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#1
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Spacewalks Variations
It is not clear to me why not performing EVA-5 ahead of a EVA-4 now
dedicated to repair the solar array blanket. The both spacewalks are preplanned with different spacewalkers and different independent tasks. EVA-5 is well planned and important for the upcoming timline, and the multiple changed EVA-4 could gain an addtional day of planning. Albert |
#2
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Spacewalks Variations
I think the current thinking is that the array can be fixed, but the longer
its left, the more danger of the damage getting worse. The rotary joint look and see is not going to get worse if the joint is not moved, and thus can be delayed. I'm sure much of the rest can be fitted in as and when. I myself wonder if the obss could be employed toget access to the array without running the snagging risk implicit in retracting to get at the damaged section. I find it hard visualising the array folding and deployed mechanics, but seems to me, its got to be under some tension to be rigid enough o not wobble about as its moved in normal use, so whatever they need to use may need to be quite strong. Brian -- Brian Gaff - Note:- In order to reduce spam, any email without 'Brian Gaff' in the display name may be lost. Blind user, so no pictures please! "Albert Blauensteiner" wrote in message ... It is not clear to me why not performing EVA-5 ahead of a EVA-4 now dedicated to repair the solar array blanket. The both spacewalks are preplanned with different spacewalkers and different independent tasks. EVA-5 is well planned and important for the upcoming timline, and the multiple changed EVA-4 could gain an addtional day of planning. Albert |
#3
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Spacewalks Variations
Brian Gaff wrote:
wobble about as its moved in normal use, so whatever they need to use may need to be quite strong. And most likely non-conductive, and not mind UV in the sunlight. And be something a spacesuited astronaut can successfully work with. Maybe glue s sheet of something over the tear once it's tied down with some tie-raps? What sort of glue would work in vacuum? Epoxy? And have on hand up there, or it would have to wait for a supply mission? I'm sure people on the ground are on it, trying various solutions... |
#4
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Spacewalks Variations
On Oct 31, 12:39 pm, robert casey wrote:
What sort of glue would work in vacuum? Epoxy? And have on hand up there, Tile cement -- that being one of the Mission Objectives that may be omitted this time around due to the joint and tear problems. /dps |
#5
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Spacewalks Variations
On Oct 31, 10:18 am, "Brian Gaff" wrote:
[...] I myself wonder if the obss could be employed toget access to the array without running the snagging risk implicit in retracting to get at the damaged section. Sounds like the new pole in the cargo bay: -- this from AP via Yahoo http://news.yahoo.com/s/ap/20071031/ ap_on_sc/space_shuttle; quote The torn section of the wing cannot be reached with the space station's 58-foot robot arm. So NASA plans to attach the shuttle inspection boom to the station's robot arm, and put Scott Parazynski on the boom to free the snagged part of the wing. It helps that Parazynski is tall - 6-foot-2 - and has long arms. NASA doesn't want him bumping the wing or touching its sunlight-collecting blankets. There would be no need to mend the tears /quote /dps |
#6
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Spacewalks Variations
On Oct 31, 10:18 am, "Brian Gaff" wrote:
[...] I find it hard visualising the array folding and deployed mechanics, but seems to me, its got to be under some tension to be rigid enough o not wobble about as its moved in normal use, so whatever they need to use may need to be quite strong. Here's an attempt at a verbal pictu imagine a stack of punch cards (playing cards have too wide an aspect ratio -- the "cards" are long and skinny). Add hinges to opposite long sides so you have a Z-fold (or fan-fold if you prefer). The "first" long side gets attached to a curtain rod, and the "last" long side gets anchored in the box. I can't tell from http://www.nasa.gov/images/content/ 195515main_iss016e007399_hires.jpg if the narrow sides are attached to the scissors jack or not -- perhaps Jorge or Jim can fill in that detail. The scissors jack is parallel to the narrow sides, and pushes the curtain rod out, and the panels ("punch cards") follow along, pulled by the hinges. This is highly over-simpllified, of course, and may contain errors, so I'll keep an eye out for those people updating the verbal picture. /dps |
#8
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Spacewalks Variations
On Nov 1, 3:17 am, "Brian Gaff" wrote:
[...] However, the structural loading is what worries me. If you elect to cut a snagged wire you may make things worse unless you really know the stress distribution of a fully deployed array in zero g. Well, at the time I clipped that quote, the plan was to only inspect on this spacewalk and to decide on repairs only after analyzing the results. /dps |
#9
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Spacewalks Variations
On Thu, 01 Nov 2007 01:33:20 -0000, snidely
wrote: This is highly over-simpllified, of course, and may contain errors, so I'll keep an eye out for those people updating the verbal picture. ....No, you just might have explained what went wrong up the chads :-) 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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Spacewalks Variations
On Nov 2, 12:57 am, OM wrote:
...No, you just might have explained what went wrong up the chads :-) vbg /dps |
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