Designing a Wind Velocimeter

For my junior-level instrumentation class, my team and I were assigned to create a device to calculate wind speed and direction.  Using parts from around the lab, we created this:

Air Speed Measurement Device

This device used a hobby propeller attached to a DC motor, mounted as a windmill on a potentiometer.  The wind would cause the propeller to spin, creating a measurable voltage difference across the motor terminals.  The resistance across the potentiometer indicated the direction.

ImageThe device was calibrated and tested in a wind tunnel.

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