This thesis work aims to model a recreational boat equipped with a hybrid propulsion system, composed by an endothermic diesel marine engine and a three-phase synchronous electric motor. The work was carried out at the company C.M.D: spa in the Atella (PZ) site which has designed and built this new kind of propulsion and through the “ECO 850 hybrid” hull of the Ecoline Marine shipyard in Sarnico (BG). After an initial explanation on the principles that guide marine propulsion and the kinematic chain that is the basis of the model, we will move on to its description through its components and to the description of the driving cycle used.