One of the most important challenges of our century is ensuring, as engineers, the design of the most sustainable machines guaranteeing anyway the right amount of performances. A clear example of this theme comes from the aeronautical field where it is possible to observe the will to push for an increase of weight reduction and aerodynamic efficiency, which lead to energy savings and performance increment. An effort in this sense has been made for what concerns the engine design in an open rotor configuration. An example of this trend is found in the increase of adoptions of the propfan engine. In fact, this architecture can be more efficient from the aerodynamic and thermodynamic point of view.