Gas pressure after-effect
The gas pressure aftereffect is the effect in which a projectile is initially accelerated slightly by the powder gases flowing out immediately after it emerges from the weapon barrel.
The increase in speed during the after-effect of the gas pressure is about 0.5% to 1.5% of the exit speed , when using muzzle brakes 1% to 3%, due to a longer period of after-effect.
Neither the exit or muzzle velocity nor the maximum velocity, both related to the barrel at rest, correspond to the initial external ballistic velocity, but this is an assumed projectile velocity related to the earth's surface at rest, with which the projectile would have to leave the barrel, without any influence the same projectile trajectory is obtained after the gas pressure after-effect.
Individual evidence
- ↑ Zentralblatt für Mechanik - Volumes 10-12 - Pages 243, 299 J. Springer., 1940