Published online by Cambridge University Press: 28 July 2016
No one denies that speed is an essential to air travel. It seemed curious to me that air liners were operating at speeds varying from 100 to 150 miles an hour, and some months ago I set out to find a logical basis for determining the most economical speed of flight. I did not expect to arrive at an exact solution; but, rather to my surprise, I satisfied myself that I could give a general answer to most of the problems that interested me. I ventured to submit my calculations in a short memorandum to the Aeronautical Research Committee, and I had the privilege of meeting a sub-committee with whom I discussed my ideas. It was suggested that some further calculations on the same lines would be of interest, and it was proposed by Mr. Tizard, the Chairman of the main committee, that I should send a communication on the subject to the Aeronautical Society. The paper that I am reading to-night is the result of this suggestion.
Note on Page 451 * There is one exception to this statement. Twin-engine aircraft intended to fly on one engine only need a much lower horse-power weight ratio than three or four-engine aircraft. They therefore need special consideration.
Note on Page 461 * Note.—This did not appear in the lecture as read. It is added for the convenience of those who may read the paper and not the discussion.