An electrical machine comprising: a stator assembly coupled to an engine stator component of a propulsion engine, the stator assembly comprising: a stator support assembly fixedly attached to the engine stator component; and a stator disposed on a supporting surface of the stator support structure; and the electrical machine also comprises an electrical machine shaft coupled to an end of a shaft of the propulsion engine via an intermediate shaft member extending axially between the end of the shaft and the electrical machine shaft; a bearing support frame extending from the propulsion engine, the bearing support frame defining a bearing cavity in conjunction with the electrical machine shaft; first and second electrical machine bearings (522, 524) radially extending from the bearing support frame to rotatably contact the electrical machine shaft; a sealing member disposed axially aft of the electrical machine bearings, the sealing member extending from the bearing support frame to the electrical machine shaft; and characterised in having: a rotor support structure directly connected to the electrical machine shaft; and a rotor attached to the rotor support structure, wherein the rotor rotates in conjunction with the electrical machine shaft to exchange energy with the shaft of the propulsion engine, wherein entireties of the rotor and the rotor support structure are disposed radially inward of the stator assembly. a stator support assembly fixedly attached to the engine stator component; and a stator disposed on a supporting surface of the stator support structure; and the electrical machine also comprises an electrical machine shaft coupled to an end of a shaft of the propulsion engine via an intermediate shaft member extending axially between the end of the shaft and the electrical machine shaft; a bearing support frame extending from the propulsion engine, the bearing support frame defining a bearing cavity in conjunction with the electrical machine shaft; first and second electrical machine bearings (522, 524) radially extending from the bearing support frame to rotatably contact the electrical machine shaft; a sealing member disposed axially aft of the electrical machine bearings, the sealing member extending from the bearing support frame to the electrical machine shaft; and characterised in having: a rotor support structure directly connected to the electrical machine shaft; and a rotor attached to the rotor support structure, wherein the rotor rotates in conjunction with the electrical machine shaft to exchange energy with the shaft of the propulsion engine, wherein entireties of the rotor and the rotor support structure are disposed radially inward of the stator assembly. an electrical machine shaft coupled to an end of a shaft of the propulsion engine via an intermediate shaft member extending axially between the end of the shaft and the electrical machine shaft; a bearing support frame extending from the propulsion engine, the bearing support frame defining a bearing cavity in conjunction with the electrical machine shaft; first and second electrical machine bearings (522, 524) radially extending from the bearing support frame to rotatably contact the electrical machine shaft; a sealing member disposed axially aft of the electrical machine bearings, the sealing member extending from the bearing support frame to the electrical machine shaft; and characterised in having: a rotor support structure directly connected to the electrical machine shaft; and a rotor attached to the rotor support structure, wherein the rotor rotates in conjunction with the electrical machine shaft to exchange energy with the shaft of the propulsion engine, wherein entireties of the rotor and the rotor support structure are disposed radially inward of the stator assembly. a rotor support structure directly connected to the electrical machine shaft; and a rotor attached to the rotor support structure, wherein the rotor rotates in conjunction with the electrical machine shaft to exchange energy with the shaft of the propulsion engine, wherein entireties of the rotor and the rotor support structure are disposed radially inward of the stator assembly.