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#80 by nathan.moeller on 11 Jun, 2007 17:16
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Joey - 11/6/2007 12:10 PM
I understand the addition of this truss assembly will really help "balance" out the station?
Well, visually, yes. It'll be almost symmetrical again. But if you mean balanced by weight, not really. Technically, it's yes, as each side of the station will 'weigh' almost the same amount, but it's no issue in the zero-g environment. -
#81 by AntiKev on 11 Jun, 2007 17:21
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But it matters for C of G location.
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#82 by Johnny Rönnberg on 11 Jun, 2007 17:22
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Will the attitude control problem delay the EVA or it's some extra preptime in the time line?
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#83 by Zachstar on 11 Jun, 2007 17:25
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I guess we are just waiting here for the station to right itself.
Meanwhile here is a image with a nice view of the earth and S3/S4 Truss.
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#84 by DaveS on 11 Jun, 2007 17:26
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Zachstar - 11/6/2007 7:25 PM
And the orbiter KU band dish in the lower left corner.
I guess we are just waiting here for the station to right itself.
Meanwhile here is a image with a nice view of the earth and S3/S4 Truss. -
#85 by Joey on 11 Jun, 2007 17:26
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nathan.moeller - 11/6/2007 1:16 PM
QuoteJoey - 11/6/2007 12:10 PM I understand the addition of this truss assembly will really help "balance" out the station?
Well, visually, yes. It'll be almost symmetrical again. But if you mean balanced by weight, not really. Technically, it's yes, as each side of the station will 'weigh' almost the same amount, but it's no issue in the zero-g environment.I guess I was trying to say, from the location of the CMGs vs the configuration of the station after the S3/S4 truss is installed, the CMGs would not have to "work" as hard maintaining attitude control. In other words the torque moments would be altered, making it easier on the CMGs.
Indeed, yes, the visual appearance would also be balanced too.
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#86 by Gary on 11 Jun, 2007 17:28
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nathan.moeller - 11/6/2007 6:16 PM
QuoteJoey - 11/6/2007 12:10 PM
I understand the addition of this truss assembly will really help "balance" out the station?
Well, visually, yes. It'll be almost symmetrical again. But if you mean balanced by weight, not really. Technically, it's yes, as each side of the station will 'weigh' almost the same amount, but it's no issue in the zero-g environment.
What about the gravity gradient? With two solar arrays nicely balancing the station is must help with the gradient - If not why did they leave one solar array extended on the last mission on the opposite side to the array they installed? -
#87 by nacnud on 11 Jun, 2007 17:32
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So the new array could follow the sun, it would have hit the other one.
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#88 by bsegal on 11 Jun, 2007 17:34
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Hope the reporters have the sense to ask about the cause of the CMG problems today, and the extent to which they were unanticipated. Even heard a recent call up for Yurchikin to stop exercising after the CMGs were commanded back to attitude control. Guess this will just puch the EVA timeline back until they can get the truss berthed.
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#89 by DaveS on 11 Jun, 2007 17:35
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nacnud - 11/6/2007 7:32 PM
Exactly. The 4B SAW on P6, was in the way for the SAWs on P4, just like the 2B SAW on P6 is in the way for the S4 SAWs.
So the new array could follow the sun, it would have hit the other one. -
#90 by Zachstar on 11 Jun, 2007 17:42
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Awaiting the go to continue.
CPU Generated Image of current position.
Image2: Quick Image from Camera showing the truss again.
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#91 by Zachstar on 11 Jun, 2007 17:45
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Ok getting ready to go again!
Edit: Oh no! They are going stright into the ZOE and the sun will soon set.
Really getting behind it seems. -
#92 by nathan.moeller on 11 Jun, 2007 17:46
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Am I seeing movement?
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#93 by nathan.moeller on 11 Jun, 2007 17:47
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S3/S4 moving in.
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#94 by Zachstar on 11 Jun, 2007 17:48
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Images of the move.
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#95 by Norm Hartnett on 11 Jun, 2007 17:48
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According to the web to desaturate the CMGs they will have to balance momentum loss from the CGMs with the RCS system. They can't do that with the arm holding the truss element. I don't think they can do it during EVA either so they will have to desaturate during the pause between latching and the EVA or after the EVA.
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#96 by Zachstar on 11 Jun, 2007 17:50
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Edit: Looks like the CanadaArm2 has stopped.
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#97 by nacnud on 11 Jun, 2007 17:54
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Perhaps waiting for good lighting on the white reference disks? (I forget what they are called)
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#98 by Zachstar on 11 Jun, 2007 17:54
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Ok Arm in motion again!
Edit: Stopped
Edit2: Sunset! 30 Cm from truss. Final Align.
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#99 by nathan.moeller on 11 Jun, 2007 17:57
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30 cm to go.
