FOTO'S: het Kopp-Etchells Effect bij Chinooks in de nacht...

[Stratofreighter]

Until recently, the dazzling visual effect caused by helicopter blades hitting sand and dust - and creating mesmerizing halos described as 'one of the most beautiful things you'll ever see in a war zone - had no specific name; observers would simply marvel at the breathtaking sight without an understanding of what was causing it - or what to call it.

Now, however - to honor the memories of two soldiers killed in the war in Afghanistan - the physics that create these types of breathtaking halos has a name: The Kopp-Etchells Effect.

...en dat effect ziet er 's nachts dus ZO uit:
http://www.dailymail.co.uk/news/article ... diers.html