But where the traction is stronger, as indicated by Beyond the sea, different flight modes. And moving downwind (for the tether during reel-out phase) is naturally used in yo-yo systems, the kite flying crosswind by figure-eight in the middle of the flight window, so in the more powerful zone.
This is where we see that alternative devices to the yo-yo system lead to structures that are unnecessarily heavy and even less adaptable to the parasitic forces generated by the figure-eight movements of the kite. The yo-yo kite station can pivot during the kite’s movements so that it remains in line with the tension produced by the kite, which a rigid track cannot do.