Hydrostatic Shock
Definition
The contested hypothesis that a high-velocity bullet generates a remote pressure wave through body fluids sufficient to produce immediate neurological incapacitation without direct CNS contact. Supported by Courtney + Courtney (2007-2015); disputed by MacPherson (1994) on fluid-mechanical grounds. Not confirmed by NATO, DSTL, FBI, or Indian DRDO as a clinical-threshold phenomenon.
- Proponents
- Courtney and Courtney, publications 2007-2015
- Main critic
- MacPherson (1994), on fluid-mechanical grounds
- Official recognition
- Not confirmed by NATO, DSTL, FBI or Indian DRDO as a clinical threshold
- Field
- Terminal ballistics and wound ballistics
Common questions
Why is hydrostatic shock still debated among ballistics researchers?+
The disagreement centers on whether a remote pressure wave can disrupt brainstem function without direct tissue destruction; critics argue the pressures involved are too brief and too small relative to normal physiological pressure swings to cause incapacitation on their own.
Does rejecting hydrostatic shock mean pressure waves have no wounding effect at all?+
No. Temporary cavitation and pressure effects are accepted as contributing to tissue damage near the wound track; what remains contested is the claim of remote, instantaneous neurological shutdown far from the permanent cavity.
Related terms
- FBI 10% Gelatin Protocol
- The standard medium for law-enforcement ammunition testing, adopted after the 1986 Miami shootout. Ten percent by weight porcine gelatin calibrated with a...
- Permanent Cavity
- The lasting wound channel produced by the bullet's direct crushing and laceration of tissue. Diameter approximates expanded projectile diameter. At handgun velocities,...
- Sectional Density (SD)
- The ratio of a bullet's mass to the square of its diameter. Higher SD values predict greater penetration depth in a given...
- Temporary Cavity
- The transient radial tissue displacement produced by a bullet's passing. Caused by the transfer of kinetic energy to surrounding tissue via compression...