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MSL development & assembly, Until it's shipped to the Cape
tharrison
post Jul 2 2010, 06:36 PM
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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. rolleyes.gif


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MahFL
post Jul 6 2010, 02:46 PM
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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. rolleyes.gif


Can you supply a reference to backup that statement ?
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BrianL
post Jul 8 2010, 10:38 PM
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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. smile.gif
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sgendreau
post Jul 9 2010, 05:29 PM
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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. rolleyes.gif



The drivers can overrule the science team when deciding where to go? How's that?
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punkboi
post Jul 9 2010, 07:10 PM
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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. biggrin.gif)

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.


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elakdawalla
post Jul 9 2010, 07:32 PM
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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.


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djellison
post Jul 9 2010, 08:19 PM
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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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nprev
post Jul 10 2010, 12:55 AM
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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! wink.gif


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Mirek
post Jul 13 2010, 08:28 PM
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MSL spins its wheels for the first time (July 9th 2010).

http://tinyurl.com/2ej2l26

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nprev
post Jul 14 2010, 12:21 AM
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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?


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ElkGroveDan
post Jul 14 2010, 01:24 AM
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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.


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nprev
post Jul 14 2010, 01:44 AM
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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.


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Pavel
post Jul 14 2010, 02:10 AM
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I guess martian rocks would eventually get stuck in the holes and increase the surface contact area rolleyes.gif
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toddbronco2
post Jul 14 2010, 03:22 PM
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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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charborob
post Jul 14 2010, 04:03 PM
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Unnecessary quote removed Admin

Translation: "JPL".
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