Quick Answer
Using bark fiber for bowstrings is not recommended due to its relatively low tensile strength and high variability in quality.
Choosing the Right Bark Fiber
For a bowstring, you’ll want bark fibers with high tensile strength. Look for birch or willow bark, which typically have higher strength values than other types of bark. Birch bark has been reported to have a tensile strength of up to 2,000 pounds per square inch (psi), while willow bark can reach up to 1,500 psi.
Preparing the Bark Fiber
To prepare birch or willow bark for use as a bowstring, start by collecting the bark from a healthy tree and removing any loose or damaged areas. Split the bark into thin strips, about 1/4 inch wide, and cut them into lengths of 12-18 inches. Soak the strips in water for several hours to soften the fibers, then twist them together to create a single cord. Repeat this process multiple times, twisting the cords together to create the desired thickness and strength.
Spinning the Bowstring
Once you have your cord, it’s time to spin it into a bowstring. Hold the cord in both hands, with the ends facing away from you, and twist it clockwise to create a smooth, consistent texture. Use a drill or spindle to create a twisted rope, then wind the rope onto your bow. Finally, use a bowstring wax or beeswax to protect the cord and prevent it from drying out.
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