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| John Doe... |
 Posted: Sun Nov 01, 2009 3:31 am |
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I have noticed some pictures of the parachutes (simulations I guess).
This look more like hot air balloons than parachutes. Is this the first
time such designs are used instead of more conventional parachutes ?
Considering that 2 of 3 failed to properly deploy in this test flight,
will Nasa be reviewing the selection of this design ?
The picture I saw was at:
http://www.spaceflightnowplus.com/hd/ares1x/
(look for "Overview of the parachute system". I can't download the
actual movie though). |
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| Derek Lyons... |
| Posted: Sun Nov 01, 2009 1:27 pm |
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John Doe <jdoe at (no spam) doe.org> wrote:
[quote]I have noticed some pictures of the parachutes (simulations I guess).
This look more like hot air balloons than parachutes. Is this the first
time such designs are used instead of more conventional parachutes ?
[/quote]
That is how many conventional parachutes work, and how NASA's
parachutes have worked for decades. They first open partially (as
seen in the picture) and then after they are stable, they open
entirely. This is called 'reefing' and allow for controlled inflation
of the parachute and minimizes both opening shocks on the parachute
and deceleration shocks and loads on the suspended payload.
[quote]Considering that 2 of 3 failed to properly deploy in this test flight,
will Nasa be reviewing the selection of this design ?
[/quote]
I think we can take that as a given.
[quote]The picture I saw was at:
http://www.spaceflightnowplus.com/hd/ares1x/
(look for "Overview of the parachute system". I can't download the
actual movie though).
[/quote]
http://www.youtube.com/watch?v=PZfrxUgZSuM
Watch the parachute deployment sequence begining at roughly 1:40 and
you can see the partially open ('hot air balloon') stage as well as
the subsequent fully open stage.
D.
--
Touch-twice life. Eat. Drink. Laugh.
http://derekl1963.livejournal.com/
-Resolved: To be more temperate in my postings.
Oct 5th, 2004 JDL |
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| Jorge R. Frank... |
| Posted: Sun Nov 01, 2009 1:58 pm |
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Derek Lyons wrote:
[quote]John Doe <jdoe at (no spam) doe.org> wrote:
I have noticed some pictures of the parachutes (simulations I guess).
This look more like hot air balloons than parachutes. Is this the first
time such designs are used instead of more conventional parachutes ?
That is how many conventional parachutes work, and how NASA's
parachutes have worked for decades. They first open partially (as
seen in the picture) and then after they are stable, they open
entirely. This is called 'reefing' and allow for controlled inflation
of the parachute and minimizes both opening shocks on the parachute
and deceleration shocks and loads on the suspended payload.
Considering that 2 of 3 failed to properly deploy in this test flight,
will Nasa be reviewing the selection of this design ?
I think we can take that as a given.
[/quote]
Depends on what he's referring to. NASA will indeed review the details
of the design including the deployment sequence. But there is zero
chance that this review would result in anything other than a 'reefed'
design. The outcome of I-X would most certainly have been even worse had
the chutes not been reefed. |
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| John Doe... |
| Posted: Sun Nov 01, 2009 3:09 pm |
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Derek Lyons wrote:
[quote]http://www.youtube.com/watch?v=PZfrxUgZSuM
Watch the parachute deployment sequence begining at roughly 1:40 and
you can see the partially open ('hot air balloon') stage as well as
the subsequent fully open stage.
[/quote]
Many thanks. Is it correct to state that the empty Ares1X SRB had the
same weight as a 5 segment SRB for the real Ares-1 and that the
parachutes in use for Ares1X were the ones that would be used by the
real Ares1 ?
Do the Shuttle SRB parachutes work the same way but are just smaller ? |
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| Derek Lyons... |
| Posted: Sun Nov 01, 2009 4:13 pm |
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John Doe <jdoe at (no spam) doe.org> wrote:
[quote]Derek Lyons wrote:
http://www.youtube.com/watch?v=PZfrxUgZSuM
Watch the parachute deployment sequence begining at roughly 1:40 and
you can see the partially open ('hot air balloon') stage as well as
the subsequent fully open stage.
Many thanks. Is it correct to state that the empty Ares1X SRB had the
same weight as a 5 segment SRB for the real Ares-1 and that the
parachutes in use for Ares1X were the ones that would be used by the
real Ares1 ?
[/quote]
AIUI, the 1-X stage is actually heavier than the ultimate flight
stage. The parachutes used on 1-X were/are the intended for use by
the production version of the Ares 1
[quote]Do the Shuttle SRB parachutes work the same way but are just smaller ?
[/quote]
Yes. It's a standard technique for high speed parachutes.
D.
--
Touch-twice life. Eat. Drink. Laugh.
http://derekl1963.livejournal.com/
-Resolved: To be more temperate in my postings.
Oct 5th, 2004 JDL |
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| Brian Thorn... |
| Posted: Sun Nov 01, 2009 4:54 pm |
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On Sun, 01 Nov 2009 15:09:05 -0500, John Doe <jdoe at (no spam) doe.org> wrote:
[quote]Watch the parachute deployment sequence begining at roughly 1:40 and
you can see the partially open ('hot air balloon') stage as well as
the subsequent fully open stage.
Many thanks. Is it correct to state that the empty Ares1X SRB had the
same weight as a 5 segment SRB for the real Ares-1
[/quote]
Ares 1-X was heavier, due to the dummy fifth segment being loaded with
avionics and instrumentation that won't be on the Ares I (which will
be controlled by the Upper Stage/Orion.)
Brian |
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