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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Parabolic Drag
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<blockquote data-quote="Hugnot" data-source="post: 2600991" data-attributes="member: 115658"><p>My thinking is for airfoils a composite drag chart would look like a parabola should the parasitic drag increase with speed and the lift drag decrease with speed, The X axis being speed, the Y axis being drag. Sort of like 2 sloping curved lines having a parabolic shaped composite line above.</p><p></p><p>For spinning bullets subject to slowing down and yawing and precession effects. As the velocity decreases the parasitic drag would decrease but the effects of spinning causing yawing and precession would remain constant or greater making the 2nd drag effect greater.. Sort of like 2 sloping curved lines one being curved down as the parasitic drag decreased but the other line would sloping up as yawiing or precession increased. A composite graph of both would look like a parabola.</p><p></p><p>This assumes bullet yaw or precession effects would increase??</p><p></p><p>Some think anular bullet grooves reduce flying bullet skin friction. Land engraving might also affect skin friction. Math/physics guys get into boundary layers & Reynold's numbers to describe this stuff.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2600991, member: 115658"] My thinking is for airfoils a composite drag chart would look like a parabola should the parasitic drag increase with speed and the lift drag decrease with speed, The X axis being speed, the Y axis being drag. Sort of like 2 sloping curved lines having a parabolic shaped composite line above. For spinning bullets subject to slowing down and yawing and precession effects. As the velocity decreases the parasitic drag would decrease but the effects of spinning causing yawing and precession would remain constant or greater making the 2nd drag effect greater.. Sort of like 2 sloping curved lines one being curved down as the parasitic drag decreased but the other line would sloping up as yawiing or precession increased. A composite graph of both would look like a parabola. This assumes bullet yaw or precession effects would increase?? Some think anular bullet grooves reduce flying bullet skin friction. Land engraving might also affect skin friction. Math/physics guys get into boundary layers & Reynold's numbers to describe this stuff. [/QUOTE]
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Parabolic Drag
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