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Fig. 6. Velocity vectors from the rear at Re
1400. These slices were
captured in an identical fashion to those in
Fig. 5 except that they were
spaced every 0.5 cm with the camera closer to the wing. The wing tip is to the
left, the leading edge (top) is into the page, the trailing edge (bottom) is
out of the page, and the wing is sweeping away from the viewer and is caught
during mid-downstroke. Note the localized high velocity movement of fluid in A
and B, possibly representing the front edge of the spiral vortex. By E, the
laser sheet is capturing the rear of the spiraling leading edge vortex.
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