THE performance of an aeroplane is largely determined by certain general characteristics—such, for instance, as its power and surface loadings, etc.—from a knowledge of which an approximate estimate of its performance can be made. Such an estimate is generally effected by the use of a “general curve” connecting the performance with the determining characteristics.. On this curve are represented known performances of a number of different types of aircraft, which are useful when making an estimate, and may be regarded as a comparative means of allowing for the factors not taken into account in the curve.
Clarkson, R.M. (1933), "The Estimation of Performance: An Account of a Practical Method by General Curves which has been Proved Accurate", Aircraft Engineering and Aerospace Technology, Vol. 5 No. 1, pp. 3-5. https://doi.org/10.1108/eb029642Download as .RIS
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