The design values of wave - induced bending moments must he first estimated, When the direct structural design method was used for general ship designing, especially for ships beyond mies. In order to do so, designers must well recognize and rationally select the wave data of sailing areas, in which the ship will execute its mission. Then according to the loading conditions and the attainable velocities, with linear or non - linear strip theory and codes, the long - term predictions of wave bending moments ...