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Do Bullets Go To Sleep?
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<blockquote data-quote="Michael Courtney" data-source="post: 778111" data-attributes="member: 28191"><p>This is a great question that shines light on two possible meanings of bullets going to sleep. If "going to sleep" means damping of pitch and yaw, then yes, bullets do go to sleep. If "going to sleep" means smaller angular groups at longer range because of this damping, then it probably does not happen. See the Litz article: <a href="http://www.appliedballisticsllc.com/index_files/epswerve.html" target="_blank">Epicyclic Swerve</a></p><p></p><p>However, saying that it probably does not happen because it's been looked for carefully under various conditions without finding it does not prove that it NEVER happens. We need to acknowledge that there might be some combination of rifle and bullet and load out there somewhere that really does demonstrate reduced angular dispersion at longer ranges. It is just that the effect has not been carefully documented in a manner sufficiently convincing that it could be attributed to damping of pitch and yaw rather than some other confounding factor. </p><p></p><p>In summary:</p><p></p><p>1. Bullets can have considerable pitch and yaw when they leave the barrel</p><p>2. This pitch and yaw increases drag</p><p>3. The pitch and yaw are damped out in flight and the drag is thus decreased</p><p>4. The effects on trajectory are too small to cause a reduction in angular dispersion with range</p></blockquote><p></p>
[QUOTE="Michael Courtney, post: 778111, member: 28191"] This is a great question that shines light on two possible meanings of bullets going to sleep. If "going to sleep" means damping of pitch and yaw, then yes, bullets do go to sleep. If "going to sleep" means smaller angular groups at longer range because of this damping, then it probably does not happen. See the Litz article: [url=http://www.appliedballisticsllc.com/index_files/epswerve.html]Epicyclic Swerve[/url] However, saying that it probably does not happen because it's been looked for carefully under various conditions without finding it does not prove that it NEVER happens. We need to acknowledge that there might be some combination of rifle and bullet and load out there somewhere that really does demonstrate reduced angular dispersion at longer ranges. It is just that the effect has not been carefully documented in a manner sufficiently convincing that it could be attributed to damping of pitch and yaw rather than some other confounding factor. In summary: 1. Bullets can have considerable pitch and yaw when they leave the barrel 2. This pitch and yaw increases drag 3. The pitch and yaw are damped out in flight and the drag is thus decreased 4. The effects on trajectory are too small to cause a reduction in angular dispersion with range [/QUOTE]
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