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This is one of the robots I am building for this year's NRC. I'm trying an atypical wheel setup for this robot, which could be fast and maneuverable, or could result in an unstable robot with little grip; we'll see! You can find the contest manual for the specific challenge here: http://www.nationalroboticschallenge.org/joomla/index.php/downloads
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/heavyweight-sumo