Why is the impeller of my Kestrel® Windmeter NOT balanced? Why does one blade remain down no matter how I rotate the rest of the instrument?
The Kestrel® impeller IS balanced, and to a very high degree. It APPEARS to be imbalanced because of the tiny magnet incased within the impeller. The force acting on your impeller blade is magnetic, not gravitational. If you want to test this out, simply hold your Kestrel® horizontally, and then rotate the entire instrument in the horizontal plane. PIC You will see that the impeller does not rotate. It acts like a compass and remains stationary. This is how it SHOULD act when properly operating. Looking at the issue more technically, there are no known effects from either the weak or strong forces. The earth’s magnetic field has a vertical component everywhere but the equator, and this component creates a torque on the magnet mounted on the impeller shaft. Although the earth’s field does provide a weak aligning force, which causes the impeller to oscillate as it comes to a stop, there is NO effect on the accuracy of the windspeed reading. This is because the force acting on the impelle
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