When building windmills, people think about how to improve their efficiency. To do that, they examine the mechanism. The most significant components of a windmill are, naturally, 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 rotate. The old ones used to have four extremely bulky blades. Most of them were use in grain grinding. Nowadays, the most modern windmills have two or three blades.

The length is critical too. If a blade is longer, it covers a bigger surface when it rotates, so they can catch more wind with each rotation. This may lead to more 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.

Also, the shape of windmill blades influences their rotation. There're a number of different shapes of windmill blades: the flat, rectangular types, the wing shaped ones and the ones with both edges tapered to a thin line or both edges rounded like the ones of an aircraft 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 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.

Regarding the material with which the windmill blades are made from, if we think about the old ones, they were normally constructed from wood. Even though those windmill blades are made of wood, their structure modified over time. They are much lighter now so that they could spin faster. A common 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 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 effective 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 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 only save our money, but also our environment.

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