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    Re: The mathematics of tacking downwind
    From: Bob Goethe
    Date: 2016 Jul 29, 07:08 -0700

    >I like the scales on your sliderule. Your tan scales ...make it very convienent to use the Bygrave procedure which produces more accurate results with a slide rule than the sine-cosine procedure.<<

    Thanks for your affirmation on this, Gary.  It was your encouragement & help with Bygrave  - along with the contributions of others on this list - that convinced me that if one is going to do sight reduction with a stick-style slide rule , then the Bygrave equations were the most suitable ones to use.  Having come to that conclusion, I attempted to optimize the rule's design for those equations.

    Bob

       
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