Instead of using 'subjective' PN numbers, isn't there some mathematical formula, where the weight of the platform is factored with the amount of sail area to give a theoretical target speed?

I'll bet the guys who are designing the foiling AC boats have that formula somewhere, can't we just borrow it, plug in the numbers for the smaller foiling cats, and get some factual potential speed numbers, vs. using subjective, weed clearing, slow taking, good skipper/bad skipper induced numbers?