My friend David Matos de Matos who is of Portuguese descent living in Angola, has described a possible way to reverse entropy using hydraulics (see Thermoenergetics: Can Hydraulics Reverse Entropy? on this blog). David has now come up with a simple idea of making use of gravity and a pendulum, together with hydraulics, to produce a useful pumping function.

David's pendulum hydro pump concept is simple and can be built by everyone. It is based on the idea of Milkovich, who says that a suitably heavy pendulum can produce more power than is necessary to expend in order to keep it swinging. The basic idea is described in PESWiki:

Milkovic Two-Stage Mechanical Oscillator

Here is what David says about his invention:

"I [have] just come up with the pendulum hydro pump.

Similar to Milkovic´s device it may be an over unity machine.

I tried with a rudimentary setup in springs, with a rigid rod firmly tied to the bearing. The swing of the pendulum was steady. Looked like the force on the springs where the same on both legs. I did not find any vibrations on the pendulum and the amplitude behaved like the schematic showed on the website.

The pendulum keeps swinging, with the pivot making a parabola. It looks like, if we extend an imaginary line from the rod up, it will have an imaginary fixed pivot.

I am setting up everything for a prototype. Let´s see how it goes.

I am inviting everybody to build small prototypes because we will have different perspectives and improve it.

I am not filing a patent, and wish that a lot of water pumps being installed in Africa, the most needed good in this continent.