This airborne wind energy system (AWES) is a possible variant of the torque-transfer rotating kite turbine of Roderick Read (Winswept & Interesting Ltd) or Douglas Spriggs Selsam. Here the toroidal ballute is a torus inflated with helium (initially) or hydrogen (subsequently) that provides aerostatic lift which supports each of the stacked rotor units (and not just the last one with a lifter kite), thus increasing the number of units and therefore the total range. In addition, the torus can be of large dimensions, which allows for increased scalability and a larger swept area.
Indeed Winflex uses an inflatable torus, but the blades are inside while they are outside for the rotary ballute kite which is a TRPT like Daisy. That said the attachment of the blade around the torus in the Winflex manner can be applied.
I use a torus for several designs. This torus design could be more appliable than some others.
Nevertheless, for a large number of stacked units, the angular rotation speed of each of the rotors should be identical. One risky solution: placing increasingly larger rotors for increasingly stronger winds. Another solution: arranging to capture the angular speed of each rotor to equalize it for all rotors, preferably using methods less complex than variable pitch, possibly by means of telescopic blades or aerodynamic brakes.
A tilted ballute could become a tilted rotary ballute-based kite, by adding blades and TRPT, as it was achieved in a certain way by the initial Daisy design.
