The numerous possibilities should, however, lead to research aimed at optimizing the entire system, potentially resulting in a torus supporting two counter-rotating rotors. The inner rotor would likely develop twice the power thanks to the ducting effect of the torus (measured and presented in this article), thus compensating for the force of the larger outer rotor attached to the torus. Both inner and outer rotors would drive the same central generator whose stator rotates in the opposite direction to the rotor, each rotor driving either the stator or the rotor. A sketch is presented below.
(PDF) Torus surrounding one or more wind turbines. Available from: https://www.researchgate.net/publication/388800040_Torus_surrounding_one_or_more_wind_turbines [accessed Aug 23 2026].
The photo just above represents an axial tether support (like Kiwee) leading to a setup more stable than what’s in the photo in an earlier comment.