EXPERIMENTAL OBSERVATIONS OF THE DYNAMIC BEHAVIOR OF LIQUID FILLED SHELL
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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Experiments with a 20mm M56 shell whose cylindrical cavity, fineness ratio 2.7, was filled with different amounts of various liquids demonstrated the existence of dynamic instability for a broad range of loading conditions. It was found that, for water-like liquids, the nutational component of yaw is divergent when 40 to 90 of the cavity is filled. For Hg, the yaw is divergent from about 25 to 100. The severity of instability or the rate of divergence of yaw increases with the increase in the specific gravity of the liquid.
- Ammunition and Explosives