The type of cast used when fishing varies according to the conditions. The most common cast is the forward cast, where the angler whisks the fly into the air, back over the shoulder until the line is nearly straight, then forward, using primarily the forearm. The objective of this motion is to "load" (bend) the rod tip with stored energy, then transmit that energy to the line, resulting in the fly line (and the attached fly) being cast for an appreciable distance. However, just bending the rod and releasing it to jerk the fly line forward (like a bowstring or a catapult) will not propel the fly line and fly very far. More important is the movement of the rod through an arc acting as a lever, magnifying the hand movement of the caster (of about a foot) to an arc at the rod tip of several feet. Here the rod acts as a lever. In fact, one of the Class 3 types of lever, where The force is applied between the fulcrum and the load (like tweezers). The fulcrum in the fly cast is below the caster's hand gripping the rod; the load is at the rod tip; between the hand exerts the force. The caster's "stroke" backwards and forwards, for the backcast and the forward cast, operates the rod as a (slightly flexible) lever. Casting without landing the fly on the water is known as 'false casting', and may be used to pay out line, to dry a soaked fly, or to reposition a cast. Other casts are the roll cast, the single- or double-haul, the tuck cast, and the side- or curve-cast.
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