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The IMPASS robot will use rimless wheels with spokes that can lengthen or shorten according to terrain. IMPASS, which stands for Intelligent Mobility Platform with Active Spoke System, is under development at Virginia Polytechnic Institute and State University.
According to one of the developers, engineer Dennis Hong, the spoke wheel concept "allows multiple modes of motion, which give it the ability to stride quickly using one contact point per wheel, walk with static stability with two contact points per wheel, or assume a stable stance using three contact points per wheel."
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