Acoustic Directivity Patterns for Army Weapons
CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL
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This report describes tests conducted by this investigation on 12 types of Army heavy weapons at Fort Sill, OK, and the development of precise sound-pressure level contours directivity patterns for Army weapons currently in use. The data obtained during these tests was also used to compile tables relating the charge weight to an equivalent weight of C-4 plastic explosive. In addition, this investigation determine that elevation has little influence on weapon directivity patterns the major factor affecting weapon directivity patterns was the muzzle brake, which causes directivity patterns to become almost circular. The exceptions were recoilless rifles. Weight equivalency tables were found to be a function of tube size, with the longest tubes being the quietest, since the charges within them are the most contained.