Why Airfoils?

Making the Wind Work for You

You can’t pick up your home or farm and move it to where the winds are better, so the answer for us was to design a generator to make good power with the winds you’ve got. We have done this by using an airfoil to increase the speed of the wind before the turbine, in effect, making all winds faster and more productive for the generator.

Have a look at this air velocity CFD test:

CFD Velocity TestNote that the wind approaching the nose of our  airfoil is at 20 MPH, but after it contacts the airfoil, it accelerates up to 32 MPH at the hump, where the turbine is located. The power available in the wind increases with the cube of wind speed. This means that doubling the wind speed increases the power available by a factor of eight.  Suddenly, there is 8 times more power available in that breeze! But we aren’t done yet…

 

Secondly, the airfoil also creates a pressure differential between the two sides that we use to turn the turbine as well. We take the relative high-pressure area below the airfoil and duct it into the turbine housing where it lessens drag and increases the speed of the rotor. This increase in rotor RPM pulls more air along the top of the airfoil and over the turbine, raising the power available further.

Finally, as the spent wind (that which has already had its energy extracted) exits over the long tail of the airfoil, it is transformed back into a smooth linear flow which increases the air velocity over the turbine for the third time!

For more on this, please click here to enjoy our 2 minute “How it Works” video 

The key factor – wind speeds:  Although all Wind Power Generators need wind to make energy, the difference lies in how much wind they require.  In the case of those very large utility-sized generators, they must be placed at only those sites with consistently high wind speeds to be fiscally viable. Because of their great cost, they must have great production in order to pay for themselves. This restricts them to specific locations like high hills, ridges, and ocean sides. The problem is that locations like that are not often near the typical farm or rural community where the energy is wanted.

The Airfoil Generator is designed to be cost effective in a lower range of wind speeds and small enough to be able to be located where needed.

Have a look at this wind speed chart covering a large section of the American Midwest and note what the most frequent winds are. You can see that a Wind Power Generator that needs wind speeds of 20 MPH and up isn’t going to produce maximum output very often, and that a generator designed to perform in the 5 to 18 MPH range is going to be very productive. That’s us.

Annual Frequency of Wind Speed

Our Planned Roll-out:

We feel the time to act to help reduce emissions on this planet has never been more critical. And we believe that this mid-sized generator can have an impact, but only if it is deployed in enough numbers. This is why we are coming to market in a different way. We won’t be building these airfoil generators ourselves, but instead, we are selling licenses so that they can be built by as many individuals or manufacturers as possible. Natural competition between the manufacturers will lead to better products and lower prices, as well as providing the consumer with multiple purchase options.

Our design is so unique that it has received two patents thus far and has other patents pending. It has also gotten the attention of the National Renewable Energy Lab (NREL), who issued us a technical assistance grant to further the development of our design.

Our niche: If you’re looking at getting a Wind Power Generator for your rural residence or farm, you may have noticed that there is quite a gap between the macro and micro generators, and we are working to fill that void. Computer simulations on our M18 generator design tell us that it will produce about 1 to 4 Kw in the 5 to 18 MPH winds that are most common in non-coastal areas, and a maximum of 7.7 Kw in a 25 MPH wind. This is considered right-sized for rural residential and small farm applications. That is our niche.