hypothesized that the
shark tail would form a single wake structure during a lateral pass
of the tail and that this structure would be composed of two rings one associated with the longer dorsal lobe inside
another one associated with the whole tail.
It was expected that this single
wake structure would be released from the tail as it reaches maximum lateral
excursion and changes direction, e.g. when the velocity
equals zero, just as was known to be true for all undulating bodies in
a fluid. However, with the use of three-dimensional hydrodynamic
analysis methods that are able to capture an entire volume of
the wake produced behind an undulating body