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Hydro Pictures
The sketch above shows a simple screw , but for the actual device , likely it needs to be less twisted
The sketch above shows the narrow cavity to hold the motion flat, and the width of the cavity allows the screw to turn.
As the spring turns, it has a cam action, lifting , pushing in up and down direction , and sliding back and fourth in the other direction
The above sketch shows the action of both the screw and the flat membrane with the screw inside.
The above simplistic drawing shows the way the screw fits within the cavity.
the cam action is plain
Above , it shows an exaggerated motion of a fishes propulsion, or for that matter, a combination of a snake and a fish but on a flat plane.
Torqueing will occur to some extent at higher RPMs of the screw, but a little experimentation should iron out that annoyance, you will quickly discover that the motion imparted is greater than calculated and low RPM is better
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