As soon as I caught glimpse of the first leaked pictures showing the tail rotor of the helicopter that seal team 6 had destroyed and left behind in Abbottabad, I knew it was a new type of stealth helicopter. It was not so much my interest in aeronautics as my experience as a computer technician that gave me the clue.
The blades of the tail rotor had a very familiar shape, one I've seen a lot of. They had been designed to optimize certain aerodynamic properties. They looked very similar to the blades of the fans routinely used for cooling in our desktop computers. And those fans are designed to be quiet.
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