The Influence of Helical Serrations and Bullet Engraving on the Aerodynamic and Stability Properties of a Body on Revolution with Spin
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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Discrepancies in the predicted and observed stability behavior of bullets sometimes occur at longer ranges. Experiments in the BRL supersonic wind tunnel and range suggest that this behavior may be due to subtle aerodynamic effects of the helical engraving. The wind tunnel tests were made at supersonic Mach numbers on spinning models with accentuated helical serrations. The tests covered a range of angle of attack, Reynolds number and mismatch between the spin of the model and the twist of the serrations. The range data were obtained on both standard ammunition and models.
- Ammunition and Explosives