Modellierung der Innenballistik von durch Gas Luft Gemische angetriebenen Projektilen Stumpfes Trauma Innenballistik Kanone Gasdruck Gascombustiongun Blunt ballistic impact Blunt trauma Internal ballistics Potato guns are popular homemade guns which work on the principle of gas combustion. They are usually constructed for recreational rather than criminal purposes. Yet some serious injuries and fatalities due to these guns are re ported. As information on the internal ballistics of homemade gas combustion powered guns is scarce it is the aim of this work to provide an experimental model of the internal ballistics of these devices and to investigate their basic physical param eters. A gas combustion gun was constructed with a steel tube as the main component. Gas air mixtures of acetylene hydro gen and ethylene were used as propellants for discharging a 46 mm caliber test projectile. Gas pressure in the combustion chamber was captured with a piezoelectric pressure sensor. Projectile velocity was measured with a ballistic speed mea surement system. The maximum gas pressure the maximum rate of pressure rise the time parameters of the pressure curve and the velocity and path of the projectile through the barrel as a function of time were determined according to the pressure time curve. The maximum gas pressure was measured to be between 1.4 bar (ethylene) and 4.5 bar (acetylene). The highest maximum rate of pressure rise was determined for hydrogen at (dp dt)max=607 bar s. The muzzle energy was calculated to be between 67 J (ethylene) and 204 J (acetylene). To conclude this work provides basic information on the internal ballistics of homemade gas combustion guns. The ...