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The one thing I do not see in your explanation is about those short waterlines. On the CCA boats, their waterlines lengthen with heeling (easily equaling conventional short-overhang boats' waterlines), so as they roll, their lengthening waterlines would tend to decrease, not increase, harshness, and when heeling, impose gradual, increasing resistance to the roll angles. Basically opposite of what you are saying.
On your example of having a 500lb weight on the mast, high above the boat, technically speaking, the capsize ratio and motion comfort scales are correct. Why? The added weight at the high end of that mast requires greater energy to induce roll. Thus, the boat is slower to respond to external force, meaning, it has a gentler motion and greater initial resistance to roll and capsize. The extra 500lbs has a greater inertia that must be overcome to induce roll motion, or, for that matter motion fore/aft. Then, the reversal of the roll is also gentler, as that inertia has to be overcome again to right the boat. The slower response makes the boat gentler, and more resistant to capsize from wave influence. It will heel over longer, and recover more slowly, i.e., more gently. The term "wallow" comes to mind if weight aloft is too great. As stated, practicality must be factored in. In a sterile lab, this would seem to be an ideal solution, but in reality, this can be taken only so far, because if taken to extremes, the boat would be easily rolled if the weight was too great. Weight aloft must be considered with all other factors. Again, opposite of what you are saying. Glass half full/half empty. We're never gonna agree on this.
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