Wind turbines are evolving rapidly to meet the demands of a hungry market.
When most people think of wind turbines, they think of sleek, pinwheel-like structures with three blades atop a tall pole, But they come in all sizes and shapes, sometimes rotating horizontally instead of vertically. Some don’t have traditional blades at all, but foils that look more like a twisted strand of DNA.
Others spin with less aerodynamic blades.
Sometimes on a horizontal axis.
Fans are increasingly being designed for quiet, rooftop mounting.
