Planing vessels have special importance in military industries. The main and most important issue in the design of these types of vessels is a high speed and low body resistance. Therefore, designers make changes in simple body design to
achieve this goal. One of the most important changes that were applied to the bodies of planing vessels was the creation of a chine for the hull. Chine in planing hulls reduces the resistance of the body by spraying water on the surface of the body. Also, due to the ease of creating it in the process of building a hull, chine has become one of the main characteristics of planing hulls. In the field of investigating the effects of chine in planing hulls, there is no complete reference for this topic,
and in various references, only the reason for the presence of chine in planing hulls has been examined. In this research, an attempt is made to analyze the effect of chine on planing hulls by numerical analysis, and after analyzing the results,
optimal chines in terms of the hydrodynamic performance of the hull (the stability of the pitch and heave of the hull and the resistance and lift) to be specified in terms of the design of planing hulls. The method used to analyze the flow around the
considered planing hull is numerical simulation. Due to the reduction of laboratory costs and time, this method, which is the focus of experts, has a special place in the design and hydrodynamic analysis stages and can provide a correct understanding of fluid phenomena in vessel operating mode. In this method, the resistance force of the body, lift force, angle of pitch, and the amount of heave of the intended hulls have been calculated. After verifying the results of the numerical simulations made for the planing hull C in comparison with the laboratory results, the numerical simulations of the planing hulls CH1, CH2, CH3, and CH4 and comparing them with the hydrodynamic behavior of the planing hull C done. According to the results obtained from the