Mecanum

http://www.odd.org.nz/oddbot.html

http://www.robotshop.com/media/files/images/dfrobotshop-rover-mecanum-wheel-motion.jpg

http://m.instructables.com/id/Mecanum-Wheels/all/ https://www.youtube.com/watch?v=v7CujEW0wgc http://lib.store.yahoo.net/lib/yhst-33833170891817/MecanumWheelSpecSheet.pdf