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On Topic: Choice of paint used inside S-I stage
....In an effort to get topics back on track around here - I've nothing
better to do for reasons we're all aware of - here's the first in a series of topics that might get things going back to normal around he Q: After having watched that famous clip of the S-IVB leaving the Saturn IB's first stage - the one that looks just like the Original Galactica's main guns firing! - something came to mind that I never wondered about before. Why was the entire inside of the adapter above the fuel tanks painted yellow? What was the decision rationale behind that choice of color? Was there a specific reason yellow was used, and did it apply to why the same color was used on the top of the S-II tank dome? OM -- ]=====================================[ ] OMBlog - http://www.io.com/~o_m/omworld [ ] Let's face it: Sometimes you *need* [ ] an obnoxious opinion in your day! [ ]=====================================[ |
#2
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On Topic: Choice of paint used inside S-I stage
On Mon, 28 Apr 2008 15:42:45 -0500, in a place far, far away, OM
made the phosphor on my monitor glow in such a way as to indicate that: ...In an effort to get topics back on track around here - I've nothing better to do for reasons we're all aware of - here's the first in a series of topics that might get things going back to normal around he Q: After having watched that famous clip of the S-IVB leaving the Saturn IB's first stage - the one that looks just like the Original Galactica's main guns firing! - something came to mind that I never wondered about before. Why was the entire inside of the adapter above the fuel tanks painted yellow? What was the decision rationale behind that choice of color? Was there a specific reason yellow was used, and did it apply to why the same color was used on the top of the S-II tank dome? To make inquisitive little boys with (big) booboos on their leg ask questions. Obviously, it worked. Well, anyway, that's *my* best guess. Others, more knowledgeable, may have better ones. |
#3
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On Topic: Choice of paint used inside S-I stage
OM wrote in
: Q: After having watched that famous clip of the S-IVB leaving the Saturn IB's first stage - the one that looks just like the Original Galactica's main guns firing! - something came to mind that I never wondered about before. Why was the entire inside of the adapter above the fuel tanks painted yellow? What was the decision rationale behind that choice of color? Was there a specific reason yellow was used, and did it apply to why the same color was used on the top of the S-II tank dome? Yellow chromate primer to prevent corrosion of the aluminum? --Damon |
#4
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On Topic: Choice of paint used inside S-I stage
On Apr 28, 1:42 pm, OM wrote:
...In an effort to get topics back on track around here - I've nothing better to do for reasons we're all aware of - here's the first in a series of topics that might get things going back to normal around he Q: After having watched that famous clip of the S-IVB leaving the Saturn IB's first stage - the one that looks just like the Original Galactica's main guns firing! - something came to mind that I never wondered about before. Why was the entire inside of the adapter above the fuel tanks painted yellow? What was the decision rationale behind that choice of color? Was there a specific reason yellow was used, and did it apply to why the same color was used on the top of the S-II tank dome? OM -- ]=====================================[ ] OMBlog -http://www.io.com/~o_m/omworld [ ] Let's face it: Sometimes you *need* [ ] an obnoxious opinion in your day! [ ]=====================================[ I bet it was zinc chromate paint, used in the aerospace industry to coat aluminum to prevent corrosion. |
#5
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On Topic: Choice of paint used inside S-I stage
OM wrote: ...In an effort to get topics back on track around here - I've nothing better to do for reasons we're all aware of - here's the first in a series of topics that might get things going back to normal around he Q: After having watched that famous clip of the S-IVB leaving the Saturn IB's first stage - the one that looks just like the Original Galactica's main guns firing! - something came to mind that I never wondered about before. Why was the entire inside of the adapter above the fuel tanks painted yellow? What was the decision rationale behind that choice of color? Was there a specific reason yellow was used, and did it apply to why the same color was used on the top of the S-II tank dome? Was it zinc chromate paint for corrosion resistance? We had a can of zinc chromate paint around our house when I was a kid, and although the WW II stuff was light yellow-green, our can had yellow paint in it. Pat |
#6
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On Topic: Choice of paint used inside S-I stage
Damon Hill wrote: Yellow chromate primer to prevent corrosion of the aluminum? Corrosion must have been a major concern for NASA with the Saturns in the humid and salty Cape environment. Remember how the zinc primer on the Shuttle launch facility leeched off as zinc oxide during rain and weakened the RCC panels on the wings, by causing some of the structure to convert to CO2 during reentry. Then there was SpaceX's failed Falcon launch due to a corroded nut: http://www.space.com/missionlaunches...n1_update.html Pat |
#7
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On Topic: Choice of paint used inside S-I stage
On Mon, 28 Apr 2008 19:05:29 -0500, in a place far, far away, Damon
Hill made the phosphor on my monitor glow in such a way as to indicate that: OM wrote in : Q: After having watched that famous clip of the S-IVB leaving the Saturn IB's first stage - the one that looks just like the Original Galactica's main guns firing! - something came to mind that I never wondered about before. Why was the entire inside of the adapter above the fuel tanks painted yellow? What was the decision rationale behind that choice of color? Was there a specific reason yellow was used, and did it apply to why the same color was used on the top of the S-II tank dome? Yellow chromate primer to prevent corrosion of the aluminum? What a boring answer. |
#8
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On Topic: Choice of paint used inside S-I stage
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#9
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On Topic: Choice of paint used inside S-I stage
On Mon, 28 Apr 2008 22:20:52 -0500, Damon Hill
wrote: Yellow chromate primer to prevent corrosion of the aluminum? ....This makes sense, as the primer used on a lot of nautical items is the same type. It does beg the next question as to whether or not the red/white painting most gantry structures in the early days used was also of a similar composition to provide the same service. What a boring answer. Yeah, that's practical engineering for you... ....Nah, it's just Rand and his usual short, sniping commentary. I find now, after all the morphine and dilauded intake, some of the neurons in my brain that usually fired off RED ALERT signals appear to have been numbed enough to where I can sort of tolerate it enough to almost ignore it. Even if he still can't trim his quotes worth a frack. OM -- ]=====================================[ ] OMBlog - http://www.io.com/~o_m/omworld [ ] Let's face it: Sometimes you *need* [ ] an obnoxious opinion in your day! [ ]=====================================[ |
#10
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On Topic: Choice of paint used inside S-I stage
OM wrote in
: On Mon, 28 Apr 2008 22:20:52 -0500, Damon Hill wrote: Yellow chromate primer to prevent corrosion of the aluminum? ...This makes sense, as the primer used on a lot of nautical items is the same type. It does beg the next question as to whether or not the red/white painting most gantry structures in the early days used was also of a similar composition to provide the same service. Might have started out as red and white lead paint, the idea being to stand out to aircraft. Well, from what I've seen of the salt haze down there, some daze it's so thick that everything more than a few miles away turns the same greyscale and blends together. Besides, I'm pretty sure lead paint got banned decades ago; seems like even nitrocelluose aircraft paint won't stand up to that and heavy UV for more than a decade. So, I dunno what they'd be using now but it seems like you neglect that stuff for too many years and it all starts to corrode dangerously, hot-dipped zinc galvanizing or not... Maybe they're using some sort of thick coat polyurethane or suchlike? There are conversion coatings that are supposed to bond to corrosion and neutralize it. Don't get me started on the buzzard droppings. Nasty stuff. We need a local who actually works onsite; too bad Kim Keller's moved on. I saw the 'milkstool' up close back in the 70's, but all I remember it was a thickish grey paint. --Damon |
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