What are windmill blades? How can we use them? Why do we need them? Since the early 20th century, human history experimented rapid growth especially in science, and industries. This rapid and ever growing growth not only demanded more manpower but also it require more energy. Now science has reached at a place where it require minimum interference of human and all sophisticated jobs are done by the machines. To run these machines, industries need huge amount of energy or we can say that for industrialization we also require huge amount of electricity. There are few methods to produce electricity such as by hydraulics, atomic energy, solar power, and by air through windmill blades. Every country of the world tries to adopt the cheapest way of producing energy by its own resources. For hydraulic and atomic methods, not every country is self sufficient in the resources which are required to produce energy by these two methods. Third method of solar is off course available in most of the countries of the world around the year but up till now the cost of solar cells is so high that energy cannot be produced on commercial basis by solar power. The last and fourth method to produce energy is by producing windmill electricity through windmill blades.
Windmills as we all know work by air only. In windmill technology the most important part is the windmill blade. You may have come across huge windmill blades installed on tall polls in country side areas or near the beaches. Wind blows more quickly in open areas like country sides or at the sea side. There are various designs and sizes of windmill blades. In childhood, we also made a type of windmill blade by paper and use to through from the heights to see amazing turns it takes while travelling towards the earth. All windmill blades works on one simple method. They are designed in a way that slightly blowing wind can move them quickly.
A typical windmill may consist of three to twenty individual blades. The number of blades totally depends on the design of windmill itself. Windmill blades are made of plastic, wood or light weighted aluminum. Usually researchers and manufacturers try to manufacture light weight windmill blades because light weighted blades will automatically able to move quicker and more rapidly in slightest wind.
There is always a debate about windmill blades that either they should be made horizontally and vertically. Some list more advantages of horizontal windmill blades and less advantages of vertical blades whereas the opposite group supports the vertical instead of horizontal. Whether horizontal or vertical blades are used, the basic purpose of windmill blades is to move the shaft installed underneath them more quickly which results in more efficient movements of windmill turbine blades which are mainly responsible to produce electricity. The technology of windmill is not common all over the world. There is a strong need of technology transfer of windmill and windmill blades to under developed countries especially countries belonging to third world enabling to utilize the power provided by nature and overcome their power shortages round the year.