Date: February 28th 2008

Feb 27, 2008

Stephanie Schierholz Headquarters, Washington 202-358-4997/2087 stephanie schierholz@nasa gov

Brandi Dean Johnson Space Center, Houston 281-244-1403 brandi k dean@nasa gov

RELEASE: 08-068

NASA'S NEWEST CONCEPT VEHICLE TAKES OFF-ROADING OUT OF THIS WORLD

HOUSTON - In a car commercial, it would sound odd: active suspension, six-wheel drive with independent steering for each wheel, no doors, no windows, no seats and the only color available is gold

But NASA's latest concept vehicle is meant to go way off-road, as in 240,000 miles from the nearest pavement, and drive on the moon NASA is working to send astronauts to the moon by 2020 to set up a lunar outpost, where they will do scientific research and prepare for journeys to more distant destinations

Built at NASA's Johnson Space Center, Houston, the new design is one concept for a future lunar truck The vehicle provides an idea of what the transportation possibilities may be when astronauts start exploring the moon Other than a few basic requirements, the primary instruction given to the designers was to throw away assumptions made on NASA's previous rovers and come up with new ideas

"To be honest with you, it was scary when we started," said Lucien Junkin, a Johnson robotics engineer and the design lead for the prototype rover "They tasked us last October to build the next generation rover and challenge the conventional wisdom The idea is that, in the future, NASA can put this side-by-side with alternate designs and start to pick their features "

One of the first standards to go was the traditional expectation that a vehicle should have four wheels Mars rovers Spirit and Opportunity, still cruising around the Red Planet, have already proved the value of a couple of extra wheels When one of the six wheels became inoperable, the rovers had no problem rolling on using the remaining five

With the number of wheels decided, the next question was how those wheels should turn On a car, the front wheels turn a few inches in either direction, and both wheels point in the same direction On this rover, all six wheels can pivot individually in any direction, regardless of where any other wheel points To parallel park, a driver could pull up next to the parking place, turn all the wheels to the right and slide right in

Of course, astronauts will not have trouble finding a parking space on the moon But the feature, called crab steering, has advantages for a vehicle designed to drive into the craters of the moon If a slope is too steep to drive down safely, the vehicle could drive sideways instead - no backing up or three-point turns required The all-wheels, all-ways steering also could come in handy when unloading and docking payloads or plugging into a habitat for recharging

Introducing crab steering drove the concept in several other ways If the rover's wheels turn to drive in a different direction, the driver needs to be able to do the same The driver stands at the steering mechanism because sitting in a spacesuit is not comfortable or practical The astronaut's perch - steering mechanism, driver and all - can pivot 360 degrees

"The Apollo astronauts couldn't back up at all because they couldn't see where they were going in reverse," said Rob Ambrose, assistant chief of the Automation, Robotics and Simulation Division at Johnson "If you have a payload on the back or are plugging into something, it could be really important to keep your eyes directly on it "

The vehicle also can be the ultimate low-rider It can lower its belly to the ground, making it easier for astronauts in spacesuits to climb on and off Individual wheels or sections can be raised and lowered to keep the vehicle level when driving on uneven ground

Some, all or none of these features may be selected for the design of a rover that eventually goes to the moon NASA's lunar architects currently envision pressurized rovers that would travel in pairs, with two astronauts in each rover The new prototype vehicle is meant to provide ideas as those future designs are developed

"This rover concept changed the whole paradigm," said Diane Hope, program element manager for NASA's Exploration Technology Development Program at NASA's Langley Research Center in Hampton, Va , which sponsored the vehicle's development "It's not something I would have expected It provides an alternative approach "

To view images of the lunar truck and another rover technology in development, visit:

http://www nasa gov/mission_pages/constellation/main/lunar_truck html

A Video File of the lunar truck will air on NASA Television For schedule and downlink information, visit:

http://www nasa gov/ntv

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