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#11
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GO for EVA-4 on monday; landing delayed to Friday
Herb Schaltegger wrote:
Because the arrays are not structurally strong enough to be moved to the truss without being fully retracted. "Not designed" doesn't necessarily mean that it cannot do it. Since the arrays are able to widthstand reboost operations, as well as the G force resulting from a docking vehicle, couldn't the arm move P6 with g forces that are less than reboots/dockings ? |
#12
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GO for EVA-4 on monday; landing delayed to Friday
Wire clippers not WD40.
Pure speculation, couldn't find a drawing. Sure sounds like the grommets are getting stuck on broken strands of wire of a wire rope, if that's what grommets are sliding on. Some sailboats have wire rope halyards. Wire rope is different from wire cable in that the individual strands of wire within the rope are very thin. This makes the wire rope very flexible, unlike wire cable. When these become old, individual wires in the rope will break. The wire rope is still fine, but if you rub your hand along the rope, you'll make a bloody mess. The broken wire strands are sharp, stick out a bit and will snag anything. Also, sounds like the wire rope is being wound up on the opposite end from where the solar panels are being folded. The grommets would have to slide many meters instead of a few centimeters. Also, if they did you wire rope, they may have just as much trouble unfolding it because of the other end of the broken strands. -- Craig Fink Courtesy E-Mail Welcome @ -- On Sun, 17 Dec 2006 07:57:11+0000, Brian Gaff wrote: Well, it looks like someone needs to do some work on designing solar array mechanisms..: I mean if you have to stand over them after 6 years and wiggle them every so often to get them to not stick then...:-) I hope someone has a plan of exactly what can be done in future, as there is another array they will need to stow before moving the truss, I think. Send out a can of WD40? :-) Brian |
#13
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GO for EVA-4 on monday; landing delayed to Friday
Wire clippers not WD40. Preferably fingernail clippers.
Pure speculation, couldn't find a drawing. Sure sounds like the grommets are getting stuck on broken strands of wire of a wire rope, if that's what grommets are sliding on. Some sailboats have wire rope halyards. Wire rope is different from wire cable in that the individual strands of wire within the rope are very thin. This makes the wire rope very flexible, unlike wire cable. When these become old, individual wires in the rope will break. The wire rope is still fine, but if you rub your hand along the rope, you'll make a bloody mess. The broken wire strands are sharp, stick out a bit and will snag anything. Also, sounds like the wire rope is being wound up on the opposite end from where the solar panels are being folded. The grommets would have to slide many meters instead of a few centimeters. Also, if they did you wire rope, they may have just as much trouble unfolding it because of the other end of the broken strands. -- Craig Fink Courtesy E-Mail Welcome @ -- On Sun, 17 Dec 2006 07:57:11+0000, Brian Gaff wrote: Well, it looks like someone needs to do some work on designing solar array mechanisms..: I mean if you have to stand over them after 6 years and wiggle them every so often to get them to not stick then...:-) I hope someone has a plan of exactly what can be done in future, as there is another array they will need to stow before moving the truss, I think. Send out a can of WD40? :-) Brian -- Craig Fink Courtesy E-Mail Welcome @ |
#14
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GO for EVA-4 on monday; landing delayed to Friday
On Sun, 17 Dec 2006 23:38:15 -0500, John Doe wrote:
Since the arrays are able to widthstand reboost operations, as well as the G force resulting from a docking vehicle, couldn't the arm move P6 with g forces that are less than reboots/dockings ? Yeah, I agree with you, but they would be awkward to move that way and clearances might be a problem. |
#15
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GO for EVA-4 on monday; landing delayed to Friday
Pours third cup of coffee, morning fog begins to lift
Wire clippers not WD40. Preferably fingernail clippers. Pure speculation, couldn't find a drawing. Sure sounds like the grommets are getting stuck on broken strands of wire of a wire rope, if that's what the grommets are sliding on. Some sailboats have wire rope halyards. Wire rope is different from wire cable in that the individual strands of wire within the rope are very thin. This makes the wire rope very flexible, unlike wire cable. When these become old, individual wires in the rope will break. The wire rope is still fine, but if you rub your hand along the rope, you'll make a bloody mess. The broken wire strands are sharp, stick out a bit and will snag anything. Also, sounds like the wire rope is being wound up on the opposite end from where the solar panels are being folded. The grommets would have to slide many meters instead of a few centimeters. Also, if they did use wire rope, they may have just as much trouble unfolding it because of the other end of the broken strands. -- Craig Fink Courtesy E-Mail Welcome @ -- On Sun, 17 Dec 2006 07:57:11+0000, Brian Gaff wrote: Well, it looks like someone needs to do some work on designing solar array mechanisms..: I mean if you have to stand over them after 6 years and wiggle them every so often to get them to not stick then...:-) I hope someone has a plan of exactly what can be done in future, as there is another array they will need to stow before moving the truss, I think. Send out a can of WD40? :-) Brian -- Craig Fink Courtesy E-Mail Welcome @ |
#17
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GO for EVA-4 on monday; landing delayed to Friday
Kind of makes me wonder why they didn't coat the wire rope with teflon to
keep the broken strands in place. Especially, after the MIR incident. Also, sounds like the US space suits have no grounding wire on them, they sure seemed to be afraid to touch the wire rope for some strange reason. Birds that fly, do it all the time. -- Craig Fink Courtesy E-Mail Welcome @ -- On Tue, 19 Dec 2006 15:25:48 +0000, Craig Fink wrote: Seems it was wire rope, 3 cords of 7 strands of wire (total 21). Two strands of wire were broken, I would think by an impact. I wonder how much trouble they'll have extending them again, and if plans will change to have astronauts assist opening and closing of arrays. Wire clippers not WD40. Preferably fingernail clippers. Pure speculation, couldn't find a drawing. Sure sounds like the grommets are getting stuck on broken strands of wire of a wire rope, if that's what the grommets are sliding on. Some sailboats have wire rope halyards. Wire rope is different from wire cable in that the individual strands of wire within the rope are very thin. This makes the wire rope very flexible, unlike wire cable. When these become old, individual wires in the rope will break. The wire rope is still fine, but if you rub your hand along the rope, you'll make a bloody mess. The broken wire strands are sharp, stick out a bit and will snag anything. Also, sounds like the wire rope is being wound up on the opposite end from where the solar panels are being folded. The grommets would have to slide many meters instead of a few centimeters. Also, if they did use wire rope, they may have just as much trouble unfolding it because of the other end of the broken strands. On Sun, 17 Dec 2006 07:57:11+0000, Brian Gaff wrote: Well, it looks like someone needs to do some work on designing solar array mechanisms..: I mean if you have to stand over them after 6 years and wiggle them every so often to get them to not stick then...:-) I hope someone has a plan of exactly what can be done in future, as there is another array they will need to stow before moving the truss, I think. Send out a can of WD40? :-) |
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