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Long Range Hunting & Shooting
twist rate
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<blockquote data-quote="Dave King" data-source="post: 1067" data-attributes="member: 3"><p>"The length and weight of a bullet are not the determining factors in gyroscopic stability. It is the relationship between the center of reverse air pressure under the ogive and the center of mass. The actual equation is fairly complex. The greater the distance between these two the faster the twist(spin) needed to keep it pointed nose forward. "</p><p></p><p></p><p>Warren, I love it when you talk like that!!</p><p></p><p>In my mind's eye I always equated the twist rate required as a function of length as I imagined trying to spin a squatty toy top in comparison to a #2 Lead Pencil. The spin required for this is that required to overcome only gravity. I never gave too much thought to the pressure caused by the bullet flying through air. Good thing I'm not a rocket scientist!!</p><p></p><p>rufous</p><p></p><p> I think the board requires the cant because many bones a round(ed), not flat. It'd be more common to bit a bone off-center than directly at 90 degrees to the flight of the bullet.</p></blockquote><p></p>
[QUOTE="Dave King, post: 1067, member: 3"] "The length and weight of a bullet are not the determining factors in gyroscopic stability. It is the relationship between the center of reverse air pressure under the ogive and the center of mass. The actual equation is fairly complex. The greater the distance between these two the faster the twist(spin) needed to keep it pointed nose forward. " Warren, I love it when you talk like that!! In my mind's eye I always equated the twist rate required as a function of length as I imagined trying to spin a squatty toy top in comparison to a #2 Lead Pencil. The spin required for this is that required to overcome only gravity. I never gave too much thought to the pressure caused by the bullet flying through air. Good thing I'm not a rocket scientist!! rufous I think the board requires the cant because many bones a round(ed), not flat. It'd be more common to bit a bone off-center than directly at 90 degrees to the flight of the bullet. [/QUOTE]
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