3 ms·

I imagine passengers will be exposed to very high noise levels during flight.

• BurningFrog 4mo ago
  I don't have a good intuitive feel for that. At 25km altitude, with 1% of normal atmosphere, maybe you're close enough to vacuum that it can get really quiet?
  • pdonis 4mo ago
    The engine noise can still be conducted through the body of the plane. With the kind of ramjet being talked about, I think that's still likely to be significant even at very high altitude.
  • stymaar 4mo ago
    This effect would help mitigate the noise heard by people outside of the plane (but I suspect that noise is negligible compared to the sonic boom), but in the plane the sound would mostly be propagated though the fuselage of the plane, not through air, so it's not going to help.