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BC Calculator, Spitzer bullets
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Quantity in Basket:
None
Catalog No.: DC-1001
Price: $30.00
Shipping Weight: 0.10 pounds
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The DC-1001 BC Calculator program helps you design
tangential ogive (spitzer) bullets with flat, dish, cup,
hollow, boattail, or rebated boattail bases, with or
without jackets.
The program instantly calculates the BC (Ballistic
Coefficient), Ingall's number (form factor), sectional
density, minimum stable twist rate, bullet overall
length, shank length, base length, and ogive length,
as well as the average bullet density, given the basic
parameters of caliber, weight, core and jacket weight
(which self-correct to total bullet weight), material
density, and tip width (meplat).
The bullet parameters can be calculated with various
media density and at various velocities, going beyond
the usual, incorrect assumption that the BC will remain
the same regardless of speed. The program calculates
drag based on both ogive and base shape
(some BC programs ignore the base or handle it as a
constant), allowing you to compare the same bullet
design with boattail or rebated boattail base at
different velocities (for example) and with different
air densities. This lets you adjust the air density to
compensate for changes caused by altitude, barometric
pressure, temperature, and relative humidity.
You can save all the figures in a file by clicking a
button, and print either the saved info as a report,
or print the window just as it appears without saving
any data. Default values for standard air density and
standard velocity are restored with the click of a
button, so that it is easy to return to the
universally accepted comparision values.
The program also calculates kinetic parameters, such
as the kinetic energy, momentum, energy density at
impact, area of impact, and velocity in miles per
hour on a second window. These calculations may be
made without affecting the main window bullet design
(independent changes to caliber, weight, and velocity
are used to display the kinetic values).
The media density can include solids and liquids,
to establish spin rate for the bullet that would
maintain stability firing under water, or into
ballistic test materials. A drop-down list of
densities suggests values for a wide range of
materials, and the user can input any arbitrary
value within a broad range.
Values are tested and compared to logical limits,
so that values too far out of range to be of any
logical value are automatically reset to a standard,
with a warning notice. The program is useful for
subcalibers and airgun pellets as well as military
calibers such as the 1-inch cannon and 20mm anti-aircraft
projectile (as well as all standard small arms calibers). Ultra low drag designs can be calculated by using 14-S to 20-S ogive radius, and round nose bullets can be entered by using 0.5-S ogive radius. The increased BC achieved with sub-sonic velocity bullets equipped with boattail or rebated boattail bases is immediately apparent.
DC-1001 can be run from the CD-ROM (without
saving reports) or installed on your hard drive,
using the self-starting menu on the CD-ROM.
Just put the CD-ROM in your drive, and the menu
will appear (if your system has been set to allow
auto-start: otherwise, click CDM for CD Menu).
No technical expertise is required to calculate the
BC and other parameters for any spitzer bullet bullet!
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