What is the difference between Secant and tangent ogive?
A Tangent Ogive (like our standard BTs) is less sensitive to seating depth but has more drag and a lower BC than a Secant Ogive of the same length. A Secant Ogive (like our standard VLDS) has a higher BC and lower drag than a traditional Tangent Ogive but can be quite sensitive to seating depth.
What is Secant ogive?
A secant ogive is an ogive that tapers more gradually relative to its length than does the tangent ogive and touches the curve at two places, which provides a higher Ballistic Coefficient (BC) and less drag.
What is VLD Secant?
Background. VLD bullets are designed with a secant ogive. This ogive shape allows bullets to be more efficient in flight (retain more velocity = less drop and wind deflection). While this result is desirable for many rifle shooters the secant ogive on the VLD bullets produces another result in many rifles.
What is a bullet ogive?
But what is an ogive profile? Simply defined, it’s the curved portion of a bullet forward of the bearing surface. Because a flat cylinder is undesirable for exterior ballistic reasons, rifle bullets have on of three ogives or “point profiles”: flat nose (FN), round nose (RN) or pointed (spitzer).
Is Secant line the same as tangent?
A secant line is a straight line joining two points on a function. A tangent line is a straight line that touches a function at only one point. (See above.) The tangent line represents the instantaneous rate of change of the function at that one point.
What does VLD mean in ammo?
very-low-drag bullet
A very-low-drag bullet (VLD) is primarily a small arms ballistics development of the 1980s–1990s, driven by shooters’ desire for bullets with higher degrees of accuracy and kinetic efficiency, especially at extended ranges. To achieve this, the projectile must minimize air resistance in flight.
What is CBTO in reloading?
CBTO (Cartridge Base To Ogive) is the measurement of a cartridge from the ogive of the bullet to the base of the cartridge length. This measurement is used when you are doing bullet seating depth testing: https://bergerbullets.com/vld-making-shoot/
What is secant and tangent line?
Secant line is one that intersects two points in a line, whereas tangent line intersects exactly one point on the curve.
Are secant and chord the same?
A straight line that intersects a circle in two points is called a secant line. A chord is the line segment that joins two distinct points of the circle.
What is the difference between a secant line and a tangent line?
The secant line is the red line to the right that passes through two points on the curve. The tangent line is the green line that just grazes the curve at a point. For the function f (x) = x2 – 2x + 3, answer each of the questions below.
What happens when you move away from a tangent?
As you move farther away from the tangent or secant lines, distortion increases. As you move farther away from the tangent or the secants in either a northerly or southerly direction, distortion increases. For a tangent map projection, this places the center of the map on a line that does not exhibit any distortion.
What do you call two secants on a map?
If there are two such lines, they are called secants. The contact point (or points) between the spheroidal earth’s surface and the plane of the map projection is the only location where the properties of the projection are true.
How to determine the limit of a secant line?
Let Dx represent the distant between the two points along the x-axis and determine the limit as Dx approaches zero. As the two points used for the secant line get closer to one another, the average rate of change becomes the instantaneous rate of change and the secant line becomes the tangent line.