That's a good question. Do you just want the wind turbine to spin or do you want it to produce electricity? Taking the Richuan brand 300W wind turbine as an example, the breeze can turn it and the blades can be turned with just one hand. But it can only be charged if there is a continuous wind of about 4.5. This still uses low-voltage charging technology. If a low voltage load is not added, normal Level 8 wind charging will produce electricity at approximately 140 revolutions per minute.
The unit of wind energy power is W/m2 (Watts per square meter). When the average annual wind speed is 7 m/s, the wind power is 400 W/m2. the blades of the wind turbine, the greater the power of the wind. The scanning area is also larger (C = R2). The larger the sweeping area, the more wind energy it absorbs and the more electricity it generates.
In simple terms, whenhe wind speed is constant, the longer the blades, the more electricity is generated. Of course, you shouldn't stress it for too long, as problems can arise and it can be easily damaged.
The reason they are thin is to reduce the mass of the blades, otherwise they would be too heavy to be blown by the wind and produce electricity.