The Jacobs turbines came with two types o governors that act to twist the blade on a shaft parallel to the blade. The one methods uses three "flyballs" that as the speed increase would pull away from a main hub and simultaneously with a lever arm rotate a center gear that mess with partial gears on each of the three blades. This then rotates the blades out of the wind. The second design, that I have on the one I am working on has a large spring from the center of each blade that join together at the front shaft. As the blades flex in high wind they also rotate. The blades are 7 ft long, and the turbine at top speed is 225 RPM, which is relatively slow as small wind turbines go. IN addition to the clear coat I want to paint a red band around each blade, maybe 6 inches in from the end. As the blade spins, looking from a distance, a red circle shoiuld start to appear indicating rotation speed. With the output of the turbine, I will charge a 24 VDC battery bank (originally this is a 32 V system). Back in the day, 32 volt DC was the system of choice. In fact, I have a near new montgomery ward iron and box, a toaster and an electric drill all at 32 VDC. When the batteries are full, most of th time, the excess goes to a dump load, which is essentially heating got air or water. So I am getting heat from the wind, fun concept, and useful here in Wyoming!