A small contribution to the shooting community

[Eaglet]

lightbulb A SMALL CONTRIBUTION TO THE SHOOTING COMMUNITY lightbulb

I have created a small application that uses most of the equations found in
the book Applied Ballistics for Long Range Shooting by
Bryan Litz
I find it very useful and it sure is a great tool to get very close values for BC7, BC1
from measurements of a long range bullet. There are various equations that are
fun to use.

It's a very simple straight forward application that would be useful for some of the
long range shooting addicts.

It's only for the Windows Platform, unfortunately.

Download the zipped file named "readme.zip". When you unzip it there will be two
files, one is the ".exe" application and the other one is the readme.text file.

Please read the short readme.text file before you run it.

You don't have to install it; I recommend you drop the ".exe" file on your desk top
and your ready to go after checking the readme.text file.
**************************
Version 2.0.0.0 is out!!!! Link below was changed.
****************************
http://pages.sbcglobal.net/jomoncada/Eaglet_Ballistics/eaglet_ballistics.zip

Those interested in receiving updates please e-mail me at [email protected]
In the Subject box write: Eaglet Ballistic Calcs

Those that received this as an e-mail will automatically receive the updates, but
if you are not interested just e-mail me and I will remove you from the mailing list.

As a man of honor and a minister I assure you your e-mails will only be used by others
if I get killed first!

Sincerely,

Javier O Moncada

 

[Eaglet]

Changes have been made to allow the application to run
in smaller resolution screens. Just download it from the
same link above and replace the old file with the new.

 

[Mikecr]

Where do we get RT/R?

 

[Eaglet]

Where do we get RT/R?

Mikecr, good question!

I will tell you how I do it.

I know is a value between 0.5 and 1.0 by studying the bullet diagrams on

Bryan Litz's book, I can get pretty close at guessing the number. I have tested

my self and as the book states it, it can easily be done. It also states

how difficult it is to calculate it. You might find some info. on line that would be

useful. What we need to keep in mind is that we don't have a whole lot to

err with, we'll go from 0.5 to 1.0 being 1.0 perfectly tangent ogive radius.

By looking at the bullets diagrams and seeing their Rt/R ratio values and how

they change in value as the bullet ogive changes you get a pretty good idea of

what you're doing.

I know I'm not giving you what you want to hear, but with a bit of practice

one can really get close to calculating them BC7s.

There is a whole lot to learn about that stuff!

 

[Mikecr]

I'll keep looking.
May need a tool(laser mic) & software to derive it...
Wonder how Bryan obtained RT/R

 

[Eaglet]

Note to all:

Please know that I'm not in violation of any rights what's so ever and that Mr. Litz,
Bryan Litz, does not condemn the release of my small application linked for
on the top post.

Please read what Mr. Litz said:

A SMALL CONTRIBUTION TO THE SHOOTING COMMUNITY - Sniper's Hide Forums

 

[Pdvdh]

Changes have been made to allow the application to run
in smaller resolution screens. Just download it from the
same link above and replace the old file with the new.

Very convenient. Thanks for sharing the benefits of your work product!

 

[Eaglet]

phorwath,

You are very welcome!

And Thank You again for the kind help you provided for me!

 

[BryanLitz]

I'll keep looking.
May need a tool(laser mic) & software to derive it...
Wonder how Bryan obtained RT/R

I wouldn't wish my tedious method on anyone.

First step is to mount the bullet in a lathe and indicate the bullet ogive with a dial indicator every 0.025" along it's surface. Then input those coordinates into a computer program that calculates ogive radius and length. Then calculate the radius of a perfectly tangent ogive of that length. Finally, divide the 'perfectly tangent' ogive radius by the measured ogive radius. The result is Rt/R.

I'm sure there are other ways to skin this cat, but I've found this method to be (more or less) reliable and repeatable even if it is a little maddening.

-Bryan

 

[Eaglet]

I'm glad you answered that one. If my memory serves me well I did not read
that in the book.

It's a pretty awesome sneaky way of doing it. I like that!

Thanks!

 

[Eaglet]

Dear Folks,

The OGW box was not calculating the varmint weight correctly.
It was, of course, my bad. I also added to the info section seen
when you right click on the underlined portion.

just download from the link and replace the file.
My thanks to the person who caught it and e-mailed me. I don't
know his name. "I have a strong feeling is a 'He' ".

Please excuse me for the inconvenience.

http://pages.sbcglobal.net/jomoncada/Eaglet_Ballistic_Calcs/readme.zip

Sincerely,

Javier Moncada

 

[Chas1]

Looks like you spent alot of time putting this together. Thank you for sharing.

 

[Eaglet]

Looks like you spent alot of time putting this together. Thank you for sharing.

You're welcome!

The Lord willing, I'll be adding more to it and make it even more useful.

 

[Eaglet]

Re: (UPDATE) A small contribution to the shooting community

A new tab page has been added. This concludes all of the book's formulas.
A photo was also added for now to occupy empty space.

Due to a small change in the .exe's name you'll have to delete the old one
since it will not be replaced.

Your input is appreciated.


http://pages.sbcglobal.net/jomoncada/Eaglet_Ballistics/eaglet_ballistics.zip