Neatorama Posts Tagged "KoppEtchells Effect"
The Kopp-Etchells Effect: Eerie Halo of a Helicopter's Rotor Blades in a Dust Cloud

Photo: Michael YonReporter and former Green Beret...  ...and Michael decided to name it the Kopp-Etchells Effect , as a tribute, after Corporal Benjamin Kopp and C...

https://www.neatorama.com/2009/09/01/the-kopp-etchells-effect-eerie-halo-of-a-helicopters-rotor-blades-in-a-dust-cloud/
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