Numerical Modeling of a Planing Hull Maneuvering in a Regular Wave, Part 2: Safety Operation

In Part 1, we studied the instability of the high-speed surf rescue boats (SRB) when operating in two-dimensional incident waves, and used existing information to benchmark the DiSSEL ship motion model simulations. The pressure distribution on the bottom is a contributor to boat motions. To reduce the pressure on the bottom, we can simply increase the deadrise angle. This can change the roll and pitch response. However, increasing the deadrise angle may impact the ability of high-speed craft to get on plane. By varying deadrise angle, it is possible to select a compromise deadrise angle that improves motion performance without significantly degrading its ability to get on plane. In this study, we will use DiSSEL to choose the best deadrise angle, which will allow the high-speed planing craft (SRB) to operate safely and still be able to get on plane in twodimensional incident waves.