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This is my first robot, I started with a boat made out of isolation foam, witch floats really well! The 'Brain' is a Picaxe 28x1 project board and I got the motor + propeller from a broken RC plane. The rudder is simply a cut piece of metal sheet and it has 8 AA batteries.
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/foamboat