If you consider a conical toroidal band made of string & sheet framework, which inflates and lifts clockwise when held and driving clockwise .... It can be held aloft at points by hollow truncated cone funnel buckets. 
If the funnels were periodically set under an arch, (more open to anticlockwise side) and a band of the sheet and string framework threaded through them... A simple pulley / mesh gear could extract spun band energy.

lofted pulleys ... probably better than Teflon bucket inners... don't know.

guess I need to draw that

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