An arrow's spine, a key characteristic influencing its flight, is "read" by understanding its spine size number. A smaller number indicates a stiffer arrow, while a larger number denotes a more flexible arrow.
Here's a breakdown:
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Spine Size Number: This number, usually ranging from 260 to 500 (but can vary outside these), indicates the arrow's stiffness or spine.
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Stiffer Spine (Lower Number): An arrow with a lower spine number (e.g., 340) is stiffer and heavier. This means it bends less upon release. These are generally used with heavier draw weights.
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More Flexible Spine (Higher Number): An arrow with a higher spine number (e.g., 500) is more flexible and lighter. It bends more easily upon release. These are generally used with lighter draw weights.
In summary:
| Spine Size Number | Spine Stiffness | Usage |
|---|---|---|
| Lower (e.g., 340) | Stiffer | Heavier draw weights, less bending |
| Higher (e.g., 500) | More Flexible | Lighter draw weights, more bending |
Choosing the correct arrow spine is crucial for accurate shooting. It's essential to match the arrow's spine to your bow's draw weight and your draw length to ensure the arrow flexes correctly during launch, leading to consistent and accurate shots. Consult an archery expert or spine charts for proper arrow selection.
