4th leg in the trek to Endeavour, After science stop @ Kasos |
4th leg in the trek to Endeavour, After science stop @ Kasos |
Jun 2 2009, 09:12 PM
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#46
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Senior Member Group: Members Posts: 2922 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 |
Wondering if those regular 70m drives have something to do with the RF lubrication issue?
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Jun 2 2009, 09:46 PM
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#47
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Senior Member Group: Members Posts: 4256 Joined: 17-January 05 Member No.: 152 |
I think the answer is yes. From the latest PS update:
QUOTE "The currents are still elevated and so we're limiting most drives to 50 meters, which tends to be completed within about an hour." The engineers are also trying out a new strategy of driving shorter distances. "We're trying to do a couple of things here," [Matijevic] said. "We're trying to figure out if we can drive shorter distances and drive more days without elevating the current in the actuators as has been happening on the longer, 100-to-150-meter drives."
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Jun 2 2009, 10:21 PM
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#48
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Member Group: Members Posts: 279 Joined: 19-August 07 Member No.: 3299 |
However, it is possible to advance two hops of 50 meters each one after a pause of 2-3 hours to cool things?
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Jun 2 2009, 11:02 PM
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#49
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
Probably yes, but in that case the evening communication session would be missed, I'm afraid.
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Jun 2 2009, 11:37 PM
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#50
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
However, it is possible to advance two hops of 50 meters each one after a pause of 2-3 hours to cool things? 2-3 hours won't do much. Over the Memorial Weekend we had a 4 Sols pause and the RF currents came downa bit just to jump right back at the same level. I think we just have to live with it. 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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Jun 3 2009, 07:47 AM
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#51
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Member Group: Members Posts: 713 Joined: 30-March 05 Member No.: 223 |
QUOTE drive shorter distances and drive more days Yes that seems like a sensible approach that ensures slower but sure & steady progress ... 50 meters at each driveable sol plus keeping the intermediate science stops short (like one week instead of 4+ weeks thus sparing the more complex science tasks and IDD hardware wear for the ultimate loooong science stop at Endeavour |
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Jun 6 2009, 12:55 PM
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#52
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
That was kind of short. Giving the motors a rest? The current status report has some tidbits related to that 30m drive and the current strategy: QUOTE On Sols 1900, 1902 and 1904 (May 29, May 31 and June 2, 2009), Opportunity drove 66, 71 and 74 meters, (217, 233 and 243 feet), respectively. On Sol 1905 (June 3, 2009), the rover only accomplished about 30 meters (98 feet) of driving before the time ran out. Activities were very time-constrained on that sol.
Motor currents in the right-front wheel continue to be elevated. Limiting the drive distance and employing regular, short, backward slip checks seems to mitigate further increases in right-front wheel current. |
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Jun 6 2009, 02:05 PM
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#53
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
RF wheel currents were beginning to trend upwards again so the drivers on shift decided to start driving backwards again and rest for a while.
There is some challenging terrain about 500m ahead and we will have to sit and think which way to go. This next resting period will come in handy for that. 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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Jun 7 2009, 10:16 AM
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#54
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Member Group: Members Posts: 813 Joined: 8-February 04 From: Arabia Terra Member No.: 12 |
There is some challenging terrain about 500m ahead and we will have to sit and think which way to go. It does look tricky. My favourite route at the moment would be something like this, using patches of bedrock to move east and moving south when in areas where the drift material looks dangerous.
Attached File(s)
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Jun 7 2009, 01:54 PM
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#55
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
It does look tricky. My favourite route at the moment would be something like this, using patches of bedrock to move east and moving south when in areas where the drift material looks dangerous. How about that! We are considering a path similar to that one but most of the drivers prefer a path that goes all around (westward) the area of Purgatoids that is just south of the rover. 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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Jun 7 2009, 03:23 PM
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#56
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Member Group: Members Posts: 530 Joined: 21-March 06 From: Canada Member No.: 721 |
To my eye, angling south-west now, then proceeding close to the edges of the HiRISE photo south then east seems to offer the cleanest route to the really nice looking terrain in the eastern third of the shot. Is that the way being favoured?
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Jun 7 2009, 03:32 PM
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#57
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
To my eye, angling south-west now, then proceeding close to the edges of the HiRISE photo south then east seems to offer the cleanest route to the really nice looking terrain in the eastern third of the shot. Is that the way being favoured? Yes. Still the route has not been decided yet. We will use the next resting period to analyze the HiRISE in detail and come to a conclusion on which route to take. 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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Jun 7 2009, 04:42 PM
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#58
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Senior Member Group: Members Posts: 2922 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 |
Yes. Still the route has not been decided yet. We will use the next resting period to analyze the HiRISE in detail and come to a conclusion on which route to take. Paolo So, you don't trust Rui's! Realy? -------------------- |
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Jun 7 2009, 04:48 PM
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#59
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
> the next resting period ...
Is it at that outcrop 200m to the south? |
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Jun 7 2009, 05:17 PM
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#60
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
> the next resting period ... Is it at that outcrop 200m to the south? No, I think we will stop at the end of the next drive. Wherever that might be. 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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