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A LAPD Helicopter Claimed Cops Identified Protesters From Above and Would “Come to Your House”
(www.motherjones.com)
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Rotor blades are quite robust. I used to fly RC helicopters and have hit myself (and other objects). Now, the turbines on the other hand... those are pretty sensitive. However the intakes on, say, a Bell 206 have convolutions and can easily be screened.