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You don't need to instrument the aircraft, a matrix of microphones can also be used for that. I remember that the German Aerospace Agency used such 2D arrays for measuing sound of landing aircraft and during wind tunnel tests to find the biggest noise sources during landing, making the sources of sound visible in videos.
But I would rather bet on the supercharger there, the two-stage supercharger of a P-51D is much louder at low altitudes than the single-stage supercharger of earlier Merlin engines.
But I would rather bet on the supercharger there, the two-stage supercharger of a P-51D is much louder at low altitudes than the single-stage supercharger of earlier Merlin engines.
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