Magnus effect tidal generators?

Ocean currents can power the world, say scientists – Telegraph

The new device, which has been inspired by the way fish swim, consists of a system of cylinders positioned horizontal to the water flow and attached to springs.

As water flows past, the cylinder creates vortices, which push and pull the cylinder up and down. The mechanical energy in the vibrations is then converted into electricity.

Cylinders arranged over a cubic metre of the sea or river bed in a flow of three knots can produce 51 watts. This is more efficient than similar-sized turbines or wave generators, and the amount of power produced can increase sharply if the flow is faster or if more cylinders are added.

OK, not quite magnus effect, because the water is doing the spinning. Definitely cool if true; I wonder if the scale is such that you could build one for your bathtub…

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