MSL development & assembly, Until it's shipped to the Cape |
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MSL development & assembly, Until it's shipped to the Cape |
 Jul 2 2010, 06:36 PM
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#31
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 Junior Member  Group: Members Posts: 46 Joined: 6-January 10 From: Toronto, ON Member No.: 5163  |
QUOTE (MahFL @ Jul 2 2010, 03:46 AM)  I doubt there can ever be a wheeled vehicle that cannot be trapped in some hellish sand trap. No doubt the drivers though will be very carefull. Well, the drivers were the ones that got Spirit stuck...the science team folks told them not to drive in the sandy area where it got stuck but they did it anyway. 
-------------------- Twitter: @tanyaofmars
Web: http://www.tanyaofmars.com |
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Jul 6 2010, 02:46 PM
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#32
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 Forum Contributor Group: Members Posts: 1374 Joined: 8-February 04 From: North East Florida, USA. Member No.: 11 |
QUOTE (tharrison @ Jul 2 2010, 06:36 PM) Well, the drivers were the ones that got Spirit stuck...the science team folks told them not to drive in the sandy area where it got stuck but they did it anyway. Can you supply a reference to backup that statement ? |
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Jul 8 2010, 10:38 PM
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#33
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Member Group: Members Posts: 530 Joined: 21-March 06 From: Canada Member No.: 721 |
Would you ask Scott Maxwell for a reference every time he tweets something? Insider info is good enough for me. I guess I'm just a trusting soul.
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Jul 9 2010, 05:29 PM
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#34
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Junior Member Group: Members Posts: 79 Joined: 11-September 09 Member No.: 4937 |
QUOTE (tharrison @ Jul 2 2010, 11:36 AM) Well, the drivers were the ones that got Spirit stuck...the science team folks told them not to drive in the sandy area where it got stuck but they did it anyway. The drivers can overrule the science team when deciding where to go? How's that? |
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Jul 9 2010, 07:10 PM
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#35
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 Member Group: Members Posts: 540 Joined: 25-October 05 From: California Member No.: 535 |
QUOTE (sgendreau @ Jul 9 2010, 09:29 AM) The drivers can overrule the science team when deciding where to go? How's that? Safety reasons. The drivers are obviously the ones controlling the vehicle. They should call the shots. (Though this goes against what tharrison posted above.  )Much as how a landing site (for Phoenix, MER, MSL or whatever) that's proposed by the science team can be disapproved by the engineering team if the site is deemed too hazardous. -------------------- 2011 JPL Tweetup photos: http://www.rich-parno.com/aa_jpltweetup.html
http://human-spaceflight.blogspot.com |
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Jul 9 2010, 07:32 PM
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#36
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 Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
If you read Scott Maxwell's blog, you'll get a feel for how the scientists' job is to pick destinations, not routes; the drivers' job is to route the rover to the destination safely -- or to tell the scientists it can't be done because it can't be done safely. If you read Scott's blog you'll also get a feel for how much he hates to say things can't be done. If there's a way to do it safely, they'll find it. But then it may take too much time and the scientists will decide it's not worth it. There is a great deal of give-and-take in the daily process of planning the rovers' driving.
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Jul 9 2010, 08:19 PM
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#37
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Founder Group: Chairman Posts: 14448 Joined: 8-February 04 Member No.: 1 |
Worth noting in the case of spirit - Scientists have explicitly said that they didn't see Spirit's current sand trap coming.
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Jul 10 2010, 12:55 AM
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#38
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 Merciless Robot Group: Admin Posts: 8789 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
One other thing worth noting: This is no-kidding exploration of an alien planet in its purest sense, and the MERs have not only survived long beyond expectations but surmounted numerous unexpected obstacles. This does not presuppose a magic ability to see things coming in an alien environment, but does speak volumes about the talent of the team.
Hell, if I was driving the MERs we'd have been lucky to get off the descent stages, and I'd probably have a couple of DUIs! 
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Jul 13 2010, 08:28 PM
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#39
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 Junior Member Group: Members Posts: 39 Joined: 19-August 09 From: Dallas Member No.: 4905 |
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Jul 14 2010, 12:21 AM
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#40
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Merciless Robot Group: Admin Posts: 8789 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Awesome. She's looking like a no-kidding rover now!!!
Question: What's the deal with the wheels re that one region on each that has no tread, just connecting strips + holes? Is that for mass savings, or perhaps an artifact of the fabrication process, or is there an operational reason? -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Jul 14 2010, 01:24 AM
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#41
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 Senior Member Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197 |
I was under the impression that like the MERs, the interrupted tread pattern was for optical navigation purposes but I can't cite the source of that information offhand.
-------------------- If Occam had heard my theory, things would be very different now.
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Jul 14 2010, 01:44 AM
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#42
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Merciless Robot Group: Admin Posts: 8789 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Sounds logical. I'm kind of surprised at the size of the holes, though; definitely a major decrease in surface contact area over, what, maybe 30 deg of the circumference?
Obviously there's more than enough margin, though; if one wheel slips, odds are that all the rest won't have their holed regions on the surface at the same time. -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Jul 14 2010, 02:10 AM
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#43
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 Member Group: Members Posts: 160 Joined: 4-July 05 From: Huntington Beach, CA, USA Member No.: 429 |
I guess martian rocks would eventually get stuck in the holes and increase the surface contact area
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Jul 14 2010, 03:22 PM
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#44
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Junior Member Group: Members Posts: 33 Joined: 25-March 10 Member No.: 5281 |
QUOTE (nprev @ Jul 13 2010, 05:21 PM) Awesome. She's looking like a no-kidding rover now!!! Question: What's the deal with the wheels re that one region on each that has no tread, just connecting strips + holes? Is that for mass savings, or perhaps an artifact of the fabrication process, or is there an operational reason? You guys are going to love this (I was clued into it by a guy on the MSL ATLO team)! There's a Morse code message hidden in those gaps. The video shows it pretty clearly too, though I guess the pattern is backwards if you look at the rover from the front .--- .--. .-.. |
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Jul 14 2010, 04:03 PM
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#45
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Senior Member Group: Members Posts: 1075 Joined: 21-September 07 From: Québec, Canada Member No.: 3908 |
Unnecessary quote removed Admin
Translation: "JPL". |
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