Strands/Strings

A bow string joins the two ends of the bow stave; it launches the arrow. Desirable properties include light weight, strength, resistance to abrasion, and resistance to water. more...

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Mass has most effect at the center of the string; one gram of extra mass in the middle of the string slows the arrow about as much as 3.5 grams at the ends. .

String forms

Most bow strings may be described as either simple, reverse-twisted, or looped.

Simple strings may be made of any fiber, twisted into a single cord. Such strings have been used in many parts of the world and are still effective and fairly quick to make. However, they tend to be weaker for their weight, and they may also come apart if not kept constantly under tension. They are normally secured to the bow by a knot at each end.

Reverse-twisted strings are traditional in Europe and North America for most natural materials. Linen and hemp fiber have been widely used. The form is also used for modern materials. A reverse-twisted string is made of separate bundles, each bundle individually twisted in one direction; the entire group of bundles is then twisted in the other direction. The result tends to be stronger for its weight than a simple or looped string, and holds together better than a simple string. A further advantage is that the full thickness of the string passes around the nocks, where wear is usually greatest. Additional threads may also be laid in at the nocking points for the bow stave and for the arrow, which are sites of likely wear. The string may be secured to the bow by a knot at each end, usually a timber hitch, also known as the bowyer's knot.

The traditional "Flemish" string has a laid-in loop at one end, which is easier than most knots to fit over the nock of the bow when stringing and unstringing. It is more trouble to make; the short length, towards one end, that will form the loop is reverse-twisted first. The ends of each bundle are then laid in to the main length of the bundles, which are reverse-twisted in turn. The Japanese bow string is made by reverse-twisting in different directions in the core and outer layers of the string.

Looped strings are made of one or more continuous loops of material. Modern strings are often made as a single continuous loop: this is then served to give the final form. Disadvantages include the lesser amount of fiber at the ends, where wear is most likely; this may be overcome by serving the string. In many parts of Asia, traditional strings have a single loop in the center, with the ends made of separate lengths tied on using a special knot. This design allows extra fiber to be used at the ends, where weight is less important and wear more likely.

Read more at Wikipedia.org