Hi Gary,
This is true for a symetrically shaped blade. Fan blades are frequently
made with a nonsymetrical shape to enhance pumping in the intended
direction. Obviously neither type will pump backwards, but one direction
is more efficient than the other.
Dave Russell
BN2
G. Brierton wrote:
> As long as the blade is spinning in the original direction, the blade
> moves the air in the same direction no matter how you flip it around.
> You have to make a different blade to move the air in the opposite
> direction.
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