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Changing the angle of the vanes has wielded some improvement.


The (highly scientific) testing method was:

A large table fan was set level with the anemometer and the distance was slowly increased till failure to register.

Version 1: 82cm (original, left)

Version 2: 88cm (new, right)


So a noticeable and repeatable improvement.

The two anemometer were near identical in a test before the change of vane angle.

But to improve even more, I still think the vanes need to be bigger.


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