On Thu, 29 Sep 2011 20:14:03 -0400, Honey Badger
wrote:

The goal is to stabilize a 50' power catamaran at rest in rough seas for
more comfortable fishing and mooring. The anti-roll tanks would
probably add a lot of weight.

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Anti-roll tanks do add weight but they can be emptied out when not
needed.

Most power cats need very little stabilization compared to a round
bottom displacement hull. That is one of their strong points. It is
impossible to eliminate all motion. What the stabilization systems
are good at is damping down the amplitude of the initial roll and
eliminating recurrence of the "roll back" oscillation. Multi hulls
tend to be self damping and usually have very little roll back motion.