Free Spirit: Third Extrication Drive Ends With Wheel Stall

Nov 23, 2009
This blink comparison aids evaluation of a drive by NASA's Mars Exploration Rover Spirit during the rover's 2,092nd Martian day, or sol (Nov. 21, 2009).

(PhysOrg.com) -- Spirit experienced a wheel stall with the right-rear wheel during the second step of a two-step drive on Sol 2092 (Saturday, Nov. 21). This is not the same wheel that stalled on Sol 1899 (May 6), the left-middle wheel.

On Sol 2092, the right-rear wheel did not experience a hard stall like what was seen on Sol 1899. Instead, it stalled because the wheel's progress fell behind the expected rotation rate. The rover had completed about 4 meters (13 feet) of commanded wheel spin before the stall terminated the drive. The center of the rover moved about 4 millimeters (0.2 inch) forward, 3 millimeters (0.1 inch) to the left and about 3 millimeters (0.1 inch) down. The rover suspension stayed within the tighter limits set for the drive, and there was only a fractional change in rover tilt.

The plan ahead for today, Nov. 23, is to sequence a set of diagnostics to explore the right rear wheel stall. The diagnostics will include a resistance test, a possible steering test, a small backward rotation of just the right-rear and a short (about 1 meter, or 3 feet) forward commanded motion of the rover. Resumption of the extrication would be no sooner than Wednesday.

Provided by JPL/NASA (news : web)

Explore further: Scientists find meteoritic evidence of Mars water reservoir

add to favorites email to friend print save as pdf

Related Stories

Opportunity Begins Careful Rollout

May 16, 2005

Opportunity rotated its wheels on sol 463 for the first time since the rover dug itself into a sand dune more than two weeks earlier. The wheels made about two and a half rotations, as commanded, and the results ...

Second Planned Extrication Drive is Straight Ahead Again

Nov 19, 2009

(PhysOrg.com) -- Because the first extrication drive for Spirit, on Sol 2088 (Nov. 17), stopped as soon as it began due to an exceeded tilt limit, the plan for an extrication drive on Sol 2090 (Nov. 19) wil ...

Spirit Completes Fourth Mile On Mars

Feb 14, 2006

Spirit is healthy and continues to make progress toward "Home Plate" after driving more than 150 meters (492 feet), taking images, making atmospheric observations, and analyzing geology.

Opportunity Backs Out Of Potentially Sticky Situation

Oct 12, 2005

Opportunity is healthy and traveling westward around "Erebus Crater." The rover is running in restricted sols, so the team is able to drive it only every other sol and has been doing so. On sol 601, Opportunity drove 34 meters ...

Spirit Wiggles Into A Sturdy Workspace

Oct 19, 2005

Spirit is healthy and spent the week examining a rock called "Hillary" at the true summit of "Husband Hill." The first attempt to approach Hillary ended with a small pebble under Spirit's left front wheel, and the stability ...

Spirit Nears Home Plate

Feb 07, 2006

Spirit continues to make progress toward "Home Plate," a conspicuous circular feature scientists hope to investigate before the Martian winter, in search of layered rock outcrops that may provide additional information about ...

Recommended for you

SDO captures images of two mid-level flares

7 hours ago

The sun emitted a mid-level flare on Dec. 18, 2014, at 4:58 p.m. EST. NASA's Solar Dynamics Observatory, which watches the sun constantly, captured an image of the event. Solar flares are powerful bursts ...

Why is Venus so horrible?

14 hours ago

Venus sucks. Seriously, it's the worst. The global temperature is as hot as an oven, the atmospheric pressure is 90 times Earth, and it rains sulfuric acid. Every part of the surface of Venus would kill you ...

Image: Christmas wrapping the Sentinel-3A antenna

17 hours ago

The moment a team of technicians, gowned like hospital surgeons, wraps the Sentinel-3A radar altimeter in multilayer insulation to protect it from the temperature extremes found in Earth orbit.

Video: Flying over Becquerel

17 hours ago

This latest release from the camera on ESA's Mars Express is a simulated flight over the Becquerel crater, showing large-scale deposits of sedimentary material.

Spinning up a dust devil on Mars

18 hours ago

Spinning up a dust devil in the thin air of Mars requires a stronger updraft than is needed to create a similar vortex on Earth, according to research at The University of Alabama in Huntsville (UAH).

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.