The Swiss Indoor Free Flight Modeling Championships took place in Balsthal on 22.02.2025. Our employee Rolf Steinegger achieved second place with his two best flights (out of a total of six attempts) with a total time of 23 minutes and 55 seconds.

Here is a short movie clip.

F1D is the official FAI class for rubber-tyred free-flight indoor models. The minimum weight of the airframe is 1.4 grams, while the weight of the rubber must be less than 0.4 grams. These models have a wing span of max. 55 cm and a chord of max. 20 cm and fly with variable pitch propeller hubs reaching speeds of less than 1 m/s.

F1D are made from the lightest balsa wood available, PET film (0.5 microns) and some high-tech materials such as boron fiber reinforcements and carbon propeller outlines.