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<p id="p1">Nowadays there are a lot of startups about creation of UAVs for civil application. Most of them are based on electric (batteries) or traditional fuel (oil-based) technologies. From other side, requirements of ICAO about reducing environmental impact of civil aviation are pushing aviation companies to develop green technologies. Some of them are based on hydrogen fuel application. Application of hydrogen can reduce the environmental impact of aviation. The aim of this chapter is to analyze possible trends of civil unmanned aircraft application and to evaluate the possibility and efficiency of hydrogen fuel application for such drones. It was demonstrated that the implementation of hydrogen technology in civil drones presents significant challenges that necessitate comprehensive examination. The two technologies, when considered separately, offer a plethora of advantages. However, when combined, they can potentially lead to undesirable outcomes. On the one hand, they can contribute to an improvement in the environmental impact. On the other hand, they possess unique characteristics that interact with one another. It has been demonstrated that the integration of hydrogen fuel can result in an 8% increase in the mass of the drone, which subsequently reduces its overall efficiency.</p>

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