Aerodynamic Interference During Sabot Discard
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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An experimental program has been conducted to investigate disturbances to the trajectories of gun-launched, fin-stabilized projectiles during the sabot discard process. Correlated near muzzle and down range measurements of sabot component and projectile motion are acquired using both orthogonal, flash X-rays and a ballistics range. Apparent anomalous yawing motion of projectiles correlates with asymmetries in the sabot discard geometry. The perturbations to the flow around the projectile due to these asymmetries are calculated and shown to be of sufficient magnitude to produce significant alterations in the desired trajectory. For the rounds tested, the impulse due to aerodynamic interaction during sabot discard is of the same magnitude as the transverse impulse imparted to the projectile during in-bore acceleration.
- Ammunition and Explosives