The link that was posted earlier uses energy in the waves working against the tension between the two parts solarwind wrote: >On Fri, Apr 16, 2010 at 7:08 PM, Isaac Marino Bavaresco > wrote: >> There is a swimming pool toy that you hold at some depth and then >> released at a certain angle. It crosses the swimming pool very quickly >> as it floats upwards. In this case, the energy comes from the muscular >> force. >> >> For a self-propelled device, it would be necessary to use batteries to >> pump water out (and perhaps in), charged by solar cells. > >Right. So would that be more efficient than using a water jet or >propeller driven engine? It doesn't need to go very fast, just as >efficiently as possible. >-- >http://www.piclist.com PIC/SX FAQ & list archive >View/change your membership options at >http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist