When building windmills, people think about how to enhance their effectiveness. In order to do that, they analyze the parts. The most critical components of a windmill are, naturally, windmill blades.

The very first thing to think about when talking about windmill blades is their number. The higher number of blades a windmill has, the harder will be for it to work. The old ones used to have 4 very bulky blades. Many of them were use in grain grinding. These days, the most modern windmills have 2 or 3 blades.

The length is critical also. If a blade is longer, it covers a larger surface when it rotates, so they can catch more wind with each rotation. This may result in more torque. To protect the windmill blades we must not forget about their surface. If we provide them with effective maintenance, they'll last longer and will also be more efficient.

Furthermore, the shape of windmill blades influences their rotation. There are several different shapes of windmill blades: the flat, rectangular types, the wing shaped types and the ones with both edges tapered to a thin line or both edges rounded like the ones of a plane wing. In case of the horizontal axis windmills, the wing shape has proved to be by far the most effective one. The vertical axis windmills works extremely well with all the shapes of the windmill's blades, but optimum performance is given by the flat types and the ones with both edges rounded.

About the material with which the windmill blades are made from, if we think about the old ones, they were generally made out of wood. Although those windmill blades are made of wood, their structure modified over time. They're lighter now so they could spin quicker. A common material that brings a high performance because of its sharp edges and its light weight is carbon fiber. One more material that's light, but also low-priced is PVC. It is a synthetic material often used for windmill blades. New substances are always being tested, in the hopes of finding an inexpensive, more effective solution.

Windmill blades are continuously developing, although they appeared a very long time ago. At their early stages they were somehow inefficient, but people learned to improve them and to make the windmills a popular source of energy. Many more shapes and materials have and will be for windmill blades and people start using increasingly more this alternative source of energy which will not only save our money, but also our environment.

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