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Pressure coefficient of the three wing models at (a) r/R = 0.3 and (b) r/R = 0.75 at the middle position of the downstroke (t/T = 0.25); the subfigures show the cross section of the three models and location on the hind wing. Blue, red and green lines indicate flexible, rigid and twisting wings, while solid and dashed lines show pressure coefficient values on bottom and top surfaces, respectively. (Online version in colour.)
