Anemometer - Wind Speed
thingiverse
This gadget measures the wind speed by having spinning magnets attached to the base of a shaft. To assemble it, check out this instructable:http://www.instructables.com/id/Air-Pressure-Rocket-Launcher-System/step3/Anemometer-3D-print/ A video that tests the device in a wind tunnel can be seen at: https://www.youtube.com/watch?v=L9_lE5_IwN8
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