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Old 10-03-2012
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Re: Full or fin keel?

Ted Brewer's Motion Comfort Ratio might be germane:
MCR = Disp / (2/3*((7/10 * LWL)+(1/3 *LOA))*Beam4/3 )

Now for me that's a little too much math so I go here The roll acceleration: What´s the best for crossing oceans? - Boat Design Forums
and look up a boat. Unfortunately mine is not listed.

Note the formula does not take in keel shape at all - a surprising lack considering the effect of lift and weight, moment arms and all that other 'stuff' that has kept this thread growing.
Of course it also shows Brewer designs as being seriously comfortable.

I also can't see where LOA comes in - my bow spit adds nothing to comfort - that should be LO deck.
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