From the '50s, with the introduction of the first semi-planing hull of Nelson, which allowed to navigate with a certain tranquility at speeds higher than those of traditional hulls, and with the subsequent availability of more powerful engines, have been reached a speed equal to Fn greater than 0.6, which defines planing hulls. It was created so a clear distinction between displacement and planing hulls, in relation to the performances. The need to have naval units displacing faster has pushed the ship design to achieve increasingly high performance hulls, also focusing on the use of lightweight materials such as aluminum and more powerful engines, etc., but without substantially changing the traditional forms of hull. The patented hull Monotricat high hydrodynamic efficiency and energy saving represents the overcoming of this distinction between displacement and planing hulls, because, unlike previous solutions, is configured as the first hull that combines the characteristics of displacement and planning hull, since it presents an innovative architecture that could be defined as a hybrid between a monohull and catamaran, navigating on spray self-produced. This presentation will show how the hull Monotricat is the first displacement hull that can navigate at both displacement and planning speeds, with a resistance curve almost straight, maintaining the characteristics of a displacement hull. For these reasons the Monotricat hull is able to ensure: safety, comfort navigation, best seakeeping and maneuverability in restricted waters, stability, reduction of resistance to motion, cost management, regularity on the routes even in adverse weather-sea. These characteristics of the hull have been studied, tested and validated by leading research institutes and universities with more ameliorative results in each subsequent experimentation, reported in the present work, which demonstrated a greater hydrodynamic efficiency compared to conventional hulls tending to 20%.