Quote Originally Posted by Ronin13 View Post
Coolest thing ever to see is rotor blades creating a static discharge with dirt/sand particles when spinning (known as the corona effect)... Saw it a lot in Afghanistan:
Corona is a beer dude... Called the Kopp-Etchells effect. The phenomenon has no name. Reporter & former SF Michael Yon decided to name it the Kopp-Etchells Effect, as a tribute, after Ranger Benjamin Kopp and Corporal Joseph Etchells, who died in Afg.