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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Drag Function question.
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<blockquote data-quote="Blaine Fields" data-source="post: 32252" data-attributes="member: 183"><p>My main complaints about using multiple BCs to deal with drag functions are two: first, it is not obvious what the multiple BCs should be nor the boundaries for each. Second, each change of BC introduces a discontinuity into the output.</p><p></p><p>A BC is supposed to be a scaling factor so that the same function can be used for a variety of bullets. If we are stuck with G1 based BCs, but the G1 drag model predicts less drag than occurs in reality (as does the G1 function for small arm prjectiles at velocities under 2500 fps), then one solution is to mathematically account for increasing drag experienced by small arms projectiles as they slow and to permit the shooter to adjust the slope of the drag curve. That way, a single G1-based BC can be used and the shape of the curve can be tweaked to match actual performace of the bullet in question.</p></blockquote><p></p>
[QUOTE="Blaine Fields, post: 32252, member: 183"] My main complaints about using multiple BCs to deal with drag functions are two: first, it is not obvious what the multiple BCs should be nor the boundaries for each. Second, each change of BC introduces a discontinuity into the output. A BC is supposed to be a scaling factor so that the same function can be used for a variety of bullets. If we are stuck with G1 based BCs, but the G1 drag model predicts less drag than occurs in reality (as does the G1 function for small arm prjectiles at velocities under 2500 fps), then one solution is to mathematically account for increasing drag experienced by small arms projectiles as they slow and to permit the shooter to adjust the slope of the drag curve. That way, a single G1-based BC can be used and the shape of the curve can be tweaked to match actual performace of the bullet in question. [/QUOTE]
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Drag Function question.
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