Variants with universal joints, double universal joints, bevel gears has been discussed.
I think we have to keep it simple. All these variants, comprising pulley system, lead to additional weight and frictions. Certainly there are some (limited for a low angle) losses for SuperTurbine ™ but also some lift, and it is simpler and lighter.
And also an option for multi-rotor on a tether (instead of a bar) can be studied in yo-yo mode.