AN interesting feature of modern aeroplane design is the growing use of duct systems. The low drag and heat regeneration obtainable from a cooling duct is now an accomplished fact. Ventilation systems for cabin aircraft have been introduced. In the future we may see duct systems used in connexion with the control of the boundary layer. As aeroplane design is improved, new applications of duct systems continue to appear.
Patterson, G.N. (1939), "The Design of Aeroplane Ducts: Rules to be Followed for the Reduction of Internal and External Drag", Aircraft Engineering and Aerospace Technology, Vol. 11 No. 7, pp. 263-268. https://doi.org/10.1108/eb030509
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