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#21
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John Steinberg wrote:
Carsten A. Arnholm wrote: Yes. Launch the shuttle first and *then* apply the foam. FYI: http://facilities.grc.nasa.gov/spf/ I've just done some very quick scratch figuring and the real answer isn't better foam application but rather a better ablative material. Turns out my materials science manual has the answer on page 831. Duct tape. Alas, you neglect the OTHER reason there's foam on the external tank. Lots of stuff is ablative to resist heat loads on ascent. If that was all there was to it, there'd be a think spray on layer of fiberglass or something there. The pre-launch reason to have foam there is to prevent ice buildup on the outside of the tank. Because, if you think foam shedding is bad for Shuttle Tiles and RCC leading edge sections, you should see what ten pounds of nice solid liquid-hydrogen subchilled water ice will do to any surface of the shuttle... Foam on the outside does both jobs. Foam on the inside of the tanks would help prevent water ice buildup on the outside, but not help with ascent heating. External ablative shielding plus internal foam would do both better than we get right now, but would be heavier. And any solution involving internal insulation will require testing and safety validation. -george william herbert / |
#22
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"John Steinberg" wrote in message ... Dr. P. Quackenbush wrote: You forgot the probable need ... ^^^^^^^^ Before you respond, please show you've done the math. No, I will not do your homework, Dr. Um, your idea, YOUR homework. My job is not to prove your ideas will work or not. You bring it to the table, you prove it can work. Those are the rules of life. |
#23
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George William Herbert wrote:
The pre-launch reason to have foam there is to prevent ice buildup on the outside of the tank. Because, if you think foam shedding is bad for Shuttle Tiles and RCC leading edge sections, you should see what ten pounds of nice solid liquid-hydrogen subchilled water ice will do to any surface of the shuttle... Foam on the outside does both jobs. Foam on the inside of the tanks would help prevent water ice buildup on the outside, but not help with ascent heating. External ablative shielding plus internal foam would do both better than we get right now, but would be heavier. Even better would be to put the actual space vehicle in a position where falling objects will not hit it. That means on the top and not on the side, under or whatever. -- Carsten A. Arnholm http://arnholm.org/ N59.776 E10.457 |
#24
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"John Steinberg" wrote in message ... Sometimes even rocket science isn't rocket science. Oh! I love this one. Might I be able to quote this from you in my sig line? Thanks! Jim |
#25
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#26
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"Carsten A. Arnholm" wrote:
Even better would be to put the actual space vehicle in a position where falling objects will not hit it. That means on the top and not on the side, under or whatever. Which doesn't protect the booster from the spacecraft. CIP Skylab I. D. -- Touch-twice life. Eat. Drink. Laugh. -Resolved: To be more temperate in my postings. Oct 5th, 2004 JDL |
#27
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How close can you get to the SRB without frying at liftoff? Hypothetically
how close could you get to the SRB in space. How much wood can a woodchuck chuck if a woodchuck could chuck wood? huh? took my meds today too prevents heat transfer. It's not ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#28
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On Mon, 1 Aug 2005 14:26:36 -0500, Derek Lyons wrote
(in article ): (George William Herbert) wrote: Foam on the outside does both jobs. Foam on the inside of the tanks would help prevent water ice buildup on the outside, but not help with ascent heating. Huh? Insulation is insulation - it prevents heat transfer. It's not a one way mirror. D. I think GWH means ascent heating effects on the structural materials. Internal insulation would protect against boil-off of cryogens, but would do nothing to assist with the effects of heat weakening the airframe of the tank. -- "Fame may be fleeting but obscurity is forever." ~Anonymous "I believe as little as possible and know as much as I can." ~Todd Stuart Phillips www.angryherb.net |
#29
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In article ,
alex pozgaj wrote: Roy Smith writes: 1) It's too tight. 2) It's too loose. It therefore follows that a roll of duct tape and a can of WD-40 should be able to fix most problems. Is that original? I'd love to use it in my sig! Well, this is already in my cookie file. You need only two tools: WD-40 and duct tape. If it moves and it shouldn't, use the duct tape. If it doesn't move and it should, use the WD-40. -- Kathy Rages |
#30
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Kathy Rages wrote:
You need only two tools: WD-40 and duct tape. If it moves and it shouldn't, use the duct tape. If it doesn't move and it should, use the WD-40. Of course, for women substitute Pam for WD-40. Jim Davis |
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