"Flight Stability of Rigid Wing Airborne Wind Energy Systems"

[PierreB]

Thanks for the precisions @rschmehl.

@rschmehl

If there are connected by more or less rigid elements, they form, in my understanding a rotor.

There is no rigid elements on the rotary kite system on the photo below or on some versions of RotoKite.

And also a crosswind kite flying in a circular path (e.g. Makani wing) can be seen as a blade of a rotary system where the center of the flight path is the (also more or less because of disturbances) stationary axis, said blade-wing being the “best and lighter tip part” of the blade of a wind turbine, as often represented.