I always thought the 4 rotors sounded nice with that high pitched wail. The 3 rotor was loud but still sounded good, but the 2 rotor that ran IMSA Lights back in the 80's was the real eardrum rattler. It was real buzzy sounding and was literally THE loudest thing I have ever heard, coming from a guy who's seen bands like Motorhead and Ministry from the front of the stage.
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