Planing is generally when the hull has generated enough lift and is mostly out of the water... which is generally not the case with most multihulls. Which Catamaran do you have??
BTW, citing boats that compete in the Sydney-Hobart race that are over 60' LOA and the Volvo 60's is relatively irrelevant IMHO, since these are mostly pure racing machines, and in most cases far out of the budgets of most sailors. I seriously doubt that anyone cruises on one of these designs, since they are not really designed for comfort to any degree.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.