Originally Posted by Jeff_H
I think that you and I are trying to say roughly the same thing. I was saying it in the negative by pointing out that in and of itself, increasing the displacement of a boat does it automatically add to carrying capacity.
You are pointing out in the positive, a heavier boat does not have greater carrying capacity if that added weight is in the form of a heavy hull and deck structure.
In a heavier boat, the percentage of increase in her displacement, by adding a given weight of personal effects and stores, will be less than it would be in a lighter boat, and the heavier designed boat will be floating much closer to her original weight. The percentage of change will be far less in a heavier design.