DURING the past few years the aeroplane has increased in performance to such an extent that normal machines of to‐day have speed, climb, load capacity, economy, and reliability characteristics, combined, only considered possible from individually specialised record making designs of ten years ago. Both airframe and engine are concerned in these gains, and the two now require to be such close partners that apportioning of credit is scarcely possible and research on both components has to proceed in step.
Mansell, H.C. (1939), "Recent Aero‐Engine Research Work: A Survey of Investigations which have Led to Improved Performance and Reliability", Aircraft Engineering and Aerospace Technology, Vol. 11 No. 3, pp. 92-94. https://doi.org/10.1108/eb030449
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