Abstract
By introducing the unconventional hull forms, we can expect to improve the hull performance of fishing vessels. In this report, we choose the multi-hulls and the hull form above the L. W. L. (Load Water Line) as unconventional hull forms and present several examples and our studies. Generally, the multi-hulls have advantages of the wide deck area and the large transverse stability. In this type of ships, the wave interaction between the hulls induces a serious influence upon the hull strength. Therefore, the knowledge of wave loads taking account of wave interaction is necessary for ship design. Then, we present the results by a new 2-D pressure calculation method of multi-hulls applied to the strip method. For the fishing vessels, the propulsive performance in the actual seas is very important. For this reason, we should study how to improve the hull form above the L. W. L. in the ocean waves. Because the hull form above the L. W. L. is not restricted by the propulsive performance in the calm water. As a first step, we present here the total wave drug equation taking account of the difference of the hull form above the L. W. L. for a ship sailing in a finite regular head wave.
