BallisticCalculator

LGPL library for small arms ballistic calculations (Python 3.9+) Installation

Stable release from pypi, installing from binaries

(Contains c-extensions which offer higher performance)

pip install py-ballisticcalc

Build wheel package for your interpreter version by pypi sdist

Download and install MSVC or GCC depending on target platform

pip install Cython>=3.0.0a10 
pip install py-ballisticcalc --no-binary :all:

Also use git clone to build your own package

(Contains cython files to build your own c-extensions)

git clone https://github.com/o-murphy/py_ballisticcalc

Usage

Simple start

from py_ballisticcalc.profile import *
from py_ballisticcalc.bmath import unit


profile = Profile()
tested_data = profile.trajectory_data

for d in tested_data:
    distance = d.travelled_distance.convert(unit.DistanceMeter)
    velocity = d.velocity.convert(unit.VelocityMPS)
    mach = round(d.mach_velocity, 4)
    energy = d.energy
    time = round(d.time.total_seconds, 4)
    ogv = d.optimal_game_weight.get_in(unit.WeightPound)
    path = d.drop.convert(unit.DistanceCentimeter)
    hold = d.drop_adjustment.get_in(unit.AngularMOA) if distance.v > 1 else None
    windage = d.windage.convert(unit.DistanceCentimeter)
    wind_adjustment = d.windage_adjustment.get_in(unit.AngularMOA) if distance.v > 1 else None
    print(
        f'Distance: {distance}, '
        f'Velocity: {velocity}, '
        f'Mach: {mach}, '
        f'Energy: {energy}, '
        f'Time: {time}s, '
        f'Path: {path}, '
        f'Windage: {windage}'
    )

Use any modules directly if needed

from py_ballisticcalc.projectile import *
from py_ballisticcalc.drag import *
from py_ballisticcalc.weapon import *
from py_ballisticcalc.trajectory_calculator import *
from py_ballisticcalc.atmosphere import *
from py_ballisticcalc.shot_parameters import *
from py_ballisticcalc.bmath import unit

bc = BallisticCoefficient(0.223, DragTableG7)
projectile = ProjectileWithDimensions(bc, unit.Distance(0.308, unit.DistanceInch).validate(),
                                      unit.Distance(1.282, unit.DistanceInch).validate(),
                                      unit.Weight(168, unit.WeightGrain).validate())
ammo = Ammunition(projectile, unit.Velocity(2750, unit.VelocityFPS).validate())
zero = ZeroInfo(unit.Distance(100, unit.DistanceMeter).validate())
twist = TwistInfo(TwistRight, unit.Distance(11.24, unit.DistanceInch).validate())
weapon = Weapon.create_with_twist(unit.Distance(2, unit.DistanceInch).validate(), zero, twist)
atmosphere = Atmosphere()
shot_info = ShotParameters(unit.Angular(4.221, unit.AngularMOA).validate(),
                           unit.Distance(1001, unit.DistanceMeter).validate(),
                           unit.Distance(100, unit.DistanceMeter).validate())
wind = WindInfo.create_only_wind_info(unit.Velocity(5, unit.VelocityMPH).validate(),
                                      unit.Angular(-45, unit.AngularDegree).validate())

calc = TrajectoryCalculator()
data = calc.trajectory(ammo, weapon, atmosphere, shot_info, wind)

for d in data:
    distance = d.travelled_distance
    meters = distance.convert(unit.DistanceMeter)
    velocity = d.velocity.convert(unit.VelocityMPS)
    mach = round(d.mach_velocity, 4)
    energy = d.energy
    time = round(d.time.total_seconds, 4)
    ogv = d.optimal_game_weight.get_in(unit.WeightPound)
    path = d.drop.convert(unit.DistanceCentimeter)
    hold = d.drop_adjustment.get_in(unit.AngularMOA) if distance.v > 1 else None
    windage = d.windage.convert(unit.DistanceCentimeter)
    wind_adjustment = d.windage_adjustment.get_in(unit.AngularMOA) if distance.v > 1 else None
    print(
        f'Distance: {meters}, '
        f'Velocity: {velocity}, '
        f'Mach: {mach}, '
        f'Energy: {energy}, '
        f'Time: {time}s, '
        f'Path: {path}, '
        f'Windage: {windage}'
    )

Info

The library provides trajectory calculation for projectiles including for various applications, including air rifles, bows, firearms, artillery and so on.

3DF model that is used in this calculator is rooted in old C sources of version 2 of the public version of JBM calculator, ported to C#, optimized, fixed and extended with elements described in Litz's "Applied Ballistics" book and from the friendly project of Alexandre Trofimov and then ported to Go.

Now it's also ported to python3 and expanded to support calculation trajectory by multiple ballistics coefficients and using custom drag data (such as Doppler radar data ©Lapua, etc.)

The online version of Go documentation is located here: https://godoc.org/github.com/gehtsoft-usa/go_ballisticcalc

C# version of the package is located here: https://github.com/gehtsoft-usa/BallisticCalculator1

The online version of C# API documentation is located here: https://gehtsoft-usa.github.io/BallisticCalculator/web-content.html

Go documentation can be obtained using godoc tool.

The current status of the project is ALPHA version.

RISK NOTICE

The library performs very limited simulation of a complex physical process and so it performs a lot of approximations. Therefore the calculation results MUST NOT be considered as completely and reliably reflecting actual behavior or characteristics of projectiles. While these results may be used for educational purpose, they must NOT be considered as reliable for the areas where incorrect calculation may cause making a wrong decision, financial harm, or can put a human life at risk.