As soon as UAVs reach heights where they even fly through clouds, icing becomes a real problem especially in winter. Here at Meteomatics we are not only making it our business to fly through clouds, measuring weather parameters for our customers and our own high-resolution forecast model, but are also constantly working on improving methods to counter icing effects. Only recently our new anti-icing propeller heating prototypes proofed their effectiveness in a cooperation with BAZL at RailTec's Climatic Wind Tunnel in Vienna.