In the last decade, planing crafts are used widely in civil and military sector due to their good performance in high speeds. Due to complex behavior of planing vessels, the hydrodynamic analysis of planning vessels is important. Computational Fluid Dynamics (CFD) is an effective and efficient tool for the numerical hydrodynamic analysis of high speed crafts. In the present study, the hydrodynamic performance of a Naples high-speed craft is investigated using CFD and Reynolds-averaged Navier–Stokes equations (RANS). This simulation is three-dimensional, considering free surface effect and turbulent flow. To calculate the resistance and trim, the vessel is considered in two degrees of freedom. In addition to, using the 6-DOF solver and using dynamic mesh, the rigid-body dynamic equations are coupled to the fluid-governing equations. Numerical simulation are performed at Re>3.5×106 for a range of Froude number from 0.52 to 1.65, and then verified by experimental data. Comparison of the numerical and experimental results shows that the average error values for resistance and trim of the vessel are less than 3% and 9%, respectively, which confirm accuracy of RANS method. Wake and wave pattern around the planing hull also analyzed.