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Windmill Efficiency

Windmill Efficiency | Science Fair Projects | STEM Projects
We'll build a windmill and measure the current output when the blades are at different angles. We'll also measure the current output when the blades are different sizes.


The hypothesis is that the closer the blade is to 45 degrees, and the bigger the blade, the more electricity the windmill will produce.

Method & Materials

You will build a windmill, attach blades of different sizes and angles, measure the current output, and take notes.
You will need electrical wires, a rubber band, a fan, a tape measure, a windmill, an ampmeter, a protractor, an electrical generator, and 8 blades of 5cm x 1cm, 10cm x 1cm, 15cm x 1cm, and 20cm x 1cm.


The results showed that the closer the angle of the blade to 75 degrees, the more electricity was produced for all blade sizes except 100 cm2. At 90 degrees, there was no current generated at any of the blade lengths. The hypothesis was rejected because the greatest amount of electricity was produced at the 75 degree blade angle.

Why do this project?

This science project is interesting because it shows how the angle and size of the blades affects the efficiency of a windmill.

Also Consider

Variations to consider include testing different blade widths and testing different wind sources.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related video

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