Experimental Study on Seakeeping Performance of a Catamaran with Asymmetric Demi-Hulls

To capture the seakeeping performance of a catamaran with asymmetric demi-hulls, tank tests were carried out in regular head waves using a scaled model with 2.036 m in length. the lateral space between the demi-hulls was changed in the tests as w/b=2.55, 2.90 and 3.25, where w denotes breadth overall and b the breadth of the demi-hull. also, two models with different water lines of inside flat and outside round (if-type) and of outside flat and inside round (of-type) were used. of-type is superior to if-type in both ship motion and added resistance performances in waves at the design speed. in if-type series, the smallest clearance, w/b=2.55 is the best in the added resistance performance.