REPORT ON THE EFFECT OF YAW ON ARMOR PENETRATION AND OF GUN TEMPERATURE ON YAW
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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Firings were carried out in caliber .50 barrels of various twists of rifling in an effort to determine the optimum one but with no conclusive result. The armor penetration was determined as a function of the yaw and it was found that the effect of yaw was negligible on penetration as compared with its effect on accuracy at long ranges. It was found that a relatively large percentage of rounds fired in a hot gun with caliber .50 M1 Ball and A.P. boat-tail bullets have appreciable yaws whereas the M1 Tracer flat-base bullet and several modifications of this bullet give much smaller yaws. Recommendations are made for additional tests with modified bullets and a gun having a modified throat contour before any additional work is done on the determination of the optimum twist of rifling.
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