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Girls call me Makaluod
What you should be thinking of is a thing called metacritic height of a ship. Basically, the larger the metacritic height, the stiffer the ship's stability is.I can’t get on something in the water looking that top heavy since I saw “The Poseidon Adventure”.
The minimum allowable metacritic height of a commercial ship is 600mm. Most ships have a metacritic height that is much greater. Passenger ships try for the lowest metacritic height. The reason for this is that the lower the metacritic height, the slower and longer is the ship's roll period. A sharp short roll period is more conducive to seasickness in those not use to a ship's motion, hence the low metacritic height for passenger ships.
Catamarans, by their very nature, have a very high metacritic height. It is for this reason that passengers on catamarans, contrary to popular belief, are actually much more susceptible to seasickness.