The green part of the oval would be (dyneema) line, the filled orange ovals would be blades, the orange lines would be rods (which might be airfoil shaped) connecting the blades to the line. In operation doing torque transfer I imagine that the line would have that oval – or troposkein – , and helical shape. Perhaps it might be a good idea to stagger the blades between the different lines. An alternative might be to have the blades be more of a paddle shape, with the end of the “paddle” handle attached to the lifter line and able to pivot. Easing torque transfer but limiting the maximum width of your helix.
I think perhaps the top of the oval is fixed to the (red) lifter line and the bottom is not. When you then let out the lifter line the oval becomes narrower, when you reel it in it becomes wider.