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Old 06-27-2008, 03:31 PM   #91
ar81
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Empty ET is as heavy as a fully loaded truck.
I just can imagine what it would be to be a fish and then see a fully loaded ET falling to the sea during RTLS...

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Old 06-27-2008, 04:08 PM   #92
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Originally Posted by ar81 View Post
 Empty ET is as heavy as a fully loaded truck.
I just can imagine what it would be to be a fish and then see a fully loaded ET falling to the sea during RTLS...
I would not be too sure, that the ET stays intact. At the end of the powered phase of a RTLS abort, the Shuttle gained again some velocity, is in a steep dive (800 feet per second descend rate or -245 m/s) and in the upper atmosphere.

Also, the Shuttle reaches 2.2G vertical acceleration (Nz) during the alpha recovery phase after ET separation, which is quite violent (2.5G is design limit of the Shuttle) and a sign of extreme dynamic pressure - the ET would get even worse dynamic pressure as it does not pull out of the dive.

The ET is not protected against high aerodynamic heating, which is proportional to dynamic pressure. Also, it can only survive high aerodynamic loads when flying controlled, but it will be tumbling after separation

I would be pretty surprised if the ET stays intact, I would expect fragmentation under these conditions.
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Old 07-01-2008, 03:42 AM   #93
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Originally Posted by astrosammy View Post
 Is it right that an RTLS (Return To Launch Site) only can be made after the SRB burnout?

http://en.wikipedia.org/wiki/Space_S...ct_abort_modes
There are two reasons for this:

1. During an RTLS, you need to drain the ET to <=2% capacity. This is because the amount of liquid in the ET could cause the ET to swing back around and damage the Orbiter after ET sep.

2. Even though it's "possible" to abort prior to SRB sep, it's not done because any RTLS is executed at 2m30s minimum. This is partly for the reason 1 listed above, and partly so that the shuttle can gain enough altitude/velocity to safely glide back to the landing site.

Regards,

_O.K._
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Old 07-01-2008, 04:16 AM   #94
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Whats with the loud screeching sound during docking and undocking?
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Old 07-01-2008, 04:37 AM   #95
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Ghosts in the OMS engines.
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Old 07-08-2008, 06:49 AM   #96
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Thanks for replying Urwurmple, sorry I didn't thank you sooner, but to be honest, I had forgotten all about the thread.
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Old 07-08-2008, 12:30 PM   #97
ar81
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Waste: What do they produce? How do they handle it?
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Old 07-08-2008, 02:15 PM   #98
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 Waste: What do they produce? How do they handle it?
All sorts of it you can imagine (packaging, wet trash, wet cloths) plus also the dirty laundry, which also not returned to Earth.

The waste is put into a Progress or ATV and burned in the atmosphere when the cargo ferry undergoes destructive reentry.
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Old 07-09-2008, 07:05 AM   #99
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Wait... destructive reentry? What's that?
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Old 07-09-2008, 07:17 AM   #100
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 Wait... destructive reentry? What's that?
A reentry, after which the spacecraft is destroyed - what else?
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Old 07-09-2008, 07:50 AM   #101
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Has Dextre been used as of yet? I find it incredibly interesting that it was assembled in orbit, contrary to the typical unpacking. (I just have to say that watching trained professionals remove "pillow covers" makes me a little sad inside. )

Also, if the Shuttle was extended (which isn't happening) or if Direct comes along. What modules would be able to attach to station. What payloads are currently sitting ducks in the Space Station Processing Facility back in Florida...Forget that one, just answered it myself. Cupola and the remaining Kibo exterior platform+arm.

Instead what will happen to the Space Station infrastructure, like the SSPF, after 2010?
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Old 07-09-2008, 07:52 AM   #102
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 A reentry, after which the spacecraft is destroyed - what else?
Seems like a waste of a spacecraft... Why can't they give it to me, instead?
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Old 07-17-2008, 05:48 PM   #103
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How will the ISS be able to evacuate a crew of 7? Where will they sleep? And will NASA install a second toilet?
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Old 07-17-2008, 06:00 PM   #104
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 How will the ISS be able to evacuate a crew of 7? Where will they sleep? And will NASA install a second toilet?
The ISS has consumable reserves which allow that for a reasonable time. they will sleep, where they can find place - it will become pretty crowded anyway. no second toilet - nobody did ever say it will be comfortable.
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Old 07-17-2008, 06:19 PM   #105
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So what happened to the planned habitation module? Was it cancelled?
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