Winter campaign at Cook Haven, Sol 3512 - 3599 (December 13, 2013 - March 10, 2014) |
Winter campaign at Cook Haven, Sol 3512 - 3599 (December 13, 2013 - March 10, 2014) |
Dec 13 2013, 04:31 AM
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#1
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Senior Member Group: Moderator Posts: 3431 Joined: 11-August 04 From: USA Member No.: 98 |
She's there! Opportunity drove down to the "Cook Haven" bright outcrops on Sol 3512.
Even better, news via Twitter that currents on the front right wheel are back to normal. Phew. |
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Jan 21 2014, 08:39 PM
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#2
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Senior Member Group: Members Posts: 4256 Joined: 17-January 05 Member No.: 152 |
The main problem with propelling PI is converting the very slow rover and wheel movement into rapid PI movement, and what you're saying about the rock inside the wheel hitting the "tipping point" as the wheel rotates sounds like it would do that. Getting PI out of the wheel sounds trickier. The wheel being on a slope might help - with the right tilt, PI would move outwards as well as downwards once it started to slide inside the wheel. You could use basic physics to work out PI's maximum speed as it left the wheel. Friction would make it slower though.
It would help to know exactly where PI came from and how far that is from it's current location. We have a candidate "divot" - it shouldn't be too hard to estimate the distance from there to it's current location. Of course turning in place and driving can do multiple damage to the ground, so the visible divot may be unrelated to PI, and the real source may be underneath us and invisible, at least until we move again. |
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Jan 23 2014, 04:53 PM
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#3
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
The main problem with propelling PI is converting the very slow rover and wheel movement into rapid PI movement, ... From my observations of the testbed when driving and turning on hard surfaces, the right rocker can store large amounts of energy in the deflection during a turn or a drive. When the energy gets released it is released in a very short amount of time and has quite a punch. So *I* would not be surprised if PI was kicked by the RF wheel using energy stored in the strut during a maneuver. See, not only the rock was moved, but also turned upside down, I think. I doubt we will ever know what really happened. I also think that Oppy is just trying to steal some of the attention Curry is getting. 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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Jan 23 2014, 09:13 PM
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#4
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Member Group: Members Posts: 866 Joined: 15-March 05 From: Santa Cruz, CA Member No.: 196 |
From my observations of the testbed when driving and turning on hard surfaces, the right rocker can store large amounts of energy in the deflection during a turn or a drive. When the energy gets released it is released in a very short amount of time and has quite a punch. So *I* would not be surprised if PI was kicked by the RF wheel using energy stored in the strut during a maneuver. See, not only the rock was moved, but also turned upside down, I think. I doubt we will ever know what really happened. I also think that Oppy is just trying to steal some of the attention Curry is getting. Paolo Very interesting and illuminating Paolo. I had visions of this monotonously slow crawl, its good to know Oppy has some 'spunk' in its legs! In the dislodged rock from marsophile's 'Before and after' sequence a few posts above, the area 'kicked up' is so flat that it is surprising a rock could have been pulled up, as its definitely a rock and not a 'divot' as evident in the xeye below. That it was actually exhumed without any apparent prominent feature that the wheel could 'hook' onto to pull it up so the wheel must have had to dig in to something at just the right place to pull it up. That said, it doesn't seem obvious as the source for PI, though there isn't enough detail to be sure, its could be a broke-off section of it.. |
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