The demand of a new sustainable on-demand urban air transportation system moved the aerospace industry towards new and groundbreaking concepts of electrical VTOL vehicles. Various challenges are related to such type of vehicle, fromavionic and flight controls to the determination of efficient propulsive systems and their integration in the airframe. In particular, in many of these concepts a high number of propellers is present in such configurations where interactions within each other might represent a cause of concerns. This thesis work aims to understands the fundamental effects of the interaction between propellers in overlapping configuration, which is when the two propellers are placed one after another.