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When building windmills, people think about how to enhance their effectiveness. In order to do that, they examine the parts. The most important parts of a windmill are, certainly, windmill blades.

The very first thing to take into consideration 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 extremely heavy blades. Most of them were use in grain grinding. Now, the most modern windmills have two or three blades.

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

Besides, the shape of windmill blades influences their rotation. There are a number of different shapes of windmill blades: the flat, rectangular ones, the wing shaped ones and the ones with both edges tapered to a slim line or both edges rounded like the ones of a plane wing. In case of the horizontal axis windmills, the wing shape has proven 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 ones and the ones with both edges rounded.

Regarding the material with which the windmill blades are constructed from, if we think about the old ones, they were generally constructed from wood. Even though those windmill blades are made of wood, their structure modified over time. They're lighter now so that they can spin faster. A regular material that brings a high performance because of its sharp edges and its light weight is carbon fiber. Another material that's light, but also low-priced is PVC. It is a synthetic material sometimes used for windmill blades. New materials are always being tested, in the hopes of finding a cheaper, more efficient solution.

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

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