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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
velocity in relation to barrle twist
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<blockquote data-quote="dwm" data-source="post: 31285" data-attributes="member: 1136"><p>Ok, so how does a gain twist barrel work in this very interesting model?</p><p></p><p>Also, a bullet will gyroscopically stablize when stood on end on the floor and spun like a top. All those stability equations apply. No forward velocity at all. So much for stability vs forward velocity. <img src="http://images/icons/blush.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p>But what about stability vs RPM? No revolutions or RPM, no stability, right? Top falls over when RPM approach zero. But forward velocity and RPM are linked together by the twist rate. Man this just keeps on going around in circles. I'm getting dizzy.</p><p></p><p>The RPM vs forward velocity thing was very enlightening. As forward velocity increases so does RPM, but strangely enough the bullet still turns 1 revolution in x inches no matter what the forward velocity is. It is fixed by the twist rate. (Ouch, <img src="http://images/icons/shocked.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://images/icons/shocked.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://images/icons/smile.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> )</p><p></p><p>Thanks, <img src="http://images/icons/rolleyes.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p>Doug</p><p></p><p>I am beginning to think all barrels should be gain twist.</p><p></p><p>By the way, I do have McCoy's book.</p><p></p><p>[ 02-09-2004: Message edited by: dwm ]</p></blockquote><p></p>
[QUOTE="dwm, post: 31285, member: 1136"] Ok, so how does a gain twist barrel work in this very interesting model? Also, a bullet will gyroscopically stablize when stood on end on the floor and spun like a top. All those stability equations apply. No forward velocity at all. So much for stability vs forward velocity. [img]images/icons/blush.gif[/img] But what about stability vs RPM? No revolutions or RPM, no stability, right? Top falls over when RPM approach zero. But forward velocity and RPM are linked together by the twist rate. Man this just keeps on going around in circles. I'm getting dizzy. The RPM vs forward velocity thing was very enlightening. As forward velocity increases so does RPM, but strangely enough the bullet still turns 1 revolution in x inches no matter what the forward velocity is. It is fixed by the twist rate. (Ouch, [img]images/icons/shocked.gif[/img] [img]images/icons/shocked.gif[/img] [img]images/icons/smile.gif[/img] ) Thanks, [img]images/icons/rolleyes.gif[/img] Doug I am beginning to think all barrels should be gain twist. By the way, I do have McCoy's book. [ 02-09-2004: Message edited by: dwm ] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
velocity in relation to barrle twist
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