The 6O-mm M49A4 mortar projectile experienced large range standard deviations, short round, and excessive duds during lot acceptance tests conducted during 1992. Previous wind tunnel testing and trajectory analysis identified resonance instability as a possible cause of the poor test results. The current wind tunnel test was performed to study the spin characteristics of the M49A4 projectile with both standard and modified M2 fin assemblies. Tests performed using standard fin ...
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