You're flying in a twin-engine turboprop aircraft, with its two propellers turning at 981 and 997 rpm, respectively?

You're flying in a twin-engine turboprop aircraft, with its two propellers turning at 981 and 997 rpm, respectively. How often to you hear a peak in the engine sound?

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  • 3 weeks ago
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    beats would be at 997 – 981 = 16 RPM

    that is 16 beats per 60 sec

    or one every 60/16 = 3.75 s

  • 3 weeks ago

    there are 16 beats per second

    so

    you would hear a max every 16th of a second or every 0.0625 s

    this below the threshold of human heaaring (20 Hz)

    and would be heard as a series of rapid pulses instead of a tone (buzz)

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  • 3 weeks ago

    =60/(997-981)=60/16=266.66...mHz

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