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Fig. 9. Sectional streamline plots at half-wing length at various times during one cycle (advance ratio J=0.53). {tau}, non-dimensional time; {tau}c, non-dimensional period of one cycle; {alpha}, angle of attack of wing (the spatial interval of the incoming streamlines can be seen from the left or right of a plot). (A-C), downstroke; (D-F), upstroke.





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