AN EXPERIMENTAL STUDY ON ROLL DAMPING OF A CAR FERRY WITH TWIN-SKEG HULL

The roll damping characteristics of a car ferry with split-stern hull (twin skeg hull) are experimentally investigated. The experimental results show that the roll damping is increased by the twin skeg at zero forward speed and at high speed. The increase at zero forward speed is caused by the generation of large eddies at the twin skegs, and that at high speed is caused by the lift force increase due to the skegs. The bilge keel component of the roll damping, however, decreases at high speed.