The use of hydrogen in unmanned aerial vehicles (UAVs) has emerged as an effective solution to the problems encountered in traditional battery-powered UAVs, offering advantages such as increased flight times, low or zero environmental impact, and silent operation. This study addresses key points in the design process of hydrogen-based UAVs, focusing on the differences in fuel cell technologies and the effects of hydrogen storage types. In this study, proton exchange membrane (PEM) fuel cells, one of the most preferred technologies in the literature due to their advantages like its low operating temperature, short start-up time, and high power-to-weight ratio, are primarily referenced.