“…These complications contribute to reducing their application in UAVs [27]. Moreover, FCs require: future development [46]; experimental tests [35], [36], [37], [38], [39], [40], [41], [42], [43], [44], [45], [46], [47], [48], [49], [50], [51], [52], [53], [54]; optimization of them in HPSs in terms of performance and mass [53]; and further TABLE 7. Technical specifications of some commercially-available hybrid multi-rotor UAVs.…”