Clutch fan vs derale single 2400cfm fan

In regards to mechanical fans. more blades the better?
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It would seem so but I don’t know for sure. I’d bet there’s a bit of science behind the use of less blades. One example is the MP Viscous fan package offered for years and years that came with 5 blades oddly spaced apart. All I know about it is, it really moves some air!