You must also exercise caution since one side of the wind turbine blade is so sharp that it might cut your rope. Blades are difficult since they have several layers, and each turbine's blades are unique, so you'll frequently be on the phone with the engineers while in the air. The whole process can be quite stressful.
The answer depends on how old the blade is and how long it has been lying on the ground. Modern blades are made of composite materials which are much harder than steel. They may actually be sharper than stone, because there are no natural deposits of bladesize stones anywhere near large wind farms. Even if a blade is not completely flat, it should still work properly since its shape is not important for efficiency. However, do not stick your hand into any hole or groove in the blade without protective gear, since you might get a nasty surprise.
Wind turbines used to be made out of wood and later metal, but now they are mostly made out of silicon carbide and other ceramics. These materials are extremely hard, which means that damaged blades can be repaired instead of being replaced. On the negative side, this also means that cleaning up after destroyed equipment will be difficult. Metal blades can be recycled, but the rest of the component cannot. There will also be some noise when they rotate since they use parts of the wind's energy to turn another part of the wind turbine which creates more friction.
Wind turbine blades are often designed to generate the most electricity from the wind while requiring the least amount of building. It's thought that by slightly bending the turbine blade, they may catch 5 to 10% more wind energy and function more efficiently in locations with lower wind speeds. These are called "wind farms" and you can see them all over Europe.
There are two types of wind turbines: horizontal-axis and vertical-axis. In both cases, the rotating part is called a "rotor". On a horizontal-axis turbine, the rotor turns about a horizontal axis, making it easy to build a large machine. On a vertical-axis turbine, the rotor turns about a vertical axis, so there must be another device to make the rotational movement visible, such as a motor or windmill hand.
These days, wind turbines are usually made from steel or aluminum, but early versions were made from wood. The first commercial wind turbine was built by Eddy House in Massachusetts in 1793. This wooden machine had three blades and could rotate a crank which powered a mill wheel that turned a hammer that beat metal into spoons for cooking food! Today, wind turbines are used for electricity production much more than for cooking spices.
In 1872, American inventor Samuel Brown patented the first modern wind turbine. It had seven blades and could produce 7 KW of power.
Access to the turbine is prohibited if wind speeds exceed 53 mph. There is a 260-foot ladder within, and the only route to the top is via climbing. Wind turbines feature three platforms throughout the ascent where climbers may see other climbs or take a break. The first two stops are simple staircases while the third requires more skill to ascend. At the top of the tower is the blade assembly, which consists of two parts: the hub and the blade. The hub functions as the center of the rotor system and includes some key components for transmitting power from the generator to the blades. The blade is the horizontal component that turns in order to generate electricity. It varies in size depending on the manufacturer and type of technology used but usually ranges from 40 to 100 feet long.
There have been several fatal accidents at wind farms in the United States. In October 2009, an electrician working on the Hatfield Wind Project in West Virginia died when he was hit by a falling turbine blade. In February 2010, another worker was killed at the same project when he was hit by another blade that fell due to high winds. A third man suffered serious injuries when a blade struck a tree at the Maryland Heights Wind Energy Center in December 2009.
Wind turbines use wind speed to determine how fast they turn. Blades spin faster as it picks up speed, thus creating more force which allows them to lift heavier objects.
The basic concept is that wind turbines employ blades to harvest potential and kinetic energy from the wind. To generate power, the wind moves the blades, which spin a rotor attached to a generator. The blades are connected to a hub that rotates when the blades revolve. The rotor is made up of the blades and the hub. They can be made of steel or, more commonly, fiberglass.
A wind turbine has three main parts: the nacelle, the hub, and the blades. The nacelle contains the components necessary for converting wind movement into mechanical power, such as the gearbox, the generator, and the shaft. The hub connects the blades to the nacelle and allows them to turn in response to wind direction and speed. The blades capture wind momentum and channel it through the hub to drive the rotor. They can be as simple as a flat piece of metal with holes to hold on to ropes (rope-blade designs) or they can be long and curved like wings (airplane-style blades). Modern blades are usually manufactured by welding several thin steel plates together to create an airfoil shape. They can be as long as 150 feet (45 meters) or more and typically weigh around 40 tons (37000 pounds). The average size of modern blades is about 30 feet (9 m) in length. The hub can be as small as one wheel mounted on a straight axle or it can be a large structure containing multiple wheels, as in the case of large-scale models.