This a small improvement / extraction of a vibrobot: the Bristlebot of the Evil Mad Scientist Laboratories. Now: We have used a toy-board, a powerful motor with excentric-mounted spindle and 9 Volt block battery. All hooked on 4 tooth-brush heads. This actuation behaves similar to a hoovercraft.
For more infos, go an visit: http://eggshell-robo tics.node3000.com
Using physical parts and motors of electronics to generate and determinate new physical sound structures, that are suitable for enhanced robotic engeneering.
http://eggshell-r obotics.node3000.com