February 4, 2015 by Charlie Eisenhood in Livewire with 0 comments
It’s not just for grip. From Wired Magazine:
In 1955 [Walter Morrison] sold his [frisbee] invention to Wham-O—manufacturer of slingshots and Hula-Hoops—where a product designer named Ed Headrick made the final tweak of rippling the top with concentric ridges. These add turbulence, which holds air against the surface for a longer flight.
Engineers have since validated those design choices.