THE achievement of a reasonable degree of silence in aircraft cabins is chiefly difficult because of the amazing intensity of the noise made by the airscrew and engine. There is, in addition, the difficulty of excluding this noise from the cabin without unduly adding to the weight of the structure.
Wimperis, H.E. (1930), "The Reduction of Noise in Aircraft: A Discussion of the Physical Aspects of Measuring Cabin Noises Quantitatively as a Preliminary to Taking Steps Towards Their Elimination", Aircraft Engineering and Aerospace Technology, Vol. 2 No. 4, pp. 79-79. https://doi.org/10.1108/eb029253
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