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Published online by Cambridge University Press: 04 July 2016
The designer's task is always to choose the best compromise to meet the various conflicting requirements put upon him. This task is eased when these requirements and ways of meeting them are expressed precisely in numbers, which is so in most performance work, but rarely true of safety or reliability.
In these latter areas the feedback of operational information shows when a problem exists and how important it is. For existing aircraft a solution must often be sought by ad hoc tests before the results of fundamental research are available.