US 12539963 B2 / Feb 3, 2026

Method for controlling a transition of a vertical take-off and landing aircraft from hover flight to cruise flight and vice versa

During the transition of a vertical take-off and landing aircraft from hover flight to cruise flight and vice versa, a method for controlling this transition is configured to push propulsion units of the VTOL aircraft through an unstable flow condition zone within a predetermined time period. Each propulsion unit is mounted to a mounting portion of the aircraft in a movable manner about at least one degree of freedom and comprises a flap serving as a lifting and control surface and at least one engine connected with the flap, and each propulsion unit receives command signals for flap angle and engine speed or speeds so that each propulsion unit generates a thrust force and/or a lift force.