Anemometer (Weather Meter)

This is a very simple anemometer used to calculate wind speed. The only other materials required are a 8x22x7mm bearing, and 1/2" schedule 40 PVC pipe.


How to use to measure wind speed:

Calculate the distance the reference cup will travel to revolve around the axis once by taking the length of its rod from the axis, doubling it and multiplying by the value of pi. (This is the formula for finding the circumference of a circle from its radius.) Convert this distance to either feet or meters for convenience.

Count the number of times the reference cup makes a complete revolution around the axis in a minute.

Multiply the distance traveled in one revolution by the number of times the reference cup revolved around the axis. This will produce an approximate wind speed in feet per minute or meters per minute.

Convert this value to distance per hour by multiplying by 60. If the distance is measured in feet, divide by 5,280 to produce an approximate wind speed in miles per hou