Investigation of Back-Blast Attenuators for Recoilless Rifles
ROCKWELL INTERNATIONAL CANOGA PARK CA ROCKETDYNE DIV
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Based on a series of water table tests, various configurations of recoilless rifle back blast suppressor models were designed and fabricated for shock tube experiments. Various lengths of suppressor were tested with enclosed cavities for damping the blast wave. Because the blast wave suppression was less then desired, a new series of mufflers, using commercial washers, was tested. Attenuations of 62 to 74 per cent were measured in the regions of peak blast wave pressure. A design concept based on the best suppressor design tested was incorporated into a layout drawing. This suppressor design consisted of a multinozzle plate and adapter which attaches to the Army 105 mm recoilless rifle. A recommended test procedure for the 105 mm recolless rifle at Picatinny Arsenal included a series of tests at increasing chamber pressure.