THE POWER INITIATING POINT AND TAIL VORTEX IN SCUBA SWIMMING

The purpose of this paper was to explore the position of the power initiating point and the function of tail vortex in scuba swimming. According to the kinematics, human structure and fluid dynamics analysis, it is apparent that the waist serves as the power initiating point. Unlike the traditional concept of swimming, the tail vortex does not always provide resistance in scuba swimming. In this instance, it is necessary to avoid production of intensive vortex action, in order to reduce energy waste, which is a result of the loss of energy being positive to the square of the quantity of vortex. On the other hand, the thrust is positive to the quantity of vortex. Attention should be paid to the quantity of vortex to facilitate producing thrust necessary to overcome resistance found in scuba swimming