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Jun 4 2005, 06:21 PM
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#1
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
This event deserves its own thread.
To quote the illustrious Dr. King -- "Free at last, free at last, thank God Almighty, we're free at last! So, how much y'all want to bet we'll stay here for a few sols, looking very carefully at the tracks and waiting for the MER Team to figure out how to proceed from here? -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Jun 15 2005, 09:17 AM
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#2
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Senior Member Group: Members Posts: 2870 Joined: 22-April 05 From: Ridderkerk, Netherlands Member No.: 353 |
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Jun 15 2005, 10:48 AM
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Member Group: Members Posts: 290 Joined: 26-March 04 From: Edam, The Netherlands Member No.: 65 |
Great image ! I don't understand though that they dare to move around this "quick sand" just like that ! I thought that driving oppy from now on would take ages.....It doesn't ! (which I like with respect to moving on, but on the other hand i'm afraid history repeats...
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Jun 15 2005, 11:05 AM
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#4
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Member Group: Members Posts: 713 Joined: 30-March 05 Member No.: 223 |
QUOTE (Marcel @ Jun 15 2005, 12:48 PM) Great image ! I don't understand though that they dare to move around this "quick sand" just like that ! I thought that driving oppy from now on would take ages.....It doesn't ! (which I like with respect to moving on, but on the other hand i'm afraid history repeats... just a thought: from this image it seems that the danger of digging in could be "simply" a function of the slope/steepness of the dune flanks (rather than soil composition differences) ... Oppy crossed the "flatter" dune in the foreground several times with no problems. The Flank of the "bad" dune (Purgatory) seems to get considerably steeper just where the wheels started to dig in (of course this could also be an optical illusion effect from the differnt perspective of the image) |
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Jun 15 2005, 04:47 PM
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#5
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Senior Member Group: Members Posts: 1636 Joined: 9-May 05 From: Lima, Peru Member No.: 385 |
QUOTE (Nirgal @ Jun 15 2005, 06:05 AM) just a thought: from this image it seems that the danger of digging in could be "simply" a function of the slope/steepness of the dune flanks (rather than soil composition differences) ... Oppy crossed the "flatter" dune in the foreground several times with no problems. The Flank of the "bad" dune (Purgatory) seems to get considerably steeper just where the wheels started to dig in (of course this could also be an optical illusion effect from the differnt perspective of the image) I agree it. The steeper, the rover needs greater velocity to overcome it. It is supposed that the rover has no accelerations but at slow and constant speed. Driving on sand dunes is very alike to flying. The pilot must know on where, when and how much is to accelerate or deaccelerate according to the slope pending, height and kind of sand. The case of Oppys, it must look for a less steep slope and a pavement martian land. Rodolfo |
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Jun 17 2005, 07:19 AM
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#6
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Member Group: Members Posts: 362 Joined: 12-June 05 From: Kiama, Australia Member No.: 409 |
QUOTE (RNeuhaus @ Jun 16 2005, 03:47 AM) I agree it. The steeper, the rover needs greater velocity to overcome it. It is supposed that the rover has no accelerations but at slow and constant speed. Driving on sand dunes is very alike to flying. Rodolfo Rodolfo, I think you are correct as you can see from this just how steep this dune face really was Richard |
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