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posted: 1 Sep 2009 / 8824 views
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In fact, the Kopp-Etchells effect is a new name.
It was named after two soldiers who died in Afghanistan in July 2009. The Kopp-Etchells effect is a result of dust striking helicopter blades as they take off or land at night, causing a bright 'halo' effect around the spinning rotor disk.
So, if it happens at night, you can watch an amazing show.
Take a look at pictures.


Have you heard anything about the Kopp-Etchells effect? (30 pics)

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