A large diameter ring style generator?

[PierreB]

I will put here some discussions concerning (at least partially) rim driven ring generators as they are related also to the present topic for what I think.
https://forum.awesystems.info/t/state-of-awes-your-opinions/1531/13?u=pierreb
https://forum.awesystems.info/t/state-of-awes-your-opinions/1531/22?u=pierreb

Solidity and blade number effects on rotor performance of horizontal-axis wind turbines

Keuka Energy LLC (https://keukaenergy.com/) develops high solidity wind turbines rotating at low speed while the expected CP is relatively high. At the opposite a two-bladed rotor like that of MTOsport autogyro (figure 1 and table 2) has a low solidity of 3 %. The thrust is used, as for an AWES using it: For an AWES both options can lead to some advantages. A low solidity autogyro rotor can be suitable when the thrust is used as for yo-yo systems, allowing both lightness and lifetime.

The following link does not represent really a rim driven system but only an inflatable rotor for a HAWT. Perhaps Tensairity ™ could be used for the ring as suggested by @philip.

Inflatable Wind Turbines Pass Laugh Test

A main question could be if Tensairity ™ use can allow to build lighter rotors, being able to scale more, not particularly for Daisy, but rather for rim driven generator systems or only inflatable rotors. Some HAWT, AWES, and also AWE / HAWT hybrid systems could be concerned such like ASWES.