Kopp-Etchells Effect

The Kopp-Etchells effect is the name given by Michael Yon to a phenomenon he witnessed in Afghanistan.

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As a helicopter comes in to land a great cloud of dust is stirred up; the impact of this dust on the rotor blades would quickly wear the blades down, making them unsafe. The rotors are coated in titanium to resist this damage; the sparks you see are this titanium coating being worn away (a process physicists call ablation).

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