CAVITATING CORE OF FIREARM AMMUNITION Russian patent published in 2020 - IPC F42B10/42 

FIELD: weapons and ammunition.

SUBSTANCE: invention relates to ammunition for firearms intended for destruction of primarily underwater targets during underwater and air firing into water. Cavitating core of firearm ammunition comprises a head part coupled with secant nose surface along cavitating edge, central and aft part with gliding surface intended for stabilization of core in cavern due to one-sided periodic washing and gliding along cavern outline. Greatest diameter of the circle describing the cross-section of the planing surface determines the caliber of the core (D). In the plane of axial longitudinal section of the core envelope contour (R) of cross sections from cavitating edge to caliber of core (D) is limited by relationship: D_x=d×[1+(L_x/d)×2π×sin ϕ/π]^N, where: D_x is current diameter of enveloping cross-section (R) of core cross-sections at current length (L_x), mm; d is the cavitating edge diameter, mm; L_x is current core length, mm; ϕ=60…180° – angle of solution of tangents to secant nose surface at points of its conjugation with cavitating edge, measured from side of head part; N=0.25…0.40 is the core volume factor. Caliber of core (D) is equal to current diameter (D_x) of enveloping contour (R) at L_x=L, where L is length from cavitating edge to caliber of core (D). Center of mass of core is located at length X≥0.3 D before front edge of planing surface located on length (L).

EFFECT: as a result, the target destruction efficiency is improved due to the cavitating core (R) contour approximation to the cavity (W) contour in the water, the core mass increase and the cavitation stability loss with the overturn in the inhomogeneous (heterogeneous) and compressible water-containing medium.

7 cl, 6 dwg