Author Topic: LIVE: STS-120 Flight Day 10 - MT/OBSS Ops - EVA-4 Preps (Read 63295 times)

ckiki lwai · « **Reply #100 on:** 11/01/2007 05:23 pm »

Seems like my drawing earlier this day was correct

ckiki lwai · « **Reply #101 on:** 11/01/2007 05:29 pm »

So the length of the wires will have to be very precise:
- to long and they don't take the loads
- to short and it will increase overall loads on the solar array

mwfair · « **Reply #102 on:** 11/01/2007 05:30 pm »

Very interesting repair principle. Essentially, they are not fixing the tear itself, they are using the 'cuff link' wire to connect good panels on either side of the bad hinge. So will the array then be extended to complete length and then tensioned? How much tension is nominally on the arrays?

Chris Bergin · « **Reply #103 on:** 11/01/2007 05:30 pm »

Media going after the shock hazards (rightly so too as it's a risky deal).

"We don't expect a current to jump in open space."

punkboi · « **Reply #104 on:** 11/01/2007 05:32 pm »

Quote

mwfair - 1/11/2007 11:30 AM How much tension is nominally on the arrays?

I read earlier that around 75 pounds of force is exerted on the arrays to make them rigid

Chris Bergin · « **Reply #105 on:** 11/01/2007 05:33 pm »

"As of this afternoon, we have completed all the outfitting required prior to relocation of Node 2".

ShuttleDiscovery · « **Reply #106 on:** 11/01/2007 05:36 pm »

Quote

Chris Bergin - 1/11/2007 7:33 PM

"As of this afternoon, we have completed all the outfitting required prior to relocation of Node 2".

That's something..

Chris Bergin · « **Reply #107 on:** 11/01/2007 05:36 pm »

ISS has all the power they need right now. Long term they need one or other other (repair and fixed arrays).

Andy_Small · « **Reply #108 on:** 11/01/2007 05:36 pm »

David Wolf is a great spokesmen for the Astronaut Corps!

Chris Bergin · « **Reply #109 on:** 11/01/2007 05:36 pm »

Quote

ShuttleDiscovery - 1/11/2007 7:36 PM

Quote
Chris Bergin - 1/11/2007 7:33 PM

"As of this afternoon, we have completed all the outfitting required prior to relocation of Node 2".

That's something..

Bought them back a day or two from the timeline also.

Chris Bergin · « **Reply #110 on:** 11/01/2007 05:40 pm »

"There comes times where higher risks need to be taken (for this repair)"

rocketguy101 · « **Reply #111 on:** 11/01/2007 05:40 pm »

Quote

ckiki lwai - 1/11/2007 1:29 PM So the length of the wires will have to be very precise: - to long and they don't take the loads - to short and it will increase overall loads on the solar array

Wonder if Scott was a Boy Scout? (his NASA bio didn't say, or I missed it) If he had his Pioneering merit badge, he could adjust the lenghts They could attach two "shorties" to make a longer wire if necessary, perhaps tie a knot to shorten one??

Chris Bergin · « **Reply #112 on:** 11/01/2007 05:42 pm »

Right now, no EVA-5, undock FD14. If the repair is not successful, look at consumables, maybe do a short EVA-5.

ShuttleDiscovery · « **Reply #113 on:** 11/01/2007 05:43 pm »

Quote

Chris Bergin - 1/11/2007 7:42 PM

Right now, no EVA-5, undock FD14. If the repair is not successful, look at consumables, maybe do a short EVA-5.

I guess there can be less time between EVA-4 and 5 as it's by Peggy and Yuri, correct?

ckiki lwai · « **Reply #114 on:** 11/01/2007 05:44 pm »

risks involved: normally an astronaut has to be able to return to the airlock in 30 min, this will not be possible during this EVA

mwfair · « **Reply #115 on:** 11/01/2007 05:45 pm »

As stated in the MSB, the array can't be safed, the cells produce voltage when light shines! However, they have 45minutes of no light, so can Scott touch the array during orbital night?

ckiki lwai · « **Reply #116 on:** 11/01/2007 05:46 pm »

difficulty rated a 7,5 to 10 because it is very mentally demanding

ngilmore · « **Reply #117 on:** 11/01/2007 05:53 pm »

Robotic ops: SSRMS to move from work station 8 to work station 3. Will pick up OBSS. Will hand off to SRMS so it has power. Will translate back to work station 8. Will pick up OBSS from SRMS.

My question: Since the SRMS can normally take out the OBSS, and since according to this plan it can hand off to the SSRMS at work station 8, why does the SSRMS mobile transport have to move back and forth in the first place. What constraint prevents the SRMS from taking the OBSS out on its own?

ckiki lwai · « **Reply #118 on:** 11/01/2007 05:54 pm »

Quote

mwfair - 1/11/2007 7:45 PM

As stated in the MSB, the array can't be safed, the cells produce voltage when light shines! However, they have 45minutes of no light, so can Scott touch the array during orbital night?

Your question got answered

He says the protection is adequate so he sees no reason not to continue the activities in daylight

edit:spelling

Wisi · « **Reply #119 on:** 11/01/2007 05:59 pm »

Quote

Chris Bergin - 1/11/2007 8:42 PM

Right now, no EVA-5, undock FD14.

Does that mean, landing day is FD16?