The Tim, great video as always. One question I had was regarding which series of Stainless Steel SpaceX is using. I thought it was 304 and not 301. I think Elon tweeted 301 at first, but then corrected himself that 304 was the material of choice. I’ll try to search through past tweets and see if I can’t find definitely if it’s 301 or 304...

Brant Wedel
>>19385197

Yep, I wonder if it is similar to introducing oxygen to a torch, the flame gets hotter because oxygen allows other gases to react, they can't burn without oxygen at any temperature. Altho it's not exactly a "flame" on re-entry, not sure how all that relates to plasma. I do think in the case of plasma you want the gas with the highest thermal expansion, since it isn't reacting, and expanding will create a larger buffer, I think the hydrogen in the Methane would help that expansion. (Disclaimer: Not a chemist, just intrested)

Anonymous

Looks good Tim, I know I'm late, life happens. I'm paying more attention to SpaceX getting the Dragon off the ground this month. As far is this stainless steel to composite argument, the video tells the tale, trade-offs vs. the cost savings seem well worth it. Can't wait to see the Starship Hopper do its thing.