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Fig. 14. Coefficients of power for translation CP,t (A) and for rotation CP,t (B) versus time in one cycle for various advance ratios J. {tau}, non-dimensional time; {tau}c, non-dimensional period of one cycle (stroke amplitude {phi} and stroke plane angle ß vary with flight speed; midstroke angle of attack {alpha}m=46.5°; stroke frequency n=240 s-1).