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A fin is a thin component or appendage attached to a larger body or structure. [1] Fins typically function as foils that produce lift or thrust, or provide the ability to steer or stabilize motion while traveling in water, air, or other fluids. Fins are also used to increase surface areas for heat transfer purposes, or simply as ornamentation ...
These shock waves are strong when they are very close to the imploded bubble, but rapidly weaken as they propagate away from the implosion. Cavitation is a significant cause of wear in some engineering contexts. Collapsing voids that implode near to a metal surface cause cyclic stress through repeated implosion. This results in surface fatigue ...
Dolphin kick can also be used with paired fins (bifins), but does not reach the same level of efficiency. Nevertheless, it is a powerful technique and capable of producing high thrust, but this high thrust has a high energy cost when applied by sub-optimal fins and to high-drag scuba diving equipment, so it is often only used for short bursts ...
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Dolphin kick can be used with all fin types, and is the only option available when using a monofin. [ citation needed ] Modified styles of flutter and frog kick can be used to reduce down-flow of water which can disturb silt and reduce visibility, and are used when finning close to silty surfaces, such as inside caves and wrecks, or near the ...
This problem can be aggravated by cold water, stress, and strong water movement, and can be reduced by use of custom mouthpieces with longer and more rigid bite grip surfaces, which allow better support of the second stage with less effort. [46] Leg and foot cramps may be caused by unaccustomed exercise, cold, or ill-fitting fins. [citation needed]
The scope of this portal includes the technology supporting diving activities, the physiological and medical aspects of diving, the skills and procedures of diving and the training and registration of divers, underwater activities which are to some degree dependent on diving, economical, commercial, safety, and legal aspects of diving, biographical information on notable divers, inventors and ...
The vortex created by the tubercle delays flow separation toward the trailing edge of the wing, thus reducing the effects of drag. However, in water, due to the crest/trough structure, cavitation is possible, and is undesirable. Cavitation occurs in areas of high flow velocity and low pressure, such as the trough of a tubercled structure.