Weight. In order to start the turbine spinning at the lowest possible wind speed (meaning it will spin more often) it helps for the blades to be as light as po

Weight. In order to start the turbine spinning at the lowest possible wind speed (meaning it will spin more often) it helps for the blades to be as light as possible. There are other factors involved in getting the blades to spin, but that is an important one. (other factors include the size of the magnets in the coil, the shape and length of the blades, whether it is initially pointing into the wind or not - and how much it takes to turn it into that breeze - and so on).