[aerohead]

Originally Posted by kach22i

I'm trying to find a link where they discuss that aspect.

Please link and quote it if you find it before me.

On jet aircraft and on my hovercraft splitter experiments, wavy edges break up the sound nodes for a quieter top frequency level.

I have no idea what they are doing on this car.

Old thread related:
Fan & Propeller shapes: Sickle and Curved


Propeller also shown here:
Prop blade shapes, noise, etc. - The Virtual Hoverrally

EDIT-1: from the very first link posted.
「ギザギザ」流行の兆し？: ザッカー編集部スタッフのリレーコム©ãƒ*


Something is being lost in the translation.

I'm not sure what the scallops will do on the car,but most noise nowadays is from the tires.