Quote:
Originally Posted by thefourthtower
The hub
A Wind turbine hub being installed
In simple designs, the blades are directly bolted to the hub and hence are stalled. In other more sophisticated designs, they are bolted to the pitch mechanism, which adjusts their angle of attack according to the wind speed to control their rotational speed. The pitch mechanism is itself bolted to the hub. The hub is fixed to the rotor shaft which drives the generator through a gearbox. Direct drive wind turbines (also called gearless) are constructed without a gearbox. Instead, the rotor shaft is attached directly to the generator, which spins at the same speed as the blades. Source Wikipedia , the blades will add some height also .
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Thanks for the correction. As far as installing, there are two different ways,1, is by lifting the full hub (including 3 blades)= more weight bigger crane or separate. the blades will be installed horizontal. As far a crane go, the most common crane will be around the 600 to 750 ton range with Derrick (aka super lift) that will in crease capacity at greater radios. I can not tell on till i see some pictures off the crane to so what type it is. A type/identification plate is commonly found at the control cab or close to it.
If any one is interested in how a wind turbine is in stalled, look at the link. The crane is a 750 ton Lattice boom crane from liebherr.
http://forums.dhsdiecast.com/default.aspx?g=posts&t=134179&p=4
Or check my Youtube channel to see what a crawler crane is.