IN the early stages of design, when the general conception of the aeroplane is discussed, it is important for designers to realize the numerical influence of changes in the design parameters (characteristics) upon the performances.
Stepniewski, W. (1940), "The Prediction of Performance: The Estimation of Performance by means of the Speed Polar Diagram and the Principal Characteristics", Aircraft Engineering and Aerospace Technology, Vol. 12 No. 12, pp. 361-365. https://doi.org/10.1108/eb030722
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