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but the ability to overcome stresses is always partly based on design, partly on materials, and partly on scale. Scale changes stresses faster than design and materials can compensate, of course, which is what limits the propellor-style turbines as well. Interestingly, however, a spade design for a vertical turbine might well compensate for a gradient based on altitude. What do you think?

paul spencer
by paul spencer (spencerinthegorge AT yahoo DOT com) on Tue Nov 27th, 2007 at 11:48:55 AM EST
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