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Over the past years, the utilization of unmanned aerial vehicles (UAVs) has drastically increased for a wide range of applications. In particular, small fixed-wing UAVs, with wing spans of a few meters have been developed for a multitude of autonomous air-borne tasks. Today, the operation envelope of these UAVs is significantly limited by atmospheric icing. Due to a lack of effective icing protections systems, UAVs are usually grounded when icing conditions are expected. The objective of this work is to increase the understanding of the effects of icing on UAV aerodynamic performance by comparing two numerical methods. Atmospheric in-cloud icing affects all types of airborne vehicles and has therefore been in the focus of research for several decades aimed at commercial and military aircrafts. Hence today, there is a well-established understanding of iced-airfoil aerodynamics for subsonic aviation [1]. However …