Abstract: A convertible aircraft comprising a main body integrating at least one substantially triangular wing (1), the main body having a recess (2) centered substantially in correspondence of the center of gravity of the aircraft; and a propulsion system associated to the main body so as to make it selectively pivoting within said recess (2) with respect to the main body, the propulsion system comprising a thrust rotor system (10,11); main motor means (33,9) for operating the thrust rotor system (10,11); and means (31,32) for adjusting the pivoting of the propulsion system with respect to the main body, apt to change the tilt of the thrust developed by the rotor system (10,11); wherein the overall assembly is such that the tilt of the axis of rotation of the rotor system (10,11) is variable in association with said pivoting so that the thrust instantaneously developed thereby is vectorially passing through the center of gravity of the aircraft.