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

The very 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 rotate. The old ones used to have 4 very bulky blades. Many of them were use in grain grinding. Now, the most recent windmills are equipped with two or three blades.

The length is important as well. If a blade is longer, it covers a bigger surface when it rotates, therefore they can catch more wind with each rotation. This may contribute to extra torque. To protect the windmill blades we mustn’t forget about their surface. If we provide them with efficient maintenance, they will last longer and will also be more efficient.

Additionally, the shape of windmill blades influences their rotation. There are several different shapes of windmill blades: the flat, rectangular ones, the wing shaped types and the ones with both edges tapered to a slim line or both edges rounded like the ones of a plane wing. In the case of the horizontal axis windmills, the wing shape has proven to be by far the most effective one. The vertical axis windmills works very well with all the shapes of the windmill’s blades, but the greatest 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 usually made out of wood. Although those windmill blades are made of wood, their structure changed over time. They are much lighter now so that they can spin faster. A common material that brings a high performance due to its sharp edges and its light weight is carbon fiber. One more material that’s light, but also economical is PVC. It’s a synthetic material sometimes used for windmill blades. New substances are always being tested, in the hopes of finding a less costly, more efficient 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. A lot more shapes and materials have and will be for windmill blades and people begin using increasingly more this alternative source of energy which will not only save our money, but also our environment.

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