The introduction of fuel cell systems in new power generation systems in the aeronautical field brings with it the need to increase the power density of these systems. To address the resulting increased criticality of thermal management, it is necessary to consider the correct cooling method, without it excessively affecting the net useful electrical power generated. Furthermore, since large amounts of heat must be dissipated, if this is correctly managed with a suitable radiator and an adequate air duct, the extracted heat can be exploited to generate additional thrust and thus compensate for part of the aerodynamic drag caused by the radiator itself.