I kept wondering how Bin Laden could have missed 3 or 4 choppers flying towards his compound. I have had several of those fly over my house before, and those things aren't quiet. In fact, one of them shook my bedroom as it flew overhead (when the President visited the Bay Area, i.e. Google).
Well, the video below about the differences between the standard and the "updated" rotors now makes a lot of sense.
Article of the design.
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