عباس دشتی منش

Development of marine engines and high strength light weight material lead to achieving very high velocities. Moreover, design of hull forms with low hydrodynamic resistance and optimization of existing designs are always considered by researchers. Stepped planing boats as a special design of high speed craft can lead to increscent of boat speed without any variation in propulsion system or general change in hull form. Step by creating a transverse discontinuity in hull bottom and forming an air cavity causes wetted surface reduction and consequently, resistance reduction. In the current article, by a comprehensive literature study in the field of stepped planing hulls, various characteristics of this hull form are introduced. Physics of fluid flow around the stepped hulls as well as effects of different parameters in resistance reduction are also studied. Obtained results about the seakeeping and maneuvering in the previous researches will also evaluated.