Prediction of Projectile Ricochet Behavior After Water Impact

Authors

  • Yves Baillargeon M.Eng,

    1. Vehicle Protection Group, Defence Research and Development Canada – Valcartier (DRDC Valcartier), Protection and Weapons Effects Section, 2459, Pie-XI Blvd North, Québec QC G3J-1X5, Canada.
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  • Guy Bergeron M.Sc.

    1. Vehicle Protection Group, Defence Research and Development Canada – Valcartier (DRDC Valcartier), Protection and Weapons Effects Section, 2459, Pie-XI Blvd North, Québec QC G3J-1X5, Canada.
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  • Presented in part at the Tripartite Technical Cooperation Program (TTCP MAR AG-10) Meeting, April 20–24, 2009, in Halifax, NS, Canada.

Additional information and reprint requests:
Yves Baillargeon, M.Eng.
Protection and Weapons Effects Section
Defence Research and Development Canada – Valcartier (DRDC Valcartier)
2459, Pie-XI Blvd North
Québec QC G3J-1X5
Canada
E-mail: yves.baillargeon@drdc-rddc.gc.ca

Abstract

Abstract:  Although not very common, forensic investigation related to projectile ricochet on water can be required when undesirable collateral damage occurs. Predicting the ricochet behavior of a projectile is challenging owing to numerous parameters involved: impact velocity, incident angle, projectile stability, angular velocity, etc. Ricochet characteristics of different projectiles (K50 BMG, 0.5-cal Ball M2, 0.5-cal AP-T C44, 7.62-mm Ball C21, and 5.56-mm Ball C77) were studied in a pool. The results are presented to assess projectile velocity after ricochet, ricochet angle, and projectile azimuth angle based on impact velocity or incident angle for each projectile type. The azimuth ranges show the highest variability at low postricochet velocity. The critical ricochet angles were ranging from 15 to 30°. The average ricochet angles for all projectiles were pretty close for all projectiles at 2.5 and 10° incident angles for the range of velocities studied.

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