What is the pitch/depth of the factory 7 blade? I’m not sure myself but am wondering if is it more or less than the 6 blade Derale he is using which has a depth of 2-5/16” (28 degrees) The 17” aluminum blade version (that I have on a 78 D150) moves some air, but actually has slightly less pitch. I always understood it’s not so much the number of blades rather it’s the pitch. The one he is going to use is IMO a “heavy hitter” of a fan
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