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Bowstring

technology Maturity 11-13 Next article →

A bowstring is a very important part of a bow. It joins the two ends of the bow stave together. This connection helps launch the arrow when the bow is pulled. A good string needs a few special qualities to work well. It must be light and very strong. It also needs to resist abrasion, which is wear from rubbing.

Tsurumaki string holder 1
Tsurumaki string holder 1

The weight of the string matters a lot. Extra mass in the middle of the string slows the arrow down. This happens even if the extra weight is at the ends.

There are different ways to build a string. A simple string is made by twisting a single fiber into a cord. These are quick to make but can be weak. They might also come apart if they are not kept under tension.

Turkish bow knot by Tirion Keatinge
Turkish bow knot by Tirion Keatinge

A reverse-twisted string is much stronger for its weight. To make it, you twist separate bundles in one direction. Then, you twist the whole group in the other direction. This helps the string hold together better than a simple cord.

People have used many different materials for strings throughout history. Traditional materials include linen, hemp, silk, and even animal hair. Some people used sinew or rawhide for their strings.

Turkish bow knot by Tirion Keatinge
Turkish bow knot by Tirion Keatinge

These natural materials can be changed by water. Water can make sinew or hide strings stretch or break. One old story tells of how wet bowstrings can fail during a fight. Some traditions even suggest using the hide of a young camel.

Modern science has created much stronger materials for archers to use. Dacron is a common polyester used for beginners. It has a stretch of 2.6% and is very durable. This stretch helps protect wooden bows from shock. Other materials like Kevlar and Vectran are very dense. They have a low stretch of only 0.8%. Using these materials can make an arrow fly much faster.

Turkish bow knot by Tirion Keatinge
Turkish bow knot by Tirion Keatinge

Since the 1990s, people have also used polyethylenes like Spectra and Dyneema.

To make strings last longer, makers use a method called serving. Serving means wrapping an extra thread around the main string. This is done at the nocking points where the string rubs most.

Tsurumaki string holder 1
Tsurumaki string holder 1

This extra layer protects the string from wearing down. It is also used on looped strings to keep them together. On compound bows, serving is used on cables too. It protects the parts that touch the cams or roller guards. This helps the equipment stay in good shape for a long time.

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File:Tsurumaki string holder 1.JPG
Tsurumaki string holder 1.JPG
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Turkish bow knot by Tirion Keatinge.PNG
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