The Air Diode VAWT (Vertical Axis Wind Turbine)

Now accepting orders for the basic Air Diode VAWT

This model has a 3/4" shaft and coupler and can be used to drive any rotary-operated device.  Water pumps, air compressors, generators, and refrigeration pumps can be turned by the shaft.

An electric or manual clutch may be added if required for your application.  This is an ideal alternative energy source and does not require a large tower due to its efficiency.  However, you must have a clear and unobstructed source of wind for any windmill or wind turbine to be effective.

Sizes Available:

  • 12' - 2kw

  • 6' - 1kw

  • 3' - 500w

Types of Output:

  • Bare Shaft (now)

  • Generator (soon)

  • Water pump "

  • Air compressor "

An effective answer to your power needs


  • All-aluminum construction

  • Very simple assembly

  • Can be mounted nearly anywhere

  • Can carry signage or printed displays

This device is perfect for coastal areas where a constant (or nearly so) wind is available!

Essential note about alternative energy - READ THIS.

How it Came About

A digital rendering of an idealized Air Diode VAWT


    Imagine the vast bulk of moving air that surrounds our planet, and the immense store of energy that it represents.  Wind moves due to the air being heated by the Sun, so realistically, wind power is second-hand solar power but in a form that can be used both day and night.

    The standard windmill design has issues that are sometimes difficult to address, so I have come up with an entirely new way of getting that power into your hands.  Most windmills must aim into the wind to operate.  What if you could have a windmill that is insensitive to wind direction?

    VAWT or Vertical Axis Wind Turbine designs have been around for many years, but they show terrible efficiencies due to a simple problem- when a face is pushed by the wind, another face is coming around directly into the wind, thus creating a great deal of resistance.  This reduces efficiency terribly and leaves most VAWT designs impractical.

    In 1989 while writing a novel, I had an epiphany about moving air and drag.  I envisioned a panel covered with louvers that would allow the air to flow freely in one direction while airflow in the opposite direction would snap the louvers shut, creating an airtight surface to push against.

    This panel of louvers "rectifies" the flow of air in the same way that a check valve or electronic diode does.  Thus I arrived at the name "air diode".  My first physical model was made in cardboard to verify the principle.  My first working model was made of steel fence grid and fabric from horse feed bags.  A YouTube video shows an early operating model here.

    Today's version has aluminum slats as pictured in the rendering.  Real-world tests show that while fabric does work, at high wind speeds it tends to flutter, creating drag and lowering efficiency.


Assembling a 2-kilowatt test model of the Air Diode using flexible louvers.  In some applications a fabric louver can be used.  This can be printed with artwork or banners, thus making the device a means of displaying signage or images.

The Air Diode can be mobile and setup can easily be done in less than ten minutes.  The entire device will fit in the bed of a standard pickup truck.  Fabric model shown.


With my friend Michael Fulton, PhD in New Mexico in January 2007.  There are two 12' helical VAWTs behind us.


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