krcmar@ballistics.eu

 

 Ballistics.eu

 

Home

Exterior Ballistics

Ballistics of Air Guns

Interior Ballistics

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:

  • Caliber

  • Bullet weight

  • Barrel length

  • Barrel "friction": energy losses due to friction (common value is 1.3)

  • Initial pressure (common value is 1.22 MPa)

  • Piston weight

  • Piston diameter

  • Piston friction (common value is 0.3)

  • Packing thickness: thickness of piston packing

  • Spring weight

  • Minimum and maximum force: force of spring before and after compression. Usually spring is partially compressed before loading = minimum force. After loading = maximum force.

  • Adiabatic exponent of air (common value is 1.35)

  • Air pressure (common value is 0.101 MPa)

  • Computation steps (recommended value is 0.01 ms)

 

Output parameters:

  • Bullet velocity as a function of time or travel

  • Bullet travel as a function of time

  • Piston velocity as a function of time

  • Piston travel as a function of time

  • Pressure in the piston as a function of time or travel

  • 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:

 

 

Click here to download!