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Hello, the twin Stepper belt drive was the test rig I used to design the MkII, it had active Pitch control and an RPM sensor and things to help gather data to refine the design.

The belt drive mod can be found here:
https://www.youmagine.com/designs/gt2-main-shaft-pulley-for-mkii-5-watt-3d-printable-wind-turbine

Thanks Dan