A reader asks, “What do you think of this idea?” Let’s do some math, and call the length of the blades x. the swept area of this device is 4πx2. The radius of one big turbine, assuming the blade tips …
A reader asks, “What do you think of this idea?” Let’s do some math, and call the length of the blades x. the swept area of this device is 4πx2. The radius of one big turbine, assuming the blade tips …
