Egis/CORE ) writes:

Sorry old buddy but whether the boat has one hull or many the
calculation is the same since the force is the same - the force
necessary to heel the vessel, or to phrase it another way, the force
the vessel exerts in attempting to stay upright. the Righting Moment,
in other words.

why hasn't anyone simply stated Newton's law?
for every force acting on a body at rest there is an equal and opposite force.
whether you measure the acting force or the reacting force they are equal.
in many cases, like the heeling of a boat, it's easier to calcualte the
reacting force that it is to calculate the acting force.
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