Could the concept of Apple's fans with asymmetrically spaced blades be applicable to larger fans, like on turbofan jet engines, for noise reduction? - Quora
![engine - Why are the blades of car radiator fans unevenly spaced? - Motor Vehicle Maintenance & Repair Stack Exchange engine - Why are the blades of car radiator fans unevenly spaced? - Motor Vehicle Maintenance & Repair Stack Exchange](https://i.stack.imgur.com/vW7O1.jpg)
engine - Why are the blades of car radiator fans unevenly spaced? - Motor Vehicle Maintenance & Repair Stack Exchange
![Reduction of the tonal noise annoyance of axial flow fans by means of optimal blade spacing - ScienceDirect Reduction of the tonal noise annoyance of axial flow fans by means of optimal blade spacing - ScienceDirect](https://ars.els-cdn.com/content/image/1-s2.0-S0003682X06001666-gr1.jpg)
Reduction of the tonal noise annoyance of axial flow fans by means of optimal blade spacing - ScienceDirect
![Effect of the uneven blade spacing on the noise annoyance of axial-flow fans and side channel blowers - ScienceDirect Effect of the uneven blade spacing on the noise annoyance of axial-flow fans and side channel blowers - ScienceDirect](https://ars.els-cdn.com/content/image/1-s2.0-S0003682X21000177-gr1.jpg)