Abstract: Predicting the forces acting on a high-speed craft and the characteristic behavior of the vessel is critical, especially during transition. Researchers, over the years, have employed various means to solve this problem but with low precision on the behavior of such vessel at transition. This study, however, employed appropriate theory to simulate the character of high-speed craft as she transits from bow-wetting to full planing. The variations of performance parameters and their characteristic contours were computed using computer-based analytical model. The obtained results and graphs showed clearly the dramatic changes in trend of resistance variables, trim and Reynolds’ number, particularly during transition. These generated results compared with those obtained by model tests and numerical simulations were found to be in good agreement. Finally, it established that during the short period of transitions all hydrodynamic performance variables altered characteristically to depict the transition phase before regaining their normal contours.