Recover energy from gravity

[rc4]

let a part of top helix outside water, like that the volume is lower so the weight too. With several number of turns, more than one turn can be outside water; And if the helix turn (not move, just turn like worm drive), the position of helix in water is always the same, need to choose the good position for have no torque on helix.

[Gabriele]

You should use an helix like that

[Gabriele]

If the section of the helix is ovoidal,you can use a rectangle containter insted a parallelogram

[Gabriele]

It is clear in this way you have to follow during the fall the rotations of the helix

[Gabriele]

Using an helix like in figure you can mutiply the turns without loosing Fr-Fl