How do three blades fans produce greater rpms and speeds than four blades fan?
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Each blade creates a disturbance behind it as it passes through the air. The air that is displaced by the blades as it passes through the air needs time to be replaced so there’s a void of low pressure behind the blade. Adding extra blades just means the additional blades are passing through the void of low pressure meaning each blade is slightly less efficient when adding more blades.
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