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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
BALLISTIC COEFFICIENTS/Twist Rates
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<blockquote data-quote="BryanLitz" data-source="post: 417619" data-attributes="member: 7848"><p>Spinning a bullet faster DOES NOT result in more of a 'nose-up' attitude, and no lift is generated in the vertical plane.</p><p></p><p>Rather, the yaw of repose (in the horizontal plane) will be greater and the faster spinning bullet will have more spin drift (to the side).</p><p></p><p>This behavior has been studied, modeled, and reported in this document:</p><p><a href="http://appliedballisticsllc.com/index_files/HATS_Report.pdf" target="_blank">http://appliedballisticsllc.com/index_files/HATS_Report.pdf</a></p><p></p><p>I'm curious to hear about your methods of determining BC for the 3 barrels. </p><p></p><p>I'm not saying the results aren't real, I just don't think they're due to a nose high flight orientation. Induced drag from excessive pitching/yawing motion may be less for a faster twist barrel, but that would only affect the first ~100 yards of flight. Or, the faster twist barrels may be 'smoother', leaving the bullet surface more 'slippery' somehow.</p><p></p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 417619, member: 7848"] Spinning a bullet faster DOES NOT result in more of a 'nose-up' attitude, and no lift is generated in the vertical plane. Rather, the yaw of repose (in the horizontal plane) will be greater and the faster spinning bullet will have more spin drift (to the side). This behavior has been studied, modeled, and reported in this document: [url]http://appliedballisticsllc.com/index_files/HATS_Report.pdf[/url] I'm curious to hear about your methods of determining BC for the 3 barrels. I'm not saying the results aren't real, I just don't think they're due to a nose high flight orientation. Induced drag from excessive pitching/yawing motion may be less for a faster twist barrel, but that would only affect the first ~100 yards of flight. Or, the faster twist barrels may be 'smoother', leaving the bullet surface more 'slippery' somehow. -Bryan [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
BALLISTIC COEFFICIENTS/Twist Rates
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