THE possibility of sustained flight by heavier‐than‐air machines was fully recognised during the last century by those who had studied the aerodynamic problems involved, and it was realised that its accomplishment awaited only the development of a prime mover of sufficiently light weight.
Ricardo, H.R. (1930), "Progress in Aircraft Engines: The Development of the Aero Engine Surveyed with Suggestions for Radical Changes in the Future", Aircraft Engineering and Aerospace Technology, Vol. 2 No. 7, pp. 177-180. https://doi.org/10.1108/eb029290Download as .RIS
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