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I prefer Terry Tao's explanation (http://terrytao.wordpress.com/2009/03/23/sailing-into-the-wind-or-faster-than-the-wind/ http://terrytao.wordpress.com/2009/03/

I prefer Terry Tao's explanation (http://terrytao.wordpress.com/2009/03/23/sailing-into-the-wind-or-faster-than-the-wind/ http://terrytao.wordpress.com/2009/03/23/sailing-into-the-wi...), carry the result over to land by replacing the "keel" with gears.

Jun8 16y ago
As always, Tao's explanation is crystal clear, takes you from the absolute basic layman level to as deep as you want to go.