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Published online by Cambridge University Press: 28 July 2016
One of the outstanding questions of the hour is the form of power plant which is likely to prove most satisfactory for various classes of transport aircraft for various stage lengths.
“Most satisfactory” can, of course, cover a multitude of desirable features. But there is one pre-eminent requirement which should always Jbe kept in view. That is that the combination of airframe and engine considered should be capable, first of covering its direct operating costs plus overheads and, having done that, of flying as fast as possible.
Note on page No 663 * Reserves for diversion of 300 still-air miles to alternate plus 1.5 hours “stack up.”
Note on page No 690 * Assuming that one letter weighs one ounce and that the average distance of helicopter mails is 100 miles, each letter would cost 0.66 pence to carry. At 
pence per letter the Post Office would not be out of pocket on the deal.