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Date Posted: - Thursday - 02/18/21 - 3:31pm
Author: Michael Harris (S/V Bird)
Subject: Centers of Effort/Resistance

Has anyone looked at the M31/32 center of effort (CoE) in relation to the keel's center of resistance (CoR)? I am reading Wally Ross' book, "Sail Power" and thought I would put some of the concepts to work to better understand S/V Bird, hull #136.

It seems that the CoE of the combined sails is a bit forward the CoR of the keel, especially if you include the effect of the rudder (which moves the CoR sternward). Moreover, going to windward, when the mizzen doesn't do much, the jib/main combine efforts right around the mast, which is quite forward the CoR of the keel.(the loss of the mizzen CoE eliminates its effect to pull the combined CoE sternward where it is better balanced by the CoR).

I have not noticed a great deal of lee helm in the boat, but maybe that's because of the heavy steering gear. Am I missing something? Any thoughts?

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