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Figure 2


Fig. 2. Representation of the cross-section of a vortex in the wake of a bird engaged in WAIR including some of the variables measured in the wake vortices. Uind, induced velocity in the momentum jet; {alpha}h, impulse angle of wake vortex relative to horizontal; {alpha}s, impulse angle of wake vortex relative to substrate; ß, inclination angle of vortex; S, width of vortex.





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