Me too. A super Crackpot design. Something about a Magnus yo-yo: a balloon rotates in the same favorable direction of rotation during both power reel-out and super (wind speed + balloon speed) power reel-in phases, then both the ground station and the balloon rotate 180° to pursue to benefit from the suitable direction of rotation. The air mass of the balloon allows to benefit from both linear and rotational kinetic energy.
A video of a giant yo-yo:
A sketch of a Magnus balloon yo-yo:
