Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
bullet twist rates over velocity?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Richard338" data-source="post: 36577" data-attributes="member: 1537"><p>If there is an imperfection in the bullet, then there can be two types of imbalance, static, and dynamic. </p><p>Imagine a perfect bullet, then imagine adding a small lump of mass near the front, on the left side. Add another at the back, also on the left side. This is statically imbalanced, you can detect it while the bullet is motionless. If you rotate the bullet on its axis, it will be heavier on the side where the extra masses are. The axis that the bore forces the bullet to rotate around does not pass through the center of mass. Once free of the bore the bullet flies off it's path slightly. </p><p></p><p>Dynamic imbalance occurs if the mass at the back were on the right side, then it would counter the mass at the front during static measurements. Once the bullet is spinning fast, the mass at the front would pull opposite to that at the back. This twists the bullet from flying straight along its trajectory.</p><p></p><p>Both effects are bad for accuracy. The different densities of copper and lead, and any deformation of the core and jacket cause these imbalances.</p></blockquote><p></p>
[QUOTE="Richard338, post: 36577, member: 1537"] If there is an imperfection in the bullet, then there can be two types of imbalance, static, and dynamic. Imagine a perfect bullet, then imagine adding a small lump of mass near the front, on the left side. Add another at the back, also on the left side. This is statically imbalanced, you can detect it while the bullet is motionless. If you rotate the bullet on its axis, it will be heavier on the side where the extra masses are. The axis that the bore forces the bullet to rotate around does not pass through the center of mass. Once free of the bore the bullet flies off it's path slightly. Dynamic imbalance occurs if the mass at the back were on the right side, then it would counter the mass at the front during static measurements. Once the bullet is spinning fast, the mass at the front would pull opposite to that at the back. This twists the bullet from flying straight along its trajectory. Both effects are bad for accuracy. The different densities of copper and lead, and any deformation of the core and jacket cause these imbalances. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
bullet twist rates over velocity?
Top