Recently, interest in battery-powered Unmanned Aircraft Vehicles has grown as potential sustainable aerial transport. Reference is made to several Sustainable Development Goals of the 2030 Agenda thanks to the wide field of application of UAVs, covering health, food security, infrastructure, cities, and human settlements. Among the challenges that the integration of UAVs in the existing aviation airspace has to overcome, noise regulation and public acceptance appear, as the noise signature of propellers could critically penalize their perception in the community. In propeller design optimization, noise reduction typically entails a trade-off with aerodynamic efficiency or thrust generation. Moreover, small size and low flight speed collocate drones in the range of Low Reynolds Number, 10^4 < Re_c <10^5, where conventional airfoils exhibit a critical performance level.