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PHRF Question
I am as surprised as Jeff H about the performance difference between the two sails. If the 163 does add a knot to your speed on all points of sail compared to the 153, however, it is improving your performance by a good deal more than the 6 seconds per mile hit that your rating is taking. For example, at five knots it takes twelve minutes to cover a mile. At six knots, it takes just ten minutes. Your net "gain", taking the 6 second rating adjustment into account, would be 1 minute and 44 seconds. Well worth the hit.
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