Windspire vertical axis
Here's a closer look at the Windspire vertical axis turbine from Windspire Energy, with the Leonard Zakim Bunker Hill Bridge in the background. The product first came out last year, and the manufacturer was willing to donate one of its first turbines to the museum's experiment.
The turbine, made of aluminum air foils, is actually designed in three sections, which reduces stress on the structure when there's a significant difference in wind speeds between the top and the bottom of the turbine. Though it spins even in slow winds, it doesn't start generating electricity until wind reaches 8.5 miles per hour.
May 20, 2010 4:00 AM PDT
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
Conversation powered by Livefyre