Electric propulsion mechanisms for air vehicles; Electric propulsion mechanisms for water vehicles; Propulsion mechanisms, other than for land vehicles; Compressing fans; Electric fans (cooling) being parts of machines; Electric fans (cooling) being parts of motors; Fans for engines; Fans for motors and engines; Motorised fans for machines; Air ducting for jet engines; Aircraft engines; Electric drives for aircraft; Electric motors for aircraft; Engines for use in powering aircraft