"In contrast to many other legged robots, this one doesn’t use…

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"In contrast to many other legged robots, this one doesn’t use sensors and a computer to help balance itself. Instead, its mechanical design provides dynamic stability as it runs. “All the intelligence is in the physical design of the robot itself,” says Jerry Pratt, a senior research scientist at IHMC who leads the team that developed the robot. Pratt's group at IHMC is working on a range of different robots.
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The Planar Elliptical Runner has a single motor that drives the legs, and the elliptical motion of its legs together with its body shape provide inherent stability. The robot runs at 10 miles per hour, but if it were the size of a human it would travel at 20 to 30 miles an hour, the researchers say."