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A primitive bow can achieve draw weights significantly beyond what is typically associated with traditional archery, with some examples reaching draw weights of 70-80 pounds or more. This is particularly true for well-made bows crafted from high-strength staves and employing techniques like sinew backing.
Choosing the Right Stave
Selecting a suitable stave is crucial for crafting a high-performance primitive bow. Look for staves with a straight grain pattern, a clear heartwood to sapwood boundary, and a thickness of about 1.5 to 2 inches (38-51 mm). Staves with a diameter of 1 inch (25 mm) or more can support higher draw weights. For example, a stave measuring 1.5 inches (38 mm) in diameter and 60 inches (152 cm) long can produce a bow with a draw weight of 70 pounds (31.8 kg) or more, assuming optimal tillering and sinew backing.
Tillering and Sinew Backing
Effective tillering can significantly increase a bow’s draw weight. Aim to reduce the bow’s weight by about 20-30% through careful tillering, while maintaining its overall shape and dimensions. Sinew backing can provide an additional 10-20% increase in draw weight. To achieve this, apply multiple layers of sinew to the bow’s back, securing each layer with additional sinew or cordage. For example, applying six to eight layers of sinew, each 0.1 inches (2.5 mm) thick, can add an extra 10-20 pounds (4.5-9 kg) to a bow’s draw weight.
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