My Shareware
Group Size Calculator (GSC V2.4)
This program can be used to calculate some group statistics of a number of shots
fired on a target. If you have a scanner available to you, it makes it very
easy to capture the X-Y locations of your shots simply by opening a scanned
image of your target and clicking on the bullet holes! Alternately, you can
measure your shots with a caliper, enter the X-Y locations of each of the
shots into a text file, and feed this file into the GSC to get the group's
statistics. The GSC provides the following information for the group:
- Group Center
- Group Size - largest distance between the centers of any two shots.
- Mean Average Distribution - the "standard deviation" of the group
- Average Radius - average distance of the shots from the center of the group. I
believe this, when used with the Radius Standard Deviation, to be the
best measure of how well a particular load/gun shoots.
- Radius Standard Deviation - statistical measure of the distribution of radaii.
You can also selectively mark shots as "fliers". These will then be removed from
the calculations.
The program is written for the Windows95/98/2000/XP environment. It has not been
tested and may not work with Windows 3.1. It has been developed
using Visual Basic 6. There may be some problems installing this on a system
with VB5.
You may download,
install and try the program for free, however some features are disabled until you
register your copy (registration information included in the program; registration fee
$10 in U.S. funds).
Trajectory Plot V3.0 (External Ballistics Calculator)
Based on the Gavre (G1) functions as
described in Hatcher's Notebook (chapter XXIII),
this program calculates the trajectory of bullets along a flight path.
This program deals with exterior ballistics only - that is, the path
of a bullet after it has exited the muzzle of a firearm.
Since one often works up loads and practices with firearms in moderate
to warm conditions at relatively low altitudes, and then hunts in typically
much colder temperatures, and sometimes at high altitudes,
this program is designed to help one in predicting the field results based on
range observations. Looking at it another way, this allows one to
define the desired field results and then learn how to adjust the
firearm under range conditions in order to obtain those desired field
results.
Caution: Exterior ballistics is not an exact science.
Wind drag is a long studied effect, yet has proven itself to be (so far)
impossible to describe in a single, definitive formula,
especially around the speed of sound. Hence, the trajectories presented
by any source are at best an approximation.
Most programs/books are based on table look-up routines. This program
uses the Gavre functions to calculate the deceleration of a
bullet over it's flight.
In it's simplest form, given a bullet, it's muzzle velocity, the
"scope height" of the gun, the
environmental conditions, and the desired radius within which one desires
the bullet to remain, the program calculates and displays the
bullet's trajectory, the maximum point-blank-range, and the bullet's
"drop" at 25, 50 and 100 yards.
Other features of this program:
- In addition to the Gavre (G1) drag curve, the G7 (preferred for boat-tail bullets),
G2, G5, G6, G8, Krupp, and modified Mayevski drag functions are selectable.
- Independent environmental conditions can be specified for the range
and the field.
- Tail and cross wind can be specified.
- Bullet drop and energy are displayed in graphical and (optionally)
tabular form.
- Using the mouse, bullet drop, velocity, and energy for any downrange distance
is calculated and displayed.
- Wind deflection information is available.
- A "target view" can be displayed for any distance down-range.
- Uphill or downhill line-of-sight can be specified.
- Close to 950 bullets from Barnes, Hornady, Nosler, Sierra, Speer, and Woodleigh
are preloaded into the program, with the
ability of the user to add, delete, or modify the list.
- Familiar drop tables or point-blank-range methods of plotting
the trajectory may be specified.
- In addition to point-blank-range specification and standard drop tables
is a "varmint" mode of operation wherebye you can specify the
"dead zero" range and observe the path of the bullet.
- A simple to use graphical aid tool is provided to calculate tail
and cross wind components based on wind speed and direction.
- A separate muzzle velocity calculator is provided to estimate
the muzzle velocity at temperatures other than when cronographed.
The program is written for the Windows XP/W7 environment. Windows 95 and 98 are
no longer supported with new features. An archived version is still available.
It has been developed using Visual Basic 6. You may download,
install and try the program for free, however some features are disabled until you
register your copy (registration information included in the program; registration fee
$10 in U.S. funds).
Bullseye Range Command Controller V2.8
 |
This program contains all the Precision Pistol range commands and sequences to run:
- a traditional "900" match
- a National Match Course
- the P100 course of fire
- International Center Fire Pistol match
- International Standard Pistol match
- International Rapid Fire match
- "Zombie shoot" match (Duello)
If a USB controlled SPST switch is attached to your PC, this can control the turning of targets during timed
and rapid fire (and slow fire if range applicable).
More info on the Bullsye Controller
Download V2.8 here
|
miniScarab6+ Programming Tool V2.0
Financial Amortization Calculator - V2.3
Here's a simple program that will calculate montly payments, interest rate, number of
payments, or affordable principle given the other parameters. You can specify any
three of these variables and ask the calculator to determine the fourth. Additionally,
it will calculate the remaining principle after a specified number of payments. All calculations
are based on "simple interest" calculations (that used for most home mortgages). It does
not use the "rule of 78s" that is common among car loans.
Versions V2.0 and later include what I've called a Uniform Draw-Down Calculator. This will let
you calculate how long an initial balance will last if you withdraw a fixed amount each month
and the remaining balance earns interest.
This program is freeware. Enjoy.
Flashcards - V3.0
I put this together for my kids to practice their basic math facts. It's a simple flashcard
program that covers addition, subtraction, multiplication and division. You can select any one
of the operations to practice on, or have the program mix them up. Though the default is 10,
facts up to 100 are selectable. Version 3.0 includes the ability to practice fractions.
A timer or a clock runs in the background, and a count of correct/incorrect
answers is displayed. This program is freeware. Enjoy.
Tellin Time - V1.1
I put this together for my kids to practice reading the time off of an analog clock.
It's based on a flashcard type game where an analog (12 hour) clock face displays a random
time. The child is then expected to enter the "digital equivalent".
A four minute timer runs in the background, and a count of correct/incorrect
answers is displayed. This program is freeware. Enjoy.
RPN Calculator - V1.3
If you're like me you love and cherish those 'ol HP hand calculators with their
Reverse-Polish-Notation operation. I've never been able to handle and keep straight
what's going on with the "standard notation" calculators - they're far too difficult for me
to use and try keeping track of the parenthesis. Fortunately, most (all) PCs come these
days with a built in calculator - unfortunately, its always standard notation form. I
finally got fed up with it and wrote my own RPN calculator. This program is freeware.
SI/PI Calculator - V2.6
Over the past 20+ years I've spent my professional career doing high speed Signal Integrity (SI) and
Power Integrity (PI) analysis. I am a big fan of Eric Bogatin,
in particular his "rules of thumb" for SI analysis. In the PI domain, I've also been appreciative of the works and publishings of
Douglas Brooks. From these two, and many others, I have gathered some various calculations
into an "SI/PI Calculator" for use on PCs. This program is freeware.
Back to my Home Page.
