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Anybody know the design CG for 23ft hull.
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Moesly always put the center of the gas tank on the C/G so trim wouldn't change as you burn off fuel. (Pilots tend to be real fussy about stuff like that!) Not sure if Potter's designs were that sophisticated, but if your fuel tank is in original location, the center of the tank should be pretty close to the C/G.
I have a roller trailer with a rear cross-member supporting a gang of rollers that pivots when CG of boat moves aft of cross member when launching. Although the tension of winch cable on bow eye may affect it slightly, this "pivot point" on my Seafari seems to be pretty close to the center of fuel tank.