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Compound bows are designed with an off-center, pulley or cam mounted on each limb tip. The pulleys are designed and mounted so that the energy needed to pull back the bowstring is the greatest at mid-draw and the smallest at full-draw, this makes the aiming process a whole lot easier for the archer. When the string is released, this situation is reversed and the speed and energy of the arrow is increased. For example, a 60 pound bow of 50% reduction, holds only 30 pounds of resistance at full draw; 60 pounds of thrust, however, are imparted to the arrow.
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