Post Solar Conjunction/Santorini Study Drive, The second leg in our Journey to Endeavor Crater |
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Post Solar Conjunction/Santorini Study Drive, The second leg in our Journey to Endeavor Crater |
 Feb 18 2009, 11:52 AM
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#316
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Senior Member  Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253  |
If I understood correctly there is no problem with driving backwards; the limitation is driving backwards in Autonav mode.
In another topic, those pancam shots taken during sol 1797 and looking on the general direction of Endeavor were finally downlinked on the last session. Look for the images labelled like "1PxxxxESF97PRP2409" here: http://nasa.exploratorium.edu/mars/opportu...cam/2009-02-17/. 01797::p2409::19::16::16::0::0::1::33::pancam_endeavor_look_R12 |
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Feb 18 2009, 01:23 PM
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#317
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 The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
New rover poem here if anyone wants a look...
http://astropoetry.wordpress.com/2009/02/1...fter-five-years -------------------- |
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Feb 18 2009, 01:59 PM
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#318
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 Member Group: Members Posts: 813 Joined: 8-February 04 From: Arabia Terra Member No.: 12 |
QUOTE (Tesheiner @ Feb 18 2009, 11:52 AM)  If I understood correctly there is no problem with driving backwards; the limitation is driving backwards in Autonav mode.   Makes me wonder what's more dangerous; backwards driving with no autonav or forwards driving with the risk of losing the use of the RF wheel. |
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Feb 18 2009, 02:04 PM
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#319
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 Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
QUOTE (Geert @ Feb 17 2009, 09:37 PM) ... On Spirit I'm always amazed that the 'stuck' wheel is really 'stuck', it is not turning at all, normally with a burnt electro motor you would expect that you could still turn it (even though it would show some resistance), but it looks like the wheel is full on the break, everything would be a lot easier if it would turn at least a bit... ... That's because of the gears between the motor and the wheel. Too much friction! 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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Feb 18 2009, 02:10 PM
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#320
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
QUOTE (Nirgal @ Feb 18 2009, 03:10 AM) Probably I'm missing something but if I remember correctly then wasn't Oppy used to regularly alternate between forward and backward driving for better "wear distribution" anyway ? Or has it something to do with the stuck IDD or the new flight software that could make regular backward-driving more difficult ... ? Autonav cannot be sequenced by driving backwards since we have to use the NAVCAMs to look at the obstacles (there isn't enough texture for the HAZCAMs) and the LGA is in the field of view. Yes we used to alternate back and forward driving but if we want to make some serious progress we need to use Autonav. That would force us to drive ackwars blind, do a 180deg turn and then drive with Autonav. The issue is the 180 deg turn. It is a large turn and it would put quite a bit of stress on the RF wheel. This is why so far we drove forwards. Pre Conjunction we did some drives with backwards blind, turn 180, Autonav. It might be that we have to resume that strategy. 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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Feb 18 2009, 02:14 PM
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#321
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
QUOTE (SFJCody @ Feb 18 2009, 05:59 AM) Makes me wonder what's more dangerous; backwards driving with no autonav or forwards driving with the risk of losing the use of the RF wheel. There is no more danger in driving backwards blind. In fact under certain conditions it is safer to drive backwards! 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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Feb 18 2009, 09:24 PM
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#322
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Member Group: Members Posts: 530 Joined: 21-March 06 From: Canada Member No.: 721 |
QUOTE (Tesheiner @ Feb 18 2009, 05:52 AM) those pancam shots taken during sol 1797 and looking on the general direction of Endeavor were finally downlinked Umm.... does anyone see anything that might be Endeavour?
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Feb 18 2009, 10:14 PM
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#323
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 Senior Member Group: Members Posts: 4247 Joined: 17-January 05 Member No.: 152 |
I couldn't see Endeavour in those pancams. We have seen parts of the rim recently in navcam, though. The most recent view I've noticed was sol 1794:
http://marsrovers.jpl.nasa.gov/gallery/all...A0P1615R0M1.JPG Anyone know how the azimuths of the sol 1797 pancams compare with this navcam view? |
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Feb 18 2009, 10:31 PM
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#324
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 Special Cookie Group: Members Posts: 2168 Joined: 6-April 05 From: Sintra | Portugal Member No.: 228 |
QUOTE (fredk @ Feb 18 2009, 10:14 PM) I couldn't see Endeavour in those pancams. Hum...maybe I'm seing things but isn't Endeavour present in this image? http://qt.exploratorium.edu/mars/opportuni...00P2404L2M3.JPG -------------------- "Ride, boldly ride," The shade replied, "If you seek for Eldorado!"
Edgar Alan Poe |
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Feb 18 2009, 11:16 PM
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#325
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 Senior Member Group: Moderator Posts: 3431 Joined: 11-August 04 From: USA Member No.: 98 |
QUOTE (fredk @ Feb 18 2009, 03:14 PM) Anyone know how the azimuths of the sol 1797 pancams compare with this navcam view? The double-bump feature in the Navcam is around azimuth 91 or 92. That's about one-third of the way from the left in the first Pancam image (1p287716558esf97prp2409r2m1). I don't see anything. |
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Feb 19 2009, 11:07 AM
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#326
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Special Cookie Group: Members Posts: 2168 Joined: 6-April 05 From: Sintra | Portugal Member No.: 228 |
looking at Tesheiner's latest route map I can't avoid to suggest a song to go along with it...good mood!
 Here's my own updated map...  http://i16.photobucket.com/albums/b14/ustr...01_leg2_01f.jpg -------------------- "Ride, boldly ride," The shade replied, "If you seek for Eldorado!"
Edgar Alan Poe |
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Feb 20 2009, 10:30 AM
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#327
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
Here's an interesting note included in the latest status report: "The plan for the near term is to drive backward to see if that improves performance of the right-front wheel, although backward driving will limit the distance traveled each sol."
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Feb 20 2009, 01:36 PM
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#328
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
QUOTE (Tesheiner @ Feb 20 2009, 02:30 AM) Here's an interesting note included in the latest status report: "The plan for the near term is to drive backward to see if that improves performance of the right-front wheel, although backward driving will limit the distance traveled each sol." Well, you are not seeing 160m drives for some time but we have done quite long blind drives. I believe I have done a 120-140m blind once. 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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Feb 20 2009, 02:30 PM
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#329
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Member Group: Members Posts: 713 Joined: 30-March 05 Member No.: 223 |
QUOTE (RoverDriver @ Feb 20 2009, 02:36 PM) Well, you are not seeing 160m drives for some time but we have done quite long blind drives. I believe I have done a 120-140m blind once. Paolo That's no problem: Even 100 meters/sol is incredibly fast progress if it can be regularly sustained over a substantial amount of time (in particular when taking fully advantage of non-restricted sols) ... Looking forward to a streak of several weeks of continuous 50-100 meters/sol drives ... which would already bring us in reach of the "parking lot" terrain  |
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Feb 20 2009, 03:53 PM
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#330
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 Member Group: Members Posts: 236 Joined: 5-June 08 From: Udon Thani Member No.: 4185 |
QUOTE (RoverDriver @ Feb 20 2009, 08:36 PM) Well, you are not seeing 160m drives for some time but we have done quite long blind drives. I presume that in blind drives the usual "emergency stops" like maximum tilt and wheel slippage are still operating? |
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