Hi, Dec2004 Eureka magazine has an article about underwater thrusters. The propellor has a ring attached with magnets and is sealed. On the outside is a set of coils. In the center is just a bearing. TSL Technology. They have a 50mm and 70mm unit available and 300mm in design. It seems likely this would make a good brushless generator. Tested to 750m. The beauty of this design is that there are no seals or shafts. I think miniature air fans have been available like this for a while, but the power is a few watts only. They are designed as motors for 28V. It doesn't say how many phases. www.eurekamagazine.co.uk click reference library motors in the search box. I wonder if you could make a turbine with magnets to fit inside an old induction motor stator? Integrating the turbine and generator seems an obvious step which nobody seems to be doing. Duncan Irvine. ------------------------ Yahoo! Groups Sponsor --------------------~--> What would our lives be like without music, dance, and theater? Donate or volunteer in the arts today at Network for Good! http://us.click.yahoo.com/TzSHvD/SOnJAA/79vVAA/FGYolB/TM --------------------------------------------------------------------~-> Does your company feature in the microhydro business directory at http://microhydropower.net/directory ? If not, please register free of charge and be exposed to the microhydro community world wide! NOTE: The advertisements in this email are added by Yahoogroups who provides us with free email group services. The microhydro-group does not endorse products or support the advertisements in any way. More information on micro hydropower at http://microhydropower.net To unsubscribe: send empty message to [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/microhydro/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
