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Maximizing the downward thrust of the quadriceps (the largest muscles in the body) and minimizing the return kick effort needed by the less powerful calf and hamstring groups, is the essence of the biomechanical engineering of the V-Drive fin. The opening and closing of the 'V' through the kick cycle is called variable thrust, and it is directly proportional to the strength applied ... that is. the expansion and contraction of the 'V' blade is heightened as the force of the kick increases. The effect of variable surface biomechanics is more speed and control in every situation. A set of raised hydrodynamic ribs at the top sides of each blade help stabilize and reduce the flow of water off each side of the blade. The flow of water off the side of a fin is called "wake drag" and it reduces the size and thrust of the water column being pushed down to the end of the blade. Eliminating wake drag means more power with less fatigue. The absence of ribs on the bottom of the fin allows water to slip off the side for minimum upstroke resistance. The V-Drive is constructed of a resilient, lightweight thermoplastic. The blade is actually built into the arch, running underneath from the sole to the heel. The foot pocket is soft and comfortable. This softer thermoplastic features a tread that improves traction. The fin's quick release buckles are easily adjusted even with thick neoprene glove.
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