MSL EDL Hardware, Its state & fate |
MSL EDL Hardware, Its state & fate |
Sep 7 2012, 07:26 AM
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#181
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Junior Member Group: Members Posts: 22 Joined: 10-August 12 From: Australia Member No.: 6530 |
This is a mildly off-topic post (although relevant to MSL hardware), but something that I haven't been able to resolve by searches here & elsewhere. After backshell separation, the descent stage employs all 8 MLEs until closer to the surface when only 4 are needed. Were the flight/control software + harware designed to handle failure or non-ignition of one (or more) MLE when all 8 were initially needed? Or would that have resulted in too much assymmetric thrust? Cheers! Dean |
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Sep 7 2012, 03:09 PM
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#182
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Junior Member Group: Members Posts: 31 Joined: 10-August 12 Member No.: 6526 |
Just one more, this is a close up of the sky crane impact site. You can make out quite a large chunk that ends up in the upper left corner:
Also, I posted a 3D stereo pair of this in a thread I started on tips for viewing them. Mark |
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Sep 7 2012, 09:09 PM
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#183
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Junior Member Group: Members Posts: 21 Joined: 21-September 07 From: Seattle Member No.: 3912 |
A crude approximation of what the debris field would look like had the Descent Stage impacted at the minimum safe distance of 150 meters from the Rover. ("Flight of the Mars Sky Crane", Cockrell School of Engineering, The University of Texas at Austin. Singh et al. give 200 meters.)
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Sep 7 2012, 09:59 PM
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#184
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
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Sep 15 2012, 11:26 PM
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#185
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Member Group: Members Posts: 222 Joined: 7-August 12 From: Garberville, CA Member No.: 6500 |
In response to "MarsInMyLifetime's" post here, yes I took note of that when stitching together the Sol 36 mosaic. Combined with the better positioning and the resolution of MC100 this is the best view we've gotten thus far of the potential heat shield location (pic below), but as for whether it's visible or not, I'm hesitant on that. It looks from HiRISE as if it's well down inside a small crater. Still, the darkish material we're seeing up along the rim of the crater could very well be impact residue. And I'm pretty sure, as I previously illustrated in this post that that's the location of the heat shield. It's probably not on the itinerary, but if Curiosity were to amble over there and peer into the crater it'd sure be interesting to see the condition of the HS wouldn't it?
-------------------- "We shall not cease from exploration, and the end of all our exploring will be to arrive where we started and know the place for the first time." -T.S. Eliot
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Sep 16 2012, 01:42 AM
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#186
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Member Group: Members Posts: 148 Joined: 9-August 11 From: Mason, TX Member No.: 6108 |
It's probably not on the itinerary, but if Curiosity were to amble over there and peer into the crater it'd sure be interesting to see the condition of the HS wouldn't it? I'm so used to the relative smoothness of Meridiani Planum, this surface looks pretty rough to get through, so I'll pass! If I were an engineer, though, I'd be more interested in the backshell and parachute site since these kinds of EDL artifacts have not been visited before. Edited to add to your analysis. This excellent 3D enlargement by marswiggle makes clear that the article is indeed in a depression, and that the smudge is from residue that we are seeing on the far side of that crater. I'm pretty certain now that this is the best we'll see of that hardware. http://www.unmannedspaceflight.com/index.p...st&p=190716 -------------------- --
Don |
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Dec 6 2012, 12:23 AM
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#187
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Junior Member Group: Members Posts: 55 Joined: 8-November 06 From: Indiana, USA Member No.: 1337 |
I had no idea finding the cruise stage was an option... http://www.nasa.gov/mission_pages/MRO/mult...a/pia16456.html
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Dec 6 2012, 01:45 AM
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#188
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Senior Member Group: Members Posts: 2083 Joined: 13-February 10 From: Ontario Member No.: 5221 |
Kudos to the Hirise team for a successful search!
And before anyone asks, the cruise stage and the weights are all way off to the west, even more out of Curiosity's way than the later dropped weights, which hit the slopes Mt. Sharp downrange. Even they would require going around that dune field to reach for a closer look. |
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Dec 6 2012, 01:49 AM
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#189
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Senior Member Group: Members Posts: 2511 Joined: 13-September 05 Member No.: 497 |
Kudos to the Hirise team for a successful search! Read it again, CTX found the targets; HiRISE just got higher-res views of them. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Dec 6 2012, 02:17 AM
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#190
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Senior Member Group: Members Posts: 2083 Joined: 13-February 10 From: Ontario Member No.: 5221 |
Yes, I misread it; credit to the whole MRO team is what I meant. Considering the browser-breaking size of images from either camera, the manual search must have taken up many hours nevertheless.
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Dec 6 2012, 03:01 PM
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#191
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Solar System Cartographer Group: Members Posts: 10154 Joined: 5-April 05 From: Canada Member No.: 227 |
-------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Dec 6 2012, 03:59 PM
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#192
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Junior Member Group: Members Posts: 85 Joined: 5-September 12 Member No.: 6635 |
Since another more or less identical EDL sequence might fly in 2018-2020 would a visit to some of the closer artifacts be justified? I don't remember either MER visiting a backshell or parachute for instance. We might learn something.
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Dec 6 2012, 04:42 PM
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#193
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
Maybe I was asleep at the wheel, but I thought Oppy did. http://marsrovers.jpl.nasa.gov/gallery/pre...L257-B367R1.jpg Some of teh crud on her FHAZ was collected there? Uh, maybe we used the MI as well? http://marsrovers.jpl.nasa.gov/gallery/all...unity_m358.html But I don't know, I could be mistaken.
Paolo -------------------- Disclaimer: all opinions, ideas and information included here are my own,and should not be intended to represent opinion or policy of my employer.
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Dec 6 2012, 05:04 PM
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#194
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Senior Member Group: Members Posts: 2083 Joined: 13-February 10 From: Ontario Member No.: 5221 |
Eyesonmars said backshell and parachute; there has been no close visits by either of the MERs. A combination of being too out of the way and the danger of entanglement were the reasons, I recall... Probably the same for MSL.
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Dec 6 2012, 05:37 PM
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#195
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
Since another more or less identical EDL sequence might fly in 2018-2020 would a visit to some of the closer artifacts be justified? The heatshield? No. Phenolic Impregnated CARBON Ablator. Moreover, it was very well instrumented using the MEDLI suite so it's performance can be measured and understood already. Backshell? It did it's job - that's enough. parachute? We saw how well it did thanks to HiRISE, and, moreover, the deceleration performance that will have been recorded via IMU's Skycrane? Well - there's not much point as it's just a football field sized debris zone - and lots of Hyrdazine lying around. |
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