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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Sleepy Bullets VS Sleepy Arrows(Archery)
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<blockquote data-quote="Fiftydriver" data-source="post: 62009" data-attributes="member: 10"><p>A good example of this is proven with a childs toy TOP. When teh top is initially spun and dropped or placed in a hard surface, there is a wobble. What this wobble is, is the effects imparted on the top by the process used to accelerate its rotational velocity.</p><p></p><p>You will also notice that after just a second or so, the tops rotaion smooths up and spins almost like it is not rotating at all.</p><p></p><p>This is because the tops own inertia has taken over and faught off the effects of the intital spin acceleration. The top finds its gavitational center and rotates around that point very uniformly as long as the top is shaped correctly.</p><p></p><p>This is the same concept as what we see in bullets. The rifling is like the initial force that starts the top spinning at high rotaional speeds. The rifle does the same with the bullet.</p><p></p><p>When the top is free of this external force, it finds its center of gravity and rotates smoothly and evenly around this center of gravity.</p><p></p><p>The bullet, does the exact same thing. The center of gravity of the bullet will be different then the axial center of the bore. While the bullet is in the bore it has to rotate around the axial center of the bore simply because there is no where to go. </p><p></p><p>When the bullet is released by the muzzle, it initially wobbles just like the top does for a very short period of time. This is until the bullet finds its center of gravity and then will rotate cleanly around this point.</p><p></p><p>This is not a stability issue, it an issue concerned with a rotating projectile fighting off the forces that make the bullet rotate around the axial center of the bore and when released, it rotates around its own center of gravity.</p><p></p><p>In theory, out bullets and bore should have the same center of gravity, in reality, this is not the case and that is why it takes some distance for the bullet to "go to sleep".</p><p></p><p>Do not confuse this with a stability issue because it is not unless the bullet is not rotated fast enough. This is simply teh results of the rifling imposed onto the bullet and then the bullet shedding those forces and flying and rotating true to its center of gravity.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 62009, member: 10"] A good example of this is proven with a childs toy TOP. When teh top is initially spun and dropped or placed in a hard surface, there is a wobble. What this wobble is, is the effects imparted on the top by the process used to accelerate its rotational velocity. You will also notice that after just a second or so, the tops rotaion smooths up and spins almost like it is not rotating at all. This is because the tops own inertia has taken over and faught off the effects of the intital spin acceleration. The top finds its gavitational center and rotates around that point very uniformly as long as the top is shaped correctly. This is the same concept as what we see in bullets. The rifling is like the initial force that starts the top spinning at high rotaional speeds. The rifle does the same with the bullet. When the top is free of this external force, it finds its center of gravity and rotates smoothly and evenly around this center of gravity. The bullet, does the exact same thing. The center of gravity of the bullet will be different then the axial center of the bore. While the bullet is in the bore it has to rotate around the axial center of the bore simply because there is no where to go. When the bullet is released by the muzzle, it initially wobbles just like the top does for a very short period of time. This is until the bullet finds its center of gravity and then will rotate cleanly around this point. This is not a stability issue, it an issue concerned with a rotating projectile fighting off the forces that make the bullet rotate around the axial center of the bore and when released, it rotates around its own center of gravity. In theory, out bullets and bore should have the same center of gravity, in reality, this is not the case and that is why it takes some distance for the bullet to "go to sleep". Do not confuse this with a stability issue because it is not unless the bullet is not rotated fast enough. This is simply teh results of the rifling imposed onto the bullet and then the bullet shedding those forces and flying and rotating true to its center of gravity. Good Shooting!! Kirby Allen(50) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Sleepy Bullets VS Sleepy Arrows(Archery)
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