Why the wrong arrow spine could be dangerous to your hands
In short: Selecting an arrow involves more than just matching its length to your draw. If the stiffness, or spine, is mismatched to your bow's poundage, you risk more than just poor accuracy. A poorly chosen arrow can bend excessively upon release, potentially shattering and driving broken fragments into your hand.
In archery, the term 'spine' refers to an arrow's ability to bend. This flexibility is not random; it is determined by a combination of the arrow's diameter and the thickness of its walls. While archers can choose from various materials—including wood, aluminum, carbon, and fiberglass—the physical dimensions of the shaft are what dictate its structural response to the bow's energy. The variety of available materials, such as wood, aluminum, carbon, and fiberglass, allows for different structural properties across various arrow types.
To select the correct equipment, an archer must identify two critical variables: the poundage of the bow and the final length of the arrow once it has been cut to the user's draw length. These two measurements are the foundation of the selection process. Using these figures, archers can consult specific selection charts provided by manufacturers to find the precise spine required for their setup. Every major brand-name manufacturer publishes their own specific arrow selection charts to assist with this calculation.
The consequences of ignoring these charts are twofold. First, there is a significant loss of precision. The more an arrow bends as it travels through the air, the less accurate its flight becomes. The goal is to achieve a spine that allows the arrow to travel in a perfectly straight line immediately after passing through the bow. Second, there is a serious safety risk. If an arrow is too weak for a heavy bow, the excessive bending can cause the shaft to break, potentially causing injury to the archer's hand. An arrow that is too weak for the bow's power will bend too much during the shot.
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Sources
- Summary by Intellect · source: How to Pick a Proper Spined Arrow | Archery Lessons
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