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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
how much does molly change the B.C of a bullet
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<blockquote data-quote="JBM" data-source="post: 35328" data-attributes="member: 1969"><p><BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR>I don't think dimples reduce golf ball drag, but instead, they increase it.</p><p>This causes the ball to curve upward due to it's backspin, raising the trajectory, and giving more 'airtime'(ie.distance).</p><p><HR></BLOCKQUOTE></p><p></p><p>The dimples keep the boundary layer from separating a little longer than if they weren't there. This reduces drag (reduces pressure from front back).</p><p></p><p>The curving is due to the magnus effect. Much larger force for golf balls than bullets (very different Reynolds numbers...)</p><p></p><p>As far as the roughness and rifling goes, these are way down in the boundary layer and don't really matter. Robert McCoy wrote to precision shooting about his a long time ago after someone had written an article "theorizing" that the rifling was causing some kind of inaccuracy.</p><p></p><p> <BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR></p><p>I'm sure that moly would be applied to fighter jets & rockets if it reduced drag. <HR></BLOCKQUOTE></p><p></p><p>Yep.</p></blockquote><p></p>
[QUOTE="JBM, post: 35328, member: 1969"] <BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR>I don't think dimples reduce golf ball drag, but instead, they increase it. This causes the ball to curve upward due to it's backspin, raising the trajectory, and giving more 'airtime'(ie.distance). <HR></BLOCKQUOTE> The dimples keep the boundary layer from separating a little longer than if they weren't there. This reduces drag (reduces pressure from front back). The curving is due to the magnus effect. Much larger force for golf balls than bullets (very different Reynolds numbers...) As far as the roughness and rifling goes, these are way down in the boundary layer and don't really matter. Robert McCoy wrote to precision shooting about his a long time ago after someone had written an article "theorizing" that the rifling was causing some kind of inaccuracy. <BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR> I'm sure that moly would be applied to fighter jets & rockets if it reduced drag. <HR></BLOCKQUOTE> Yep. [/QUOTE]
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how much does molly change the B.C of a bullet
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