초록 ▼

A piece of small arms ammunition includes a jacket bullet of an aerodynamically optimized configuration having a profile, with the exception of its ends and of an attachment section, which is drag optimized in accordance with a relation derived from the known Haack equation. The range probable error

A piece of small arms ammunition includes a jacket bullet of an aerodynamically optimized configuration having a profile, with the exception of its ends and of an attachment section, which is drag optimized in accordance with a relation derived from the known Haack equation. The range probable error of the ammunition is further additionally and advantageously affected by the design of the head and tail end of the bullet.

대표청구항 ▼

Small arms ammunition comprising: a cartridge case containing a powder charge and having an open end, a closed end and a longitudinal axis; a percussion cap substantially centered at said closed end with respect to the longitudinal axis of said cartridge case; a rotationally symmetric jacket bullet

Small arms ammunition comprising: a cartridge case containing a powder charge and having an open end, a closed end and a longitudinal axis; a percussion cap substantially centered at said closed end with respect to the longitudinal axis of said cartridge case; a rotationally symmetric jacket bullet enclosing a metallic core located at said open end; said jacket bullet having opposed tip and rear ends, intermediate thereof an attachment section for attachment with said cartridge case and a radius r; said jacket bullet having a shape which is aerodynamically optimized in respect of drag and other than at said rear end and said attachment section having a profile which extends from said tip end of said jacket bullet at the origin of a rectangular coordinate system, in which the x-axis represents a jacket bullet axis of symmetry and the y-axis represents a direction of said radius r of the jacket bullet, and which is substantially determined by a continuous function r(x), according to which the value of the radius r continuously increases from a predetermined value at said tip end of the jacket to a maximum value r0 of the radius r and which has a continuous differential quotient (dr/dx) which has a finite positive value at said predetermined value of the radius r at said tip end of the jacket bullet and which decreases to a value of zero at the maximum value r0 of the radius r; the profile of the jacket bullet being determined, with the exception of the rear end and the attachment section for the cartridge case, by a sum function r(x)=r1(x1)+r2(x2) in which the range of x1 is defined in the range from x=0 to x=h by x1=(h/2)(1-cos a)-(s/2)(1+cos a), h representing an imaginary length of said bullet from x1 as determined by a=pp1 are given by [Figure] wherein arc cos ((h-s)/(h+s))≤a≤p2 is defined by x>h, in which range r2=constant=r0; wherein, in said sum function r1(x1)=0 when x>h and r2(x2)=0 when 0≤x≤h; and said profile of said jacket bullet having an imaginary tip which is spaced by a distance -s in the range of 0.1 to 0.5 r0 from the origin of the rectangular coordinate system, at which said tip end of said bullet is located.