effect of aspect ratio on porpoising occurence

Man is always looking for ways to do his daily work at a higher speed. The ability to move individuals and objects in the shortest possible time has always been one of the main concerns of humans. The marine industry is not an exception to this requirement. The use of planing boats to increase displacement speed as well as agility has received a lot of attention from industries that have not been excluded. The design and construction of these vessels requires dynamic understanding and control of their instability. One of the most important instabilities in planing boats is porpoising under the influence of various factors. In this paper, we investigate the effect of aspect ratio on the stability of planing boats by studying prismatic body. First, the numerical parameters were selected using numerical analysis results on three models with different ratio and then the effect of the aspect ratio on the occurrence of porpoising was investigated using Mr. Suitsky's regression equation.