A pitching stabilization means has at least one stationary stabilization surface extending in a thickness direction from a bottom face to a top face and in a transverse direction from a leading edge towards a trailing edge. The stabilization surface has at least one slot passing through the thickness of the stabilization surface from the top face to the bottom face. The slot is arranged within the stabilization surface between the leading edge and the trailing edge so as to allow a flow of air coming from a rotor to pass from the top face towards the bottom face.