3 ms·

Engines in modern aircraft are phase-locked, though.

• mrob 2y ago
  The majority of the engine noise is caused by the turbulent mixing of the exhaust with the surrounding air. Turbulence is chaotic, so even if the engines are phase locked the sound rapidly becomes incoherent.
• Toutouxc 2y ago
  Do you have a source for that? I’ve heard about something that some twin-props have, but definitely not jets. The engines don’t even run at the same RPM.
  • jeffbee 2y ago
    https://www.osti.gov/biblio/6356085 https://www.osti.gov/biblio/6356085 It is what the "Sync" switch on the panel does.
    • Toutouxc 2y ago
      Yes, but it seems like no turbofan synchrophaser systems have been implemented yet. Only on turboprops. https://aviation.stackexchange.com/questions/71738/is-engine-sync-to-avoid-beat-frequencies-also-a-concern-for-jet-engines https://aviation.stackexchange.com/questions/71738/is-engine...
      • deleted 2y ago
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