When building windmills, people think about how to enhance their efficiency. To do that, they examine the mechanism. The most significant parts of a windmill are, obviously, windmill blades.

The 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 rotate. The old ones used to have four extremely bulky blades. Most of them were use in grain grinding. Now, the most recent windmills are equipped with 2 or 3 blades.

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

In addition, the shape of windmill blades influences their rotation. There're many different shapes of windmill blades: the flat, rectangular types, the wing shaped ones and the ones with both edges tapered to a slim line or both edges rounded like the ones of an aircraft wing. In the case of the horizontal axis windmills, the wing shape has proved to be by far the most effective one. The vertical axis windmills works well with all the shapes of the windmill's blades, but the greatest performance is given by the flat types 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 normally made from wood. Although those windmill blades are made of wood, their structure modified over time. They are much lighter now so that they could spin faster. A regular material which brings a high performance due to its sharp edges and its light weight is carbon fiber. One more material that's light, but also cheap 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 expensive, more efficient solution.

Windmill blades are constantly developing, even though 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 desirable 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 that will not just save our money, but also our environment.

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