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When riding an A3xx I always noticed the unique "turboprop" like sound when close to full throttle. Why is that so?

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  • $\begingroup$ Sure would help if you could provide a link containing audio of what you're describing... $\endgroup$
    – Stu Smith
    May 6 at 5:00
  • $\begingroup$ If you're referring to the buzzing/chainsaw/growling sound, it's not only Airbus, I've heard it on Embraers, and Boeings too. $\endgroup$
    – MD88Fan
    May 6 at 11:59
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I'm assuming you mean that buzzing/growly/deep humming sound.

That is the tips of the fan blades in the first stage fan disc approaching the speed of sound, and getting close to forming shock waves. Their noise generation becomes strong at that point.

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