A circular wing aircraft (10) in the form of a helicopter (12) comprising a fuselage (14) and a circular wing assembly (16). A structure (18) is for mounting the circular wing assembly (16) above the fuselage (14) in a stationary manner. An air impeller unit (20) is rotatively carried within the circular wing assembly (16). A device (22) is for driving the air impeller unit (20) to rotate about a central axis (24) within the circular wing assembly (16), so as to provide lift and flight movement while yaw control is maintained.