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Re: tacking angle
Let me put this another way. The faster you go the more you will 'bear off' when beating to hold a perfect/precise set/trim in accordance to maximized aerodynamics as indicated by perfect flowing tell tales. This effect is very apparent on planing hull sailboats and iceboats when they are 'accelerating' to faster speeds.
Simple trigonometry when applied to dynamic acceleration or increasing speed of the *boat*. The same is true for in increasing wind strength/velocity