Accession Number : ADA322887

Title :   Venting Propellant Gases to Obtain Nonlethal Projectile Velocity.

Descriptive Note : Final rept.,

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Fansler, Kevin S. ; Widder, Jeffrey M. ; Cooper, Gene R.

PDF Url : ADA322887

Report Date : MAR 1997

Pagination or Media Count : 39

Abstract : Reducing muzzle velocities by variable venting of a gun barrel, thereby decreasing lethality, was investigated. Simulation was performed with an interior ballistics code (IBRGA) that was modified to have venting capabilities. Comparison of the code output with a classical solution yielded good agreement. Simulation of an M-16A2 rifle showed that venting might reduce the muzzle velocity to nonlethal values if venting could commence earlier than is possible with the present M855 round. To obtain data for comparison, M16 barrels were modified to be ventable by drilling pluggable holes in the barrel at given axial intervals. Venting propellant gas from the M16 barrels yielded data that agreed with simulation results for the lower venting areas but exhibited less agreement for high area venting. Further studies are planned using a .50-caliber barrel and round, with modifications of both the weapon and the round.

Descriptors :   *INTERIOR BALLISTICS, *VENTING, GUN BARRELS, REDUCTION, VARIABLES, HOLES(OPENINGS), LETHALITY, INTERNAL PRESSURE, COMBUSTION CHAMBER GASES, MUZZLE VELOCITY.

Subject Categories : Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE