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It's the Rotors

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Anyone who lives in certain neighborhoods hears the constant LAPD helicopter action in the sky. Sounds like things are worse in Pasadena. According to the Pasadena Weekly, the skies are patrolled via "loud, Vietnam-era copters that the Police Department received for free through a military surplus program." But as neighbors gripe about the helicopters, the Air Operations Division is replacing the 40-year-old helicopters with quieter versions, modern ones that have five overhead blades instead of two, and four tail rotor blades, not two. Experts say the current "loud whooping" from the copters comes from two-bladed tail rotors. [Pasadena Weekly]