What do you need to consider when building windmill blades?

When building windmill blades, it's essential to consider factors such as material strength and weight to ensure durability and efficiency. The blade design must optimize aerodynamics to maximize lift and reduce drag, while also being engineered for the specific wind conditions of the location. Additionally, considerations for maintenance, manufacturing costs, and environmental impact are crucial for sustainability and economic viability. Lastly, the size and shape of the blades must balance energy output with structural integrity and safety.