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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
wind drift based on drag
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<blockquote data-quote="Mikecr" data-source="post: 665677" data-attributes="member: 1521"><p>To me there seems something missing in the time lag rule of thumb(as applied/described).</p><p>The T-Lag formula implies to me that drift takes affect ONLY during SLOWING of an object.</p><p>And slowing of the object in my understanding is purely due to drag.</p><p>Maybe if I could see an ACTUAL drag curve of a bullet, instead of a drag coefficient curve..</p><p></p><p>This is why a faster/lighter/lower BC bullet producing lower wind drift doesn't make sense to me:</p><p>Drag is not drag coefficient. Right?</p><p>That is, there is drag, which goes UP with any object considerably with velocity. And then there is an object specific aerodynamic adjustment applied to drag (it's coefficient).</p><p>I would think that regardless of the coefficient applied(which should be relatively small), actual/total drag would still continue to climb with velocity.</p><p>So,,</p><p>If drag does continue to climb with velocity, then at any given span in a bullet's flight, T-Lag would follow the bullet's slowing rate -due to drag within that span.</p><p>For example, when measuring a bullet's drop in velocity between 50yds and 100yds, I should get a higher rate of velocity loss than the same measure between 950yds and 1Kyds,, this because of different drag rates(slowing rates).</p><p>And with this, the T-Lag should be higher at 50-100, than at 950-1000. </p><p>So a 10mph wind applied to both equally should cause more drift/deviation(in moa) at the 50-100 span, even though there was less TOF there, than at the 950-1000 span.</p><p></p><p>Coefficients aside,,</p><p>Do lighter bullets cause less drag?</p><p>Do they cause less drag due to smaller diameter?</p><p>What if they are the same diameter, but lighter?</p><p>Does higher velocity of this lighter bullet mean higher total drag?</p><p>Does higher total drag mean greater slowing rate and therefore higher T-Lag?</p><p></p><p>Not trying to hijack the thread, but to lead into an understanding that might help.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 665677, member: 1521"] To me there seems something missing in the time lag rule of thumb(as applied/described). The T-Lag formula implies to me that drift takes affect ONLY during SLOWING of an object. And slowing of the object in my understanding is purely due to drag. Maybe if I could see an ACTUAL drag curve of a bullet, instead of a drag coefficient curve.. This is why a faster/lighter/lower BC bullet producing lower wind drift doesn't make sense to me: Drag is not drag coefficient. Right? That is, there is drag, which goes UP with any object considerably with velocity. And then there is an object specific aerodynamic adjustment applied to drag (it's coefficient). I would think that regardless of the coefficient applied(which should be relatively small), actual/total drag would still continue to climb with velocity. So,, If drag does continue to climb with velocity, then at any given span in a bullet's flight, T-Lag would follow the bullet's slowing rate -due to drag within that span. For example, when measuring a bullet's drop in velocity between 50yds and 100yds, I should get a higher rate of velocity loss than the same measure between 950yds and 1Kyds,, this because of different drag rates(slowing rates). And with this, the T-Lag should be higher at 50-100, than at 950-1000. So a 10mph wind applied to both equally should cause more drift/deviation(in moa) at the 50-100 span, even though there was less TOF there, than at the 950-1000 span. Coefficients aside,, Do lighter bullets cause less drag? Do they cause less drag due to smaller diameter? What if they are the same diameter, but lighter? Does higher velocity of this lighter bullet mean higher total drag? Does higher total drag mean greater slowing rate and therefore higher T-Lag? Not trying to hijack the thread, but to lead into an understanding that might help. [/QUOTE]
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wind drift based on drag
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