Possibly not classes as a robot (no NXT or sensors), and not really swimming (no water) but I loved the movement of this design. The wheels are free rolling (ie, no motor directly connected to them) but 1 Powerfunctions motor and a collection of pushrods and gears to create a oddly beautiful and smooth motion.
No point trying to explain it, watch the video!
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Damien Kee
www.damienkee.com
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