It might be cheaper to enclose the blades' path in cages, or add more (possibly dummy) blades to make the path appear more filled, if that's been a problem. Ma

It might be cheaper to enclose the blades' path in cages, or add more (possibly dummy) blades to make the path appear more filled, if that's been a problem. Maybe a ring around the tips of the blades, and the blades double as spokes. They'd be ugly, but birds would fly into them less, and power output would get slightly smoothed by the weight shifted to the exterior of the wind wheel.