Post date: 24-Nov-2009 09:30:00
Have you heard anything about the Kopp-Etchells effect? In fact, the Kopp-Etchells effect is a new name. Reporter and former Green Beret Michael Yon took a series of intriguing photos of glowing rotor blades as a helicopter lands in a military base in Afghanistan.
The phenomenon, has no name – and Michael decided to name it the Kopp-Etchells Effect, as a tribute, after Corporal Benjamin Kopp and Corporal Joseph Etchells, who died in battle.
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.
Jacques send this ... Thanks !!!