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Essay Details:
Essay text:
The results of the
experiments showed that: a) vortices are generated during different phases of the
stroke and during the downward kick in undulatory swimming, flutter kick and
breaststroke kick; b) when the hand suddenly changes the direction of its
movement the starting vortex is detached from the hand and; c) the size and
movement characteristics of the vortex seem related to propulsion obtained by the
hand and foot movements.
KEY WORDS: swimming propulsion, vortex, flow visualisation, bubble wall.
INTRODUCTION: THE BASICS OF SWIMMING PROPULSION: The total mechanical
power (Po) produced by the swimmer (assuming a constant velocity) equals the power to
overcome active drag (Pd) plus power expended in giving masses of water pushed away a
kinetic energy change (Pk) (Toussaint, 1992):
Po = Pd + Pk (1)
(Counsilman, 1971) stated that efficient propulsion is obtained by pushing a large mass of
water a short distance without much acceleration...
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