How do three blades fans produce greater rpms and speeds than four blades fan?
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Simple answer, if you add blades (all blades of the same length) there is more air resistance (drag). 4 blades move more air than 3 blades. A 4 blade fan can move the same volume of air as a 3 blade fan but at a lower rpm.
https://dronesgator.com/how-many-blades-for-a-drone-propeller/
Here is also a nice read on number of blades in drones.
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