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The West Valley Route
john_s
post Mar 25 2009, 12:25 AM
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QUOTE (RoverDriver @ Mar 24 2009, 05:23 PM) *
Since Sol A 779 we drove about 859 m. I doubt the RF wheel has worn out significantly. It definitely is not like this.

Paolo


Amazing video! I guess physics is a bit different at 200 mph than at 0.1 mph.

I wonder if anyone has considered going out in the arroyo at JPL and actually trying the wheel-dragging experiment? Could be a fun lunchtime project, though only if there are rover wheels, or equivalents, available for sacrifice...

John.
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Geert
post Mar 25 2009, 12:32 AM
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QUOTE (ElkGroveDan @ Mar 25 2009, 03:47 AM) *
It looks like Spirit's trying to build a canal.


I wonder if Mars will manage to erase this.
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dvandorn
post Mar 25 2009, 12:46 AM
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QUOTE (ElkGroveDan @ Mar 24 2009, 05:22 PM) *
Probably just a few remains of shrimp tails and a couple of empty Fosters cans that you guys brought from Down Under.

There goes the concept of guarding against terrestrial contamination on Mars!
wink.gif

-the other Doug


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RoverDriver
post Mar 25 2009, 01:57 AM
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QUOTE (john_s @ Mar 24 2009, 05:25 PM) *
Amazing video! I guess physics is a bit different at 200 mph than at 0.1 mph.

I wonder if anyone has considered going out in the arroyo at JPL and actually trying the wheel-dragging experiment? Could be a fun lunchtime project, though only if there are rover wheels, or equivalents, available for sacrifice...

John.


Just outside the ISIL (the sandbox where we have the engineering model) there is a paved parking lot. I drove the testbed both in the Opportunity and Spirit configurations. In both configurations it sends chills down my spine. Sure, the different gravity field makes quite a difference, still it is not a pretty sight (or sound). In case you ask, this was done when I did the testing of driving with the IDD unstowed.

Paolo


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RoverDriver
post Mar 25 2009, 02:02 AM
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QUOTE (Geert @ Mar 24 2009, 05:32 PM) *
I wonder if Mars will manage to erase this.


No questions about it. Give it 30-50 years and all tracks from both vehicles will be erased. Even Purgatory and Tyrone. The RAT holes will last longer. Hopefully someONE will see them in person before they get erased. It is quite intimidating thinking that the holes I helped drill on Mars will last quite a bit more than I will.

Paolo


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Tesheiner
post Mar 25 2009, 09:24 AM
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This is from Scott Maxwell's blog "Mars and Me" entry for sol 80 i.e. five years ago:

"... Basically the entire extended mission will be devoted to exploring the Columbia Hills. Of course, first we have to get there, or try to. They're planning 60 sols, plus 30 contingency sols, for that. Over the next few days, they'll try to work out how long it will take to drive there, and how long Spirit is likely to last. This will tell them how much time they have left over to do science at random targets of interest along the way."

smile.gif
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MahFL
post Mar 25 2009, 12:43 PM
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QUOTE (RoverDriver @ Mar 24 2009, 11:05 PM) *
We have refined a set of self correcting arcs that seem to work quite well...
Paolo


I think you reached perfection. Bravo !
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MahFL
post Mar 25 2009, 12:45 PM
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This is a nice view.

Crater rim.
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ElkGroveDan
post Mar 25 2009, 02:00 PM
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QUOTE (RoverDriver @ Mar 24 2009, 06:02 PM) *
The RAT holes will last longer. .... It is quite intimidating thinking that the holes I helped drill on Mars will last quite a bit more than I will.

Even on Earth you can find chiseled graffiti from hundreds of years ago in very exposed soft rocks. I can imagine a rat hole in basalt on Mars lasting a thousand years.

http://www.waymarking.com/waymarks/WM18ZQ


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fredk
post Mar 25 2009, 02:34 PM
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QUOTE (MahFL @ Mar 25 2009, 01:45 PM) *

Just to be clear, that's not the rim of Gusev, it's Grissom Hill and a few other features well within Gusev. But it is a spectacular view!
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Guest_Oersted_*
post Mar 25 2009, 03:26 PM
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QUOTE (BrianL @ Mar 24 2009, 11:01 PM) *
Well, if we can abrade it down to a nice, smooth surface, doesn't that solve part of the problem? biggrin.gif


The stuck wheel hasn't (just) been a problem, but has been the reason for probably the most important discovery from Spirit so far!
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ilbasso
post Mar 25 2009, 05:52 PM
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QUOTE (ElkGroveDan @ Mar 25 2009, 09:00 AM) *
Even on Earth you can find chiseled graffiti from hundreds of years ago in very exposed soft rocks...


...or from 4,600 years ago...
http://i407.photobucket.com/albums/pp155/t...09/IMG_3734.jpg


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climber
post Mar 25 2009, 06:14 PM
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15.000 years: http://www.culture.gouv.fr/fr/arcnat/lascaux/en/index3.html


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ilbasso
post Mar 25 2009, 06:35 PM
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Although maybe a little better protected in the cave! And we couldn't get the MERs down in a cave anyway...they're getting precious little sunlight as it is.


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Manning the LCC at http://www.apollolaunchcontrol.com
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HughFromAlice
post Mar 25 2009, 07:20 PM
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QUOTE (RoverDriver @ Mar 25 2009, 11:32 AM) *
Give it 30-50 years and all tracks from both vehicles will be erased.



I've often wondered how long it would take to erase the wheel tracks! Knowing the rate at which they are being erased in different soil types, wind regimes etc could give a lot of very interesting info on geological time frames. In fact, just from the tracks themselves there must be a lot of info (additional to the dragged wheel discoveries).

Is anyone studying this - any papers on it - earlier comments in UMSF - or any one got any comments on this?
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