Dust lights up the rotors of a CH-47 Chinook helicopter. Small sand particles striking titanium/nickel abrasion strips on the rotors causes a visible corona at night, dubbed the “Kopp-Etchells effect” in 2009 to honor Cpl. Benjamin Kopp, and Cpl. Joseph Etchells, recently fallen American and British soldiers. (via The Atlantic)
Dust lights up the rotors of a CH-47 Chinook helicopter. Small sand particles striking titanium/nickel abrasion strips...