Continuing some investigations, this time with a fixed annular ring of Sharps rotors, again to provide lift and ensure some rigidity.
The two following sketches represent AWES whose the external part is the said ring, and could perhaps lead to denser farms of AWES, in some way in AWES farm in bumper car mode where collisions would have minor consequences due to the fixity of the external part. And also the tethers arranged in circular way prevent tangles between unities.
A turbine sustained by cables (Altaeros way) within the ring:
Two counter-rotating rotors which also act as spokes to increase the rigidity of the ring:
An inner rotor + an external rotor in such a way that each rotor sweeps its own area, the bumper car mode being not possible because of the external rotor:
The last is an example of an AWES with more potential of power by area, but a lesser Power to space use ratio because of the requirement of more spacing between unities within a farm.