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[Phys-l] Wind Powered Vehicle speeds downwind



An object that apparently excites physicists' emotions...a wind yacht that goes downwind at
wind speed X 2+

http://www.wired.com/autopia/2010/06/downwind-faster-than-the-wind/

(Which reminds me - there's a boat that can sail directly upwind - I think THAT one
can go faster than the wind too....)

Brian W