The Ammunition

Ballistics

Perforation of Finite Targets

Penetration in Semi-Infinite Targets

Penetration and Perforation Calculations

Applications

Covid-19 Case Numbers - Similarity with Penetration

Papers

 

 

| contact | home |  

 

Interior Ballistics Calculator

The calculator estimates the achievable muzzle velocity of projectiles fired from smooth-bore tank cannons with a given caliber, projectile travel length, and given charge and projectile mass. The model was developed from a large pool of test data with 120 and 140 mm smooth-bore cannons.

Definitions:

Sebert Factor The Sebert factor defines the amount of propellant mass flowing together with the bullet through the barrel. Depending on caliber and propellent type it is a value between 0.43 und 0.48.

Projectile Travel Length The distance, traveled by the projectile, until it leaves the barrel


Boundaries of the input parameters:

Caliber

118 to 142 mm

Projectile travel length

4 to 7 m

Max. gas pressure

4000 to 6500 bar

Charge mass

7 to 17.5 kg - depending on caliber

Projectile mass

5.8 to 19.8 kg - depending on caliber

Sebert factor

0.43 to 0.48

Input Values:

Caliber

mm
Projectile travel length m
Max. gas pressure bar
Charge mass kg
Projectile mass kg
Sebert factor





Generic Examples:

 Caliber

120mm 

120mm 

130mm 

140mm 

 Tube type

L44 

L55 

L51 

L47 

 Projectile travel length (m)

4.74 

6.04 

5.87 

5.71 

 Max. gas pressure (bar)

5500 

5500 

5500 

5500 

 Charge mass (kg)

8.9 

8.9 

12.5 

16.5 

 Projectile mass (kg)

8.3 

8.3 

11 

14 

 Sebert factor

0.43 

0.43 

0.44 

0.45 

 Muzzle velocity (km/s)

1.679 

1.762 

1.693 

1.686 

 
   
   © April 2022 by Willi Odermatt