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Tom Potts wrote: > How about vertical blades on a conveyor belt for wind power. Simple fabric and > wire blades will feather as the wind increases - and as they're not radial > you can reduce the inherent inefficiencies of a propellor. Vertical axis wind turbines already exist. Have done for years. Have a google for Savonius or Darrieus wind turbine. AFAIR they're not considered particularly efficient and are more difficult to get to work well than a standard "propeller" turbine. If you want to know more, Gipe's "Wind Energy Basics" is helpful. James -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html