The paper describes the hydrodynamics characterics of a new type of displacement hull called Top.Glider, which overcomes the critical speed of the typical displacement monohull. Simulations results using a 3-dimensional CFD viscous tool are compared with towing tank data and a full scale test model of 14.5 m. The scalability of the new design is analyzed for a range of ship lenghts, and compared with reference displacement and planing hulls. The aim of the study is to show the advantages of the design, like lower fuel consumption, reduction of wave making and radar signature, and increase of on-board space.