March 7th, 2008, 11:10 PM
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#18
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Moderator
Join Date: Dec 2004
Location: Arkansas
Posts: 5,184
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Quote:
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The picture is how I understand bullet ogive, from right to left as the bullet fattens, the ogive is the point where the bullet meets the caliper
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Not quite. The ogive is the curved part of the bullet.
Here is an explanation from Wikepedia..
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Quote:
In ballistics or aerodynamics, an ogive is a pointed, curved surface mainly used to form the approximately streamlined nose of a bullet, shell, missile or aircraft.
The traditional or secant ogive is a surface of revolution of the same curve that forms a Gothic arch; that is, a circular arc, of greater radius than the diameter of the cylindrical section ("shank"), is drawn from the edge of the shank until it intercepts the axis.
If this arc is drawn so that it meets the shank at zero angle (that is, the distance of the centre of the arc from the axis, plus the radius of the shank, equals the radius of the arc), then it is called a tangential or spitzer ogive. This is a very common ogive for high velocity (supersonic) rifle bullets.
The sharpness of this ogive is expressed by the ratio of its radius to the diameter of the cylinder; a value of one half being a hemispherical dome, and larger values being progressively more pointed. Values of 4 to 10 are commonly used in rifles, with 6 being the most common.
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Click on this link for the full explanation and a diagram of the ogive.
http://http://en.wikipedia.org/wiki/Ogive
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