Model-based methodology for upgrading UAV systems: Application to the renovation of the propulsion and control systems of a fixed-wing UAV. - Rabah Louali; Samir Sakhi; Abed Kebairi; Fethi Medjahdi; Ali Kanache; Abdelkrim Nemra; Samir Bouaziz; Aimen Abdelhak Messaoui (J. Syst. Control. Eng., 2026)