High velocity ammunition round
OwnerAlan Z. Glasserinventor
Life of this patent
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Abstract
A sub-caliber bullet with an aerodynamic shape has long-range accuracy due to a high muzzle velocity and reduced time of flight to a target. The bullet has a forward portion, a mid-portion and an aft portion. The forward portion has a density in excess of 10/cm3 while the mid-portion has a lower density. The bullet has an aspect ratio of at least 5:1 and a diameter, d, that satisfies a Power Law equation: d=D*(x/L)n where D is a maximum bullet diameter, L is the length, x is a distance rearward from a nose of the bullet and n is a Power Law exponent that is between 0.5 and 0.75. In some embodiments, a blind bore extends into the mid-portion from the aft portion and a sustainer propellant within the blind bore ignites as the bullet exits a gun muzzle to provide a velocity boost and to overcome aerodynamic drag.
Claims27
A sub-caliber bullet having long-range accuracy, comprising:
- a forward portion, a mid-portion and an aft portion, said aft portion having an outwardly extending feature that contributes to aerodynamic stability;
- said forward portion being a first material having a first density that is in excess of 10 g/cm3 and both said mid-portion and said aft portion being of a material different from said first material and having a respective density that is less than said first density;
- said sub-caliber bullet having a length, L, to maximum diameter, D, aspect ratio, L:D, of at least 5:1;
- and
- a diameter, d, of said entire forward portion and of said entire mid-portion satisfying an aerodynamic equation selected from the group consisting of Power Law equation:
- d=D*(x/L)n
- where:
- x is a distance rearward from a nose of said sub-caliber bullet and n is a Power Law exponent that is between 0.5 and 0.75 and a Von Karman Ogive equation:
- d=D*((Θ−(sin(2Θ/2))/π1/2)1/2
- where
- Θ=arccos(1−(2*x)/L).
An ammunition round including a sub-caliber bullet having long range accuracy, comprising:
- a cartridge case filled with a cartridge propellant and having a bullet/sabot assembly partially inserted into an open end thereof:
- said sabot having a full caliber forward portion with a length effective to support said bullet;
- and
- said sub-caliber bullet having a forward portion, a mid-portion and an aft portion with said aft portion having an outwardly extending feature that contributes to aerodynamic stability and said forward portion being a first material having a first density that is in excess of 10 g/cm3 and both said mid-portion and said aft portion being of a material different from said first material and having a respective density that is less than said first density, said sub-caliber bullet having a length, L, to maximum diameter, D, aspect ratio, L:D, of at least 5:1 and a diameter, d, of said entire forward portion and of said entire mid-portion satisfying an aerodynamic equation selected from the group consisting of a Power Law equation:
- d=D*(x/L)n
- where:
- x is a distance rearward from a nose of said sub-caliber bullet and n is a Power Law exponent that is between 0.5 and 0.75, a Von Karman Ogive equation:
- d=D*((Θ−(sin(2Θ/2))/π1/2)1/2
- where
- Θ=arccos(1−(2*x)/L)
- and a multi conic ogive.
Dependencies are inferred from the claim text.