Systems Analysis of Clover Cartridge
PICATINNY ARSENAL DOVER NJ FELTMAN RESEARCH LABS
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A systems analysis of the Clover flash cartridge revealed that, of all components present, the lead azide and lead styphnate exhibit the lowest ignition temperatures on furnace heating of test cartridges. Skin temperature during the launching of a Clover cartridge assembly was found to be approximately 120 deg C, far below the ignition temperature of any of the cartridge components. Additional assemblies were preheated to temperatures of 120 and 140 deg C, and series fired. Cartridge skin temperatures of 200 and 270 deg C, respectively, were obtained. All cartridges fired in sequence with no malfunctions. It was thus established that none of the components are prematurely ignited by heat generated during launching. X-ray examination showed no discontinuities in component packing, and 40 ft free fall tests did not cause detonation of cartridges containing FP 790 only. A possible explanation of the premature detonations obtained during series firings is given based upon omission of the black powderbarium chromate expelling charge.