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Fig. 2. Vorticity measurements at both Re. (A) Side views of wing at 0.65R (R is the length of one wing) at mid-downstroke. Wing is moving to the left at an angle of attack of 45°. Note the stronger and larger leading edge vortex at the higher Re. (B) Circulation around the wing as a function of wing length. The vertical line at 0.65R represents the position of the pseudocolor plots in A. The area of greatest vorticity shifts slightly towards the wingtip at high Re, occurring at 0.65R versus 0.49R at low Re.