Airfoil Generator Results Compared to Similar Sized Generators

Q: How can you compare different generators of different designs to each other?

A: By comparing their swept area. That is the one constant across all wind power generators. All of them are trying to extract energy from the wind, and they each engage with a certain amount of wind to do it.  This is called their “swept area” and is measured in square meters or square feet. So, if we compare generators with similar swept areas, we will be comparing like to like.

Generators with swept areas from 2 to 6 m2 

TypeDiameter of RotorHeight of RotorSwept AreaOutputat Windspeed OfkW per m2
Airfoil
Generator
1.44 m3.66 m5.27 m27.74 kW11.2m/s or 25 MPH1.47*
Double Helix
Savonius
1.4 m2.99 m2.1 m21 kW14.9 m/s or 33.4 MPH0.45
VAWG, savonius1.72 m2.45 m4.2 m21 kW12 m/s or 26.8 MPH0.24

Generators with swept areas from 8 to 15  m2

TypeDiameter of RotorHeight of RotorSwept AreaOutputat Windspeed OfkW per m2
Airfoil Generator TWIN1.44 m X 23.66 m X 210.5 m217.6 kW11.2m/s or 25 MPH1.67*
Savonius
2.45 m4.67 m11.4 m23 kW12 m/s or 26.8 MPH0.26
Double Helix Savonius2.19 m3.96 m8.7 m23 kW15.8 m/s or 35.5 MPH0.34
Darrius H-Rotor5.5 m4.33 m23.8 m210 kW11 m/s or 24.6 MPH0.42
TypeDiameter of RotorHeight of RotorSwept AreaOutputat Windspeed OfkW per m2
HAWG, 3 Blade7 m7 m38.5 m28.9 kW11 m/s or 24.6 MPH0.23
HAWG, 3 Blade9.6 m9.6 m72.4 m215.6 kW11 m/s or 24.6 MPH0.21
HAWG, 3 Blade3.8 m3.8 m11.3 m21.9 kW11 m/s or 24.6 MPH0.17
HAWG, 3 Blade4.3 m4.3 m14.5 m24 kW11 m/s or 24.6 MPH0.28

HAWG = Horizontal Axis Wind Generator  VAWG = Vertical Axis Wind Generator

*Note: On this chart we are comparing computational results of the Airfoil Generator design with actual results of real-world generators. We know that generator output often varies from the virtual world to the real world. That is: when generators get built, they sometimes do not produce as much power as the computer simulations said they would. This is due to the drag of the bearings, inefficiency of the blades, the inverter or electronics, and other variables. That said, even if we sandbag the Airfoil Solution design by 25% or even 50%, these results are still remarkable when compared to others of similar size.