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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
How important is bc?
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<blockquote data-quote="BryanLitz" data-source="post: 356962" data-attributes="member: 7848"><p>This is true, but not for the reason you described.</p><p></p><p>The boat tail isn't there to affect the shock wave, or skin friction. It's there to reduce the third component of projectile drag: base drag.</p><p></p><p>If the airflow separates off the bearing surface as in the case of a flat base, then the low pressure area (suction) behind the bullet applies to the full cross-sectional area of the bullet. However, with a boat tail, the airflow separates off a reduced diameter, so the low pressure applies to a smaller area, thus reducing base drag. </p><p></p><p>The mechanism described above applies pretty much the same at supersonic, transonic and subsonic speeds. The effect is reduced drag, which extends range. Boat tails aren't only effective at the end of the trajectory, they're effective for the entire trajectory, which extends the range.</p><p></p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 356962, member: 7848"] This is true, but not for the reason you described. The boat tail isn't there to affect the shock wave, or skin friction. It's there to reduce the third component of projectile drag: base drag. If the airflow separates off the bearing surface as in the case of a flat base, then the low pressure area (suction) behind the bullet applies to the full cross-sectional area of the bullet. However, with a boat tail, the airflow separates off a reduced diameter, so the low pressure applies to a smaller area, thus reducing base drag. The mechanism described above applies pretty much the same at supersonic, transonic and subsonic speeds. The effect is reduced drag, which extends range. Boat tails aren't only effective at the end of the trajectory, they're effective for the entire trajectory, which extends the range. -Bryan [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
How important is bc?
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