THE trend of design in the modern aeroplane has been toward improved performance realised through external cleanness. It is apparent that the number of essential units comprising a modern aeroplane is nearly a minimum at the present stage of the art, and it appears also that the possibilities of further striking reductions in the drag of these units, due to change in form or shape either individually or in combination, are not great.
Beisel, R.B., MacClain, A.L. and Thomas, F.M. (1934), "The Cowling of Radial Engines: An Extended Series of Experiments by the Chance Vought and Pratt and Whitney Group", Aircraft Engineering and Aerospace Technology, Vol. 6 No. 6, pp. 151-158. https://doi.org/10.1108/eb029804
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