IPB

Welcome Guest ( Log In | Register )

24 Pages V  « < 17 18 19 20 21 > »   
Reply to this topicStart new topic
Some Statistics for Spirit & Oppy, As the journey continues on Mars
brellis
post Jul 3 2012, 07:24 PM
Post #271


Member
***

Group: Members
Posts: 754
Joined: 9-February 07
Member No.: 1700



Watching the Curiosity "Dune Buggy" vid got me wondering -- there are lots of examples of wheels spinning in the deep stuff without any actual forward progress. What's the record for a downhill slide by a MER? Could it have happened descending into Victoria Crater?
Go to the top of the page
 
+Quote Post
RoverDriver
post Jul 3 2012, 10:23 PM
Post #272


Member
***

Group: Admin
Posts: 976
Joined: 29-September 06
From: Pasadena, CA - USA
Member No.: 1200



QUOTE (brellis @ Jul 3 2012, 11:24 AM) *
Watching the Curiosity "Dune Buggy" vid got me wondering -- there are lots of examples of wheels spinning in the deep stuff without any actual forward progress. What's the record for a downhill slide by a MER? Could it have happened descending into Victoria Crater?


We did not skid that much in Duck Bay. There was one instance, sol 1305 I think, where we were driving cross slope around 20-25 degrees and we slid sideways unexpectedly. One instance where I remember we did skid was in the approach to the western rim of Santa Maria. We were doing a "K" drive (partly backwards, then do a K turn, AKA three point turn?, and then drive forward to the rim, can't recall the Sol # possibly in the 2500's. I was the RP and we did get unexpected skid in the backwards portion of the drive. It is also difficult to determine how much of the skid is due to actual skidding and what part comes from the fact that the wheel diameter is about 25 cm when driving on soft soil while it is 26.5cm when driving on bedrock (this drive was mostly on bedrock), the difference in diameter stems from whether you include the grousers or not.

AFAIK we never driven on terrain that is so steep to cause skidding. Skidding would be worse than 100% slip. When you skid you have completely lost control of the vehicle path. The closest Oppy got to become a rock hugger was Wopmay in Endurance Crater, but even then we were driving cross-slope and managed to drive away.

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.
Go to the top of the page
 
+Quote Post
fredk
post Jul 3 2012, 10:58 PM
Post #273


Senior Member
****

Group: Members
Posts: 4245
Joined: 17-January 05
Member No.: 152



Fascinating as always, Paolo, thanks. For the record, Santa Caterina was an area on the N rim of Victoria. Was it the approach to Santa Maria where she skidded/slipped?
Go to the top of the page
 
+Quote Post
RoverDriver
post Jul 4 2012, 01:38 AM
Post #274


Member
***

Group: Admin
Posts: 976
Joined: 29-September 06
From: Pasadena, CA - USA
Member No.: 1200



QUOTE (fredk @ Jul 3 2012, 02:58 PM) *
Fascinating as always, Paolo, thanks. For the record, Santa Caterina was an area on the N rim of Victoria. Was it the approach to Santa Maria where she skidded/slipped?


You are correct. I will edit my post. Thank you for pointing this out.

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.
Go to the top of the page
 
+Quote Post
dilo
post Aug 17 2012, 07:43 AM
Post #275


Senior Member
****

Group: Members
Posts: 2492
Joined: 15-January 05
From: center Italy
Member No.: 150



Late update (vacations + MSL distracted me...):

Attached thumbnail(s)
Attached Image
 


--------------------
I always think before posting! - Marco -
Go to the top of the page
 
+Quote Post
brellis
post Sep 1 2012, 05:46 AM
Post #276


Member
***

Group: Members
Posts: 754
Joined: 9-February 07
Member No.: 1700



Opportunity has surpassed 35km of travel - universetoday article
QUOTE
the Opportunity rover keeps on trucking, and has now exceeded over 35 kilometers (21.75 miles) of driving on its odometer! Quite an accomplishment for the Energizer Bunny of Mars rovers, now operating for 3,057 Martian sols. As the MER team says, “Not bad for a vehicle designed for only about 1 kilometer (.6 miles) of distance and 90 sols (days) of lifetime.”
Go to the top of the page
 
+Quote Post
dilo
post Sep 21 2012, 01:09 PM
Post #277


Senior Member
****

Group: Members
Posts: 2492
Joined: 15-January 05
From: center Italy
Member No.: 150



Update:


Attached thumbnail(s)
Attached Image
 


--------------------
I always think before posting! - Marco -
Go to the top of the page
 
+Quote Post
climber
post Oct 4 2012, 10:57 AM
Post #278


Senior Member
****

Group: Members
Posts: 2917
Joined: 14-February 06
From: Very close to the Pyrénées Mountains (France)
Member No.: 682



Only numbers but well, another achievement: we just passed the 3000 sols after guarenty mark wheel.gif


--------------------
Go to the top of the page
 
+Quote Post
dilo
post Oct 12 2012, 05:09 PM
Post #279


Senior Member
****

Group: Members
Posts: 2492
Joined: 15-January 05
From: center Italy
Member No.: 150



Monthly update:
Attached Image

Compared to previous martian summer, daily energy budget decreased by 10%; considering that Tau and dust factor were almost the same, this suggests further cells/battery degradation.
Not sure if this could jeopardize next winter survival but I guess she will need a very good orientation station point in order to stay above 250W/sol... rolleyes.gif


--------------------
I always think before posting! - Marco -
Go to the top of the page
 
+Quote Post
fredk
post Oct 13 2012, 12:19 AM
Post #280


Senior Member
****

Group: Members
Posts: 4245
Joined: 17-January 05
Member No.: 152



The problem could be calibration. We've seen that before. The tau and dust factor values they give need some model of the dust on the pancam lens. They periodically update that model. I'd be surprized if the batteries degraded that quickly, but who knows...
Go to the top of the page
 
+Quote Post
dilo
post Nov 15 2012, 09:17 PM
Post #281


Senior Member
****

Group: Members
Posts: 2492
Joined: 15-January 05
From: center Italy
Member No.: 150



Monthly update:
Attached Image


--------------------
I always think before posting! - Marco -
Go to the top of the page
 
+Quote Post
dilo
post Dec 26 2012, 08:38 AM
Post #282


Senior Member
****

Group: Members
Posts: 2492
Joined: 15-January 05
From: center Italy
Member No.: 150



Late Monthly update (purpose is to align it at the change of month, as per MSL):
Attached Image



--------------------
I always think before posting! - Marco -
Go to the top of the page
 
+Quote Post
MoreInput
post Jan 15 2013, 10:42 PM
Post #283


Member
***

Group: Members
Posts: 194
Joined: 3-January 10
Member No.: 5156



Half yearly update of the Mars Rover Exploration Rover timeline.
Attached thumbnail(s)
Attached Image
 


--------------------
Need more input ...
Go to the top of the page
 
+Quote Post
dilo
post Jan 19 2013, 04:30 PM
Post #284


Senior Member
****

Group: Members
Posts: 2492
Joined: 15-January 05
From: center Italy
Member No.: 150



Attached Image

Complete Odometry update based on MoreInput timeline.


--------------------
I always think before posting! - Marco -
Go to the top of the page
 
+Quote Post
Ant103
post Jan 19 2013, 05:31 PM
Post #285


Senior Member
****

Group: Members
Posts: 1619
Joined: 12-February 06
From: Bergerac - FR
Member No.: 678



Excellent work smile.gif


--------------------
Go to the top of the page
 
+Quote Post

24 Pages V  « < 17 18 19 20 21 > » 
Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 19th March 2024 - 02:14 AM
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and copyright.

OPINIONS AND MODERATION
Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators.
SUPPORT THE FORUM
Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member.