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Everyone that I have talked to likes the "S" curved blades. I bought a Zirgo 2750 rpm "S" blade puller fan for my hot rod and man does it ever pull some air. They claim they are quieter than the straight blade but I have no way to compare.
 

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327NUT said:
Everyone that I have talked to likes the "S" curved blades. I bought a Zirgo 2750 rpm "S" blade puller fan for my hot rod and man does it ever pull some air. They claim they are quieter than the straight blade but I have no way to compare.
I remember reading that the U.S Navy did some tests with different shaped propellers and settled on the "S" shape as being the most efficient.
 
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