Vertical Axis Propeller

Was at the U.S. Army Transportation Museum at Ft. Eustis, VA (a very well done and extensive museum that is well worth checking out) and saw many historical marine craft. Never thought about how much the Army has dealt with marine craft and technologies. Landing craft, tugs, etc. all played a huge roll.

Anyway, they had this Vertical Axis Propeller on display. I have seen studies of these in much more recent times, but didn’t know they had been tried and tested back when. Kind of a Z-drive without the Z… I can see some issues with trash getting tangled, maybe, but…



Power from slow moving water

>>> Power from slow moving water

A new technology take on gaining energy from moving water. Being aimed at power generation from rivers and the like, I wonder if there is any future application for power recovery on sail boats and the like. Maybe even something for when you are anchored in a current.

VIVACE is the first known device that could harness energy from most of the water currents around the globe because it works in flows moving slower than 2 knots (about 2 miles per hour.) Most of the Earth’s currents are slower than 3 knots. Turbines and water mills need an average of 5 or 6 knots to operate efficiently.

Michael Bernitsas

Michael Bernitsas, professor in the Department of Naval Architecture and Marine Engineering, stands before a prototype of his VIVACE hydrokinetic energy device.

VIVACE stands for Vortex Induced Vibrations for Aquatic Clean Energy. It doesn’t depend on waves, tides, turbines or dams. It’s a unique hydrokinetic energy system that relies on "vortex induced vibrations."