Electric ducted fan propulsor

An aircraft comprising a fuselage and wings;

• the aircraft comprising at least two electric ducted fan propulsion systems;
• each electric fan propulsion system comprising:
• a two stage contra-rotating fan system comprising an aerodynamic duct surrounding contra-rotating fan stages providing contra-rotating fans to generate thrust, the aerodynamic duct defining an internal annular volume between inner and outer walls of the aerodynamic duct;
• the internal annular volume housing a power train within the internal annular volume,
• in which:
• the two stage contra-rotating fan system comprises
• a rim-driven motor system to drive the contra-rotating fans;
• the rim-driven motor system comprising:
• a pair of rings that form outer tips of the contra-rotating fans;
• each ring bearing embedded rotors for cooperating with respective stators located within the internal annular volume of the aerodynamic duct;
• the pair of rings and the embedded rotors both being housed within the internal annular volume of the aerodynamic duct;
• the power train comprises energy storage, electric motor drive and inverter, engine control unit, power distribution unit, and thermal management system.

A thermal management system for an electric ducted fan propulsion system comprising a power train disposed within an internal annular volume of a nacelle;

• the power train comprising at least:
• energy storage, electric motor drive, an inverter and the thermal management system;
• the thermal management system comprising:
• a dielectric liquid cooling circuit for circulating a dielectric cooling liquid;
• the dielectric cooling liquid being in thermal communication with at least one or more than one of:
• the energy storage, the electric motor drive and the inverter.