Anton and Inman [8] presented a remote control aircraft is embedded with solar panels and piezoelectric patches for a study of energy harvesting during flight operation. It was found that the energy harvesting systems were able to support the main electrical power sources of the aircraft (piezoelectric patches charged up to 70% capacity of 4.6 mJ internal capacitor). In line with this study, the design and experimental test of a self-charging wing spar for UAV were performed by [9,10]. The self-charging wing spar comprised of piezoelectric layers to harvest the energy generated
via base excitation vibration and thin-film batteries as the energy storage.