To the Cape!, Quackmire and arm troubles |
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To the Cape!, Quackmire and arm troubles |
 Apr 14 2008, 08:31 AM
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#76
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Senior Member  Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253  |
QUOTE (fredk @ Apr 13 2008, 06:47 PM)  Seriously, though, at least some of the other wheels seem to be on pretty firm ground (right rear especially). Are you sure? Unless my eyes are playing me a trick it looks like the right-rear wheel (left on the images) is not even touching the ground but is floating. |
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Apr 14 2008, 11:49 AM
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#77
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Member Group: Members Posts: 530 Joined: 21-March 06 From: Canada Member No.: 721 |
What sort of physical situation can cause a rear wheel to come off the ground in this system, and is such a situation possible where it is?
Brian |
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Apr 14 2008, 11:57 AM
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#78
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
The middle wheel digging in will do that quite easily.
Doug |
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Apr 14 2008, 12:07 PM
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#79
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 Senior Member Group: Moderator Posts: 2262 Joined: 9-February 04 From: Melbourne - Oz Member No.: 16 |
If you compare the latest rhaz with some from a few sols ago you can see that the right rear has 'moved up' significantly. So it does look like the middle right has started to dig in.
 Conversely though, it looks like the opposite is happening on the left side which may be a good sign (slightly nervous  )James -------------------- |
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Apr 14 2008, 03:12 PM
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#80
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 Senior Member Group: Members Posts: 4246 Joined: 17-January 05 Member No.: 152 |
QUOTE (Tesheiner @ Apr 14 2008, 08:31 AM) ...it looks like the right-rear wheel (left on the images) is not even touching the ground but is floating. Yikes. It looks like you're right.  You can see that fairly clearly from an anaglyph:
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Apr 14 2008, 03:36 PM
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#81
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 Senior Member Group: Members Posts: 1619 Joined: 12-February 06 From: Bergerac - FR Member No.: 678 |
Good catch Fredk. I had the impression by looking at the pictures and I didn't have the idea of the analgyph. And it's clear that the rear-left wheel is above the ground. I'm wondering if it's not the middle-left wheel who is deeply inserted into the ground, and she cause an elevation on rear wheel.
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Apr 14 2008, 06:42 PM
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#82
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Member Group: Members Posts: 910 Joined: 4-September 06 From: Boston Member No.: 1102 |
The rocker bogie system is great for getting over uneven surfaces as long as they are solid. Unfortunately, there is no way to lock it (or move it) to a 6 flat wheel position for digging out of traps (sort of like 4 wheel drive on a car with differential locked to prevent slipping).
Opportunity's problem, and Spirit getting stuck in the bowl on top of home plate, may cause some re-thinking about rocker bogie designs for future rovers. -Floyd -------------------- |
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Apr 14 2008, 07:41 PM
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#83
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 The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
Next section of the latest pan...
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Apr 15 2008, 03:27 AM
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#84
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Senior Member Group: Members Posts: 4246 Joined: 17-January 05 Member No.: 152 |
From The Martian Chronicals:
QUOTE Opportunity has been carefully extracting herself from a difficult little sand trap on the slope of Duck Bay in Victoria crater, but should be free and driving again sometime this week. Also there are nice new versions of the Cape Verde pan on that site.
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Apr 15 2008, 03:13 PM
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#85
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Senior Member Group: Members Posts: 4246 Joined: 17-January 05 Member No.: 152 |
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Apr 15 2008, 03:19 PM
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#86
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
****
 I'll get the low res MER model out when I get home and see what you have to do to the rocker bogie to make that happen. It's more motion than the height of the whole wheel imho. Doug |
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Apr 15 2008, 03:22 PM
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#87
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 Member Group: Members Posts: 578 Joined: 5-November 04 From: Denmark Member No.: 107 |
-------------------- "I want to make as many people as possible feel like they are part of this adventure. We are going to give everybody a sense of what exploring the surface of another world is really like"
- Steven Squyres |
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Apr 15 2008, 03:52 PM
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#88
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 Special Cookie Group: Members Posts: 2168 Joined: 6-April 05 From: Sintra | Portugal Member No.: 228 |
Looks R-E-A-L-L-Y high to me Doug...
Didn't the ground collapsed on Oppy's front left?... -------------------- "Ride, boldly ride," The shade replied, "If you seek for Eldorado!"
Edgar Alan Poe |
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Apr 15 2008, 04:18 PM
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#89
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
Not front left. Middle right.
Doug |
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Apr 15 2008, 05:37 PM
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#90
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 Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Good grief!!!
That ain't right at all!!!
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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