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T-PLOT Ballistic Plotter
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Quantity in Basket:
None
Catalog No.: DC-1004
Price: $30.00
Shipping Weight: 0.10 pounds
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The DC-1004 program helps you design and compare
bullet flight performance, while also calculating the
maximum vertical height to which the bullet rises with
a given muzzle velocity, and the terminal energy and
velocity of the same bullet when it strikes the ground.
The program asks you for the caliber, bullet weight,
and ogive shape, as well as the meplat (nose width at
the tip). It allows you to enter various media densities,
such as dry air at sea level or any other combination
of moisture and elevation as expressed in air density,
so you can compare the performance at different
elevations, barometric pressures, and with different
humidity levels.
The program lets you tailor the sampling rate for the
reiterative air resistance calculations, from
0.001 seconds to 0.1 seconds, to trade calculation
speed for higher graphic resolution.
A graph with the y-axis equal to velocity, and the
x-axis equal to time of flight, is produced for your
bullet design, and can be viewed or printed with or
without specific figures for any given point on the
graph. The display of detailed parameters can be
removed from the graph by clicking anywhere within
the blank space of the answer box, in case the
graph line should be partly covered by the answer box.
The maximum y-axis height can be entered, to change
the part of the graph displayed or zoom in on a
portion of the curve.
The point at which the measurements are taken,
in terms of time of flight, can also be selected.
Answers include the maximum height of the bullet,
the BC, Ingall's number (form factor), kinetic energy
and velocity of the bullet at the point of measurement,
the total time of flight to reach zero velocity, and
the drop figures of terminal velocity, terminal energy,
and drop time. These drop figures are those which result
from dropping the bullet from its maximum vertical height, which in turn depends partly on the initial velocity, BC, and air density.
The DC-1004 Terminal Plotter uses a different approach to
calculating drag and BC, in that the figures are
recalculated at the sampling rate desired from 1 to
100 milliseconds, starting with the last velocity and
reducing it by the acceleration of gravity for the
sampling time period, then applying the G2 ballistic
calculations for the physical parameters of the bullet
adjusted for the new starting velocity and air density.
The ending velocity is then used as the starting
velocity for the next loop of calculations, in a
dynamic calculus of the air resistance and resulting BC.
The BC then figures into the retardation of the bullet,
and is updated in the next sampling.
The program provides a drop down chart of various air
densities for dry air at different temperatures, and
other gasses such as nitrogen, liquids (water), and
solids (ice, ballistic media, wax). Detailed help for
the drop down chart and a pop-up window for the
sampling interval entry assist the user in
understanding the effect of his choices on the answers
and the graph. Using the DC-1004 program as a
graphic comparison tool for various bullet designs
enables the bullet maker to show clients exactly what
differences may occur as a result of subtle design
differences.
The program also lets the user select distance in yards
or feet, and the kind of base design can be selected
and changed instantly from flat to boattail to
rebated boattail. A fourth choice is the ULD option,
which means ultra low drag design. Clicking this
button changes the ogive curve and the tip or
meplat as well as the base to conform to Corbin's
ULD standard. This gives you a fast way to compare
the highest efficiency bullet shape in any weight
and caliber with the standard shapes, or any other
shapes you wish to compare.
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