Ballistics.eu
Interior Ballistics of Spring Air Guns
Free program for computation of bullet and piston velocity and temperature and pressure in piston for Spring Air Guns. No installation, only 1 MB. Possibility to save or load input and output parameters from files.
Input parameters:
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Caliber
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Bullet weight
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Barrel length
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Barrel "friction": energy losses due to friction (common value is 1.3)
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Initial pressure (common value is 1.22 MPa)
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Piston weight
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Piston diameter
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Piston friction (common value is 0.3)
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Packing thickness: thickness of piston packing
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Spring weight
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Minimum and maximum force: force of spring before and after compression. Usually spring is partially compressed before loading = minimum force. After loading = maximum force.
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Adiabatic exponent of air (common value is 1.35)
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Air pressure (common value is 0.101 MPa)
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Computation steps (recommended value is 0.01 ms)
Output parameters:
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Bullet velocity as a function of time or travel
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Bullet travel as a function of time
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Piston velocity as a function of time
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Piston travel as a function of time
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Pressure in the piston as a function of time or travel
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Temperature in the piston as a function of time or travel
Bonus:
Computation of force of spring from wire thickness, spring diameter, number of active coil and spring compression:
