Sorry for the couple months off the radar. It was super hard but we managed to make our system rotate stably with neither a lifter nor active control surfaces. Funnily enough, the system gets more and more stable the longer the tethers are (up to a point).
You might notice that the base is now powering the rotation. This change was to avoid breaking too many motors, because there were a lot of crashes before we managed to build the wings correctly. We probably will come back to self-propelled wings at some point.
Feel free to comment on the post if you want a quick reply, I don’t always check this forum.