Bullet with aerodynamic fins and ammunition using same

Abstract

An ammunition cartridge includes a tubular blank having a tail section in a shape of tail fins; a cap mated to a front section of the tubular blank; a solid core in a shape of a rod inside the tubular blank between the front and tail sections; and a casing having a propellant therein, the casing mated to the tubular blank. The core optionally includes an aerodynamic needle extending beyond the front portion. A portion of the aerodynamic needle inside the core is shaped as a spring. A muzzle wad and a washer are in contact with the muzzle wad and with the aerodynamic needle. The aerodynamic needle includes a portion embedded in the core that is shaped as a spring. The core includes a front portion and a rear portion, and a diameter of the front portion is larger than a diameter of the rear portion and is substantially equal to a diameter of the tubular blank. The cap can be conically shaped, round shaped, or can have a blunt front end, or can be shaped as two conical sections.

1 . A method for producing an arrow-shaped bullet, the method comprising:
 inserting a solid core having a shape of a rod into a tubular blank;   compressing a tail portion of the tubular blank to form a plurality of tail fins;   at least partially inserting a cap into a front portion of the tubular blank; and   compressing the front portion of the tubular blank to form a taper.   
   
   
       2 . The method of  claim 1 , wherein a thickness of the walls of the tubular blank, throughout its length, is the same before and after both compressing steps. 
   
   
       3 . The method of  claim 1 , wherein the cap includes a circular channel such that the front portion is compressed into the circular channel. 
   
   
       4 . The method of  claim 1 , wherein the compressed front portion includes a plurality of ridges. 
   
   
       5 . The method of  claim 1 , wherein the core includes any of metal, ceramic, plastic and metal-ceramic. 
   
   
       6 . The method of  claim 1 , further comprising compressing a rear portion of the tubular blank to a diameter that is smaller than a diameter of the core, prior to insertion of the core. 
   
   
       7 . The method of  claim 1 , wherein the step of compressing the front portion applies pressure to the tubular blank in a spiral direction. 
   
   
       8 . The method of  claim 1 , further comprising inserting a mold into the rear portion of the tubular blank prior to compressing the rear portion, and then withdrawing the mold. 
   
   
       9 . The method of  claim 1 , further comprising compressing a portion of the tubular blank prior to insertion of the core so that the core cannot move freely within the tubular blank. 
   
   
       10 . A method for producing an arrow-shaped bullet, the method comprising:
 inserting a solid core having a shape of a rod into a tubular blank;   inserting a first mold into the front portion of the tubular blank;   compressing a tail portion of the tubular blank to form a plurality of tail fins;   withdrawing the first mold;   inserting a mold into the front portion of the tubular blank;   compressing the front portion of the tubular blank; and   withdrawing the second mold.   
   
   
       11 . An ammunition cartridge comprising:
 a tubular blank having a tail section in a shape of tail fins;   a cap mated to a front section of the tubular blank;   a solid core in a shape of a rod inside the tubular blank between the front and tail sections; and   a casing having a propellant therein, the casing mated to the tubular blank.   
   
   
       12 . The ammunition cartridge of  claim 11 , wherein the core further comprises an aerodynamic needle extending beyond the front portion. 
   
   
       13 . The ammunition cartridge of  claim 12 , wherein a portion of the aerodynamic needle inside the core is shaped as a spring. 
   
   
       14 . The ammunition cartridge of  claim 13 , further comprising an aerodynamic needle extending from the core and beyond the front portion. 
   
   
       15 . The ammunition cartridge of  claim 12 , further comprising a muzzle wad, and a washer in contact with the muzzle wad and with the aerodynamic needle. 
   
   
       16 . The ammunition cartridge of  claim 12 , wherein the aerodynamic needle includes a portion embedded in the core that is shaped as a spring. 
   
   
       17 . The ammunition cartridge of  claim 12 , wherein the core includes a front portion and a rear portion, and wherein a diameter of the front portion is larger than a diameter of the rear portion and is substantially equal to a diameter of the tubular blank. 
   
   
       18 . The ammunition cartridge of  claim 11 , wherein the cap is conically shaped. 
   
   
       19 . The ammunition cartridge of  claim 11 , wherein the cap has a blunt front end. 
   
   
       20 . The ammunition cartridge of  claim 11 , wherein the cap is shaped as two conical sections. 
   
   
       21 . The ammunition cartridge of  claim 11 , wherein the propellant includes both fast-burning gunpowder and gunpowder blocks. 
   
   
       22 . The ammunition cartridge of  claim 11 , further comprising a metal armoring rod and a soft metal filling inside the tubular blank, the metal armoring rod shaped into an extractor-needle. 
   
   
       23 . The ammunition cartridge of  claim 11 , further comprising an aerodynamic needle projecting forward from the tubular blank, wherein the aerodynamic needle is formed by compression of a material of a forward portion of the tubular blank. 
   
   
       24 . The ammunition cartridge of  claim 11 , wherein the rear portion of the tubular blank is compressed so that there is substantially no space between the tail fins. 
   
   
       25 . The ammunition cartridge of  claim 11 , wherein the rear portion of the tubular blank is compressed so that there is empty space left between the tail fins. 
   
   
       26 . An ammunition cartridge comprising:
 a tubular blank having a tail section in a shape of tail fins;   a tapered front section of the tubular blank; and   a solid core in a shape of a rod inside the tubular blank between the front and tail sections,   wherein the tapered front section includes a conical portion and a substantially round portion forward of the conical portion.   
   
   
       27 . An ammunition cartridge comprising:
 a tubular blank having a tail section in a shape of tail fins;   a tapered front section of the tubular blank;   a core in a shape of a rod inside the tubular blank between the front and tail sections; and   pyrotechnic charge in the tail section.