Just when you thought Mars rovers couldn’t get any cooler,
here comes the ‘tumbleweed rover’. As the name implies, this is a rover that
would travel across the Martian landscape driven solely by wind power. You can
see an artist’s rendition of such a rover below.
Credit: North Carolina State University.
Because conditions on Mars are unlike anything that can be
found on Earth, designing such a rover requires computer models and
simulations. Alexandre Hartl and Andre Mazzoleni of North Carolina State
University created their own simulations of Martian rock fields and wind
patterns to virtually test various
types of rovers.
The researchers compared rovers of different
sizes and weights to determine the optimal design. Not
surprisingly, lightweight rovers with large diameters were able to travel the
furthest in the same amount of time under the same wind conditions. This is
partly because they present a larger surface area to the wind, and partly
because larger rovers can more easily bounce over obstacles.
Perhaps most importantly, larger rovers don’t require as much wind to dislodge
them from behind rock formations or to get them going again once they’ve stalled.
The obvious advantage of using a tumbleweed rover is that it
would not expend any energy traveling from place to place. It could
therefore save all its power for sample collection, data analysis,
communication with Earth and other tasks. In addition, such a rover could
potentially travel great distances from its landing site over a variety of
terrains.
The obvious disadvantage is that the rover might never
happen to reach those regions of greatest interest to areologists. Remember,
there is no way to steer these rovers. Still, the much lower cost of these
lightweight rovers could allow for hordes of the devices to be deployed with
the hope that they would eventually spread across the planet.
By the way, if you pictured these rovers sedately rolling
along, you have the wrong image in your mind. They would most likely spend more time bouncing than rolling.
The two-year-old clip below shows some examples of
tumbleweed rover designs.
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