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The fineness ratio of an aerofoil is defined as the ratio of its chord length to its maximum thickness, while the thickness ratio is the ratio of the maximum thickness to the chord length. Generally, a higher fineness ratio indicates a more streamlined shape, which can improve aerodynamic performance, while a lower thickness ratio may enhance structural integrity and reduce drag. The interplay between these ratios affects the overall aerodynamic efficiency and lift-to-drag characteristics of the aerofoil. Optimizing both ratios is crucial for achieving desired performance in various flight regimes.

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