When building windmills, people think about how to increase their effectiveness. To do that, they analyze the parts. The most vital components of a windmill are, certainly, windmill blades.

The first thing to consider when talking about windmill blades is their number. The more blades a windmill has, the harder will be for it to work. The old ones used to have four very heavy blades. Many of them were use in grain grinding. Nowadays, the most modern windmills are equipped with 2 or 3 blades.

The length is significant as well. If a blade is longer, it covers a bigger surface when it rotates, therefore they can catch more wind with every rotation. This may contribute to more torque. To protect the windmill blades we must not forget about their surface. If we provide them with efficient maintenance, they'll last longer and will also be more productive.

Besides, the shape of windmill blades influences their rotation. There're a few different shapes of windmill blades: the flat, rectangular ones, 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 the case of the horizontal axis windmills, the wing shape has proved to be by far the most efficient one. The vertical axis windmills works well with all the shapes of the windmill's blades, but the best performance is given by the flat ones 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 from wood. Although those windmill blades are made of wood, their structure changed over time. They're much lighter now so they can spin quicker. A common material that brings a high performance due to its sharp edges and its light weight is carbon fiber. One more material that is light, but also economical is PVC. It's a synthetic material often used for windmill blades. New materials are always being tested, in the hopes of finding a less costly, more effective solution.

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

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