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→Active Stabilizers
=== Active Stabilizers ===
Active stabilizers are another type of roll-damping fin. They have electric or hydraulic motors so that their angle of attack in the water can be adjusted dynamically, a little bit like wing flaps on an airplane. Electro-mechanical sensors and a control system make automatic adjustments to the fins. Actuators can be electric or hydraulic. The plates on the hull must be strengthened where the stabilizers are attached. They should be located close to the pivot point of the hull, typically just aft of the maximum beam. As mentioned before, active stabilizers are more effective on a round bilge hull than on a hard chine hull. They should be located close to the pivot point of the hullAlthough they can dampen rolling motions more than 80%, typically just aft of the maximum beamthey do not increase stability. Unfortunately, they are not considered workable at speeds below 8 knots.<ref>http://www.brayyachtdesign.bc.ca/Stability.pdf</ref>
=== Ballast Stabilizers ===
Ballast stabilizers were once common only on large cruise ships but have begun appearing in European yachts and a few large trawlers like Cape Horn. A ballast stabilizer consists of two interconnected water tanks, one on either side of the centreline. As the boat heels a pump transfers water rapidly between tanks to counterbalance the rolling motion. A variation on this theme is to use sliding weights.
