Calculation Hydrodynamic Characteristics of High Speed Planing Vessel with Variable Deadrise

There are various methods about calculation hydrodynamic characteristics of high speed planing vessels. One of them is Savitsky's semi experimental method. In most methods including Savitsky's semi experimental method, deadrise angle is assumed constant or in the event that it was variable in longitudinal direction hull vessel, using deadrise angle value measured at transverse section in the center of gravity when hydrodynamic characteristics and resistance are evaluated. These assumptions do not match with the real physics of more high speed planing vessels. In this paper to calculation hydrodynamic characteristics of high speed planing vessel with variable deadrise angle, hull vessel divided to prismatic sections with equality length by transverse sections in longitudinal direction hull then to determine trim angle is used nonlinear optimization method to satisfied general equilibrium equation of hull. Finally, is shown good agreement between the calculation trim angle and experimental result.