The Kopp-Etchells Effect – Helicopter Rotor Blades Glow in a Dust Cloud
A Glowing Dust Halo – I find this really cool:
When helicopters pass through dust storms (kicked up from the ground as the heli lands), contact of the particles with the rotating titanium/nickel blades produces either sparks or static electricity.
The phenomenon has been observed during combat operations in Afghanistan; Reporter and former Green Beret Michael Yon has documented the effect, and has named it after two U.K. soldiers who died there.
A tribute to Corporal Benjamin Kopp and Corporal Joseph Etchells.
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