The library provides trajectory calculations for projectiles, including for various applications, including air rifles, bows, firearms, artillery, and so on.
3DF (3 degrees of freedom) model that is used in this calculator is rooted in old C sources of version 2 of the public version of the JBM calculator, ported to C#, optimized, fixed, and extended with elements described in Litz's "Applied Ballistics" book and ideas of the friendly project by Alexandre Trofimov.
Changes made since porting original C sources:
"Deciphering" formulas and making them readable for anyone familiar with the school curriculum of physics.
New drag calculation method with higher accuracy (40+ approximation points for calculating polynomial coefficients vs 5-6).
New atmosphere parameters calculating basing on NASA formulas
New algorithm of step size definition to find the right balance between performance and accuracy.
Drift calculation is added using Liltz's formulas
Accuracy of the calculation is withing 0.5%/0.2moa (less than 2inch per 1000 yards) of the most modern commercial calculators.
The source code of the library is available in git: https://github.com/gehtsoft-usa/BallisticCalculator1
Please feel free to report defects in Git Issues.
The library is also available in Go: https://github.com/gehtsoft-usa/go_ballisticcalc
For those who are looking for a JavaScript version, I highly recommend Yet Another Ballistic Calculator project of our friend Alexandre Trofimov.
The current status of the project is ALPHA version.
Suggested reading:
Projectile motion at wiki.
Drag coefficient at wiki.
Ballistic coefficient at wiki.
External ballistics at wiki.
Density of air at wiki.
Recommended books: Applied Ballistics For Long Range Shooting 3rd Edition by Bryan Litz
Most of variables and parameters in the library are
defined using special data type Measurement,
defined in Gehtsoft.Measurement
package. This allows you to seamlessly switch between metric and
US system or even use them both in the same calculation.
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The information about the license |
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The explanation of the risks associated with using 3DF algorithms |
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The explanation that no warranties of any kind is associated with this code |
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The example of library use |
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The classes related to calculate a projectile trajectory. |
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Namespace BallisticCalculator.Reticle The classes to define and draw reticles. |
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Namespace BallisticCalculator.Reticle.Data The classes used to define the reticle image. |
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Namespace BallisticCalculator.Reticle.Draw The classes to draw a reticle and trajectory parameters as SVG image. |
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Namespace BallisticCalculator.Serialization The classes related to serialization of the library data. |
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