Stick with me, folks.
I wouldn't normally turn to Fox News for my science reporting, but their story does the best job - of the ones I quickly searched on YouTube - of explaining the Kopp-Etchells effect in which the edges of helicopter rotor blades get abraded via airborn grains of sand, sending showers of pyrophoric tittanium-nickel alloys into the air and making for a lovely light show - that admittedly shortens the lifespan of the blades and advertises the presence of the helicopters at night.
Effectively, it turns the edges of the blades into sparklers.
It makes for some really pretty pictures, though...
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| Source - reddit |
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| Source - wikipedia |
Here's another video with a little more science presented in meme-ified format.
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