Re: Deorbiting progress's?
From: Jeff Findley (jeff.findley_at_ugs.nojunk.com)
Date: 12/20/04
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Date: Mon, 20 Dec 2004 11:33:02 -0500
"MasterShrink" <mastershrink@aol.com> wrote in message
news:20041218150035.09837.00001195@mb-m20.aol.com...
> Brian Gaff wrote:
> >Tell me folks, does anything from a Progress make it back to earth after
> >they command it to burn up? Im intrigued as both Skylab and the Shuttle
> >which broke up had significant amounts of hardware that came through.
>
> Some Progress capsules I think are returned to earth safely, after crews
load
> them up with scientific equipment they may want back on the ground to
maybe
> refurbish of analyze.
Absolutely not. Progress itself doesn't have a re-entry capsule. In its
place is an unpressurized section containing tanks (O2, N2, and etc.).
There have been tests of a very small re-entry capsule on Progress flights.
The capsule is ejected from the Progress orbital module after the re-entry
burn. This re-entry capsule bears no resemblance to the Soyuz re-entry
capsule.
> As for survivng hardware...Progress capsules are a lot smaller than
Columbia or
> Skylab were.
Size isn't as important as you'd think. The debris that makes it to the
ground (or ocean) is generally either large and light pieces that decelerate
high up in the atmosphere, decreasing heating (e.g. empty tanks), or are
"heavy" enough that it simply doesn't burn up completely.
Jeff
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