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Wind Power Question: Why do some wind turbines have two whilst others have three blades?

Answer: The majority of modern wind turbines have three blades, as this design has been found to have a greater aesthetic appeal. The disadvantage is that each blade will add to the overall cost and weight and can be more difficult to install, particularly offshore.

Two bladed turbines are cheaper and lighter, with higher running speeds, making gearbox more cost effective, and easier to install. However two bladed turbines are noisier and are not as visually attractive, appearing 'jerky' when they turn. The engineering ideal would be to have only one blade, but early prototypes were developed, and unfortunately didn't stand the test of time.

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