I understand the turbines, what I don’t understand is the wind can carry just three blades that look very thin. Why not make very thick blades, and lots of them? Old windmills had three blades (I have no idea why), but they had must thicker blades.
*much thicker
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The modern blades are very light thus the wind can spin them well. These blades are also well designed and the biggest problem most windmills face is that they spin too fast, all of them have brakes of some form or another. The few small blades are light and strong, they are also cheap to produce.
With old windmills, they had old technology and little knowledge of aerodynamics. Now they know that they can build a more efficient windmill with three blades. These blades are like high lift aircraft wings. The old windmills just had flat plates for blades.
With longer blades, they get more torque to turn the generator. The generator is designed to produce power at lower RPMs. There are a lot of other things that go into the design of today’s wind turbines.