Cartridges and Bullets

• US 20160290774A1
• Filed: 04/01/2015
• Published: 10/06/2016
• Est. Priority Date: 04/01/2015
• Status: Active Grant

• Current Assignee: Keith A. Langenbeck
• Original Assignee: Keith A. Langenbeck
• Inventors: Langenbeck, Keith A.
• Granted Patent: US 9,719,762 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F42B 30/02 Bullets
• CPC Class Codes: F42B 5/025 characterised by the dimension of the case or the missile

Abstract

An improved bullet disclosed includes a blend radius disposed between a first tangent thereof intersecting a shank of the bullet and a second tangent thereof intersecting one of a cone ogive and a boattail ogive of the bullet. The bullet also includes at least one dimple formed into a base of the bullet adjacent the boattail ogive, a curved segment joining the dimpled base and the boattail cone and a truncated cone ogive with a meplat end and a shank end, the truncated cone ogive adapted to produce less drag and friction in air than a secant or a tangent ogive. The improved bullet extends an effective flight range and a Coanda effect there around reducing air turbulence and drag on the bullet in flight. A cartridge adapted to receive the improved bullet is necked down and shortened for a COAL (cartridge overall length) nominally the same as conventional cartridges.

Claims

1. An improved bullet comprising a blend radius disposed between a first tangent thereof intersecting a shank of the bullet and a second tangent thereof intersecting one of a cone ogive and a boattail of the bullet, the dual tangent blend radius configured to extend an effective flight range and a Coanda effect there around reducing air turbulence and drag on the bullet in flight.

2. The improved bullet of claim 1, further comprising at least one dimple formed into a base of the bullet adjacent the boattail ogive, the dimple adapted to effect a Coanda air flow around the base and reduce a turbulence and a drag on the bullet in flight.

3. The improved bullet of claim 2, further comprising a curved segment joining the dimpled base and the boattail, the curved segment configured to effect a Coanda air flow across the curved segment.

4. The improved bullet of claim 1, further comprising a truncated cone ogive with a meplat end and a shank end, the truncated cone ogive adapted to produce less drag and friction in air than a secant or a tangent ogive.

5. The improved bullet of claim 1, wherein the dual tangent blend radius is equal to or larger than a radius of the shank of the improved pistol bullet.

6. The improved bullet of claim 1, wherein a radius of curvature and an arc length of a first dual tangent blend radius between the cone ogive and the shank and a second dual tangent blend radius between the boattail cone and the shank are substantially the same.

7. The improved bullet of claim 1, wherein a length of the boattail cone is shorter than a length of the cone ogive but the respective dual tangent blend radii being mirror images of each other.

8. The improved bullet of claim 1, wherein a fineness ratio of the ogive cone length to a diameter of the bullet is larger than 1.20 plus or minus a ten percent manufacturing tolerance.

9. The improved bullet of claim 1, wherein an aspect ratio of a length of the bullet to a diameter thereof is larger than 1.75 plus or minus a ten percent manufacturing tolerance.

10. An improved bullet and cartridge system comprising:

an improved bullet comprising a blend radius disposed between a first tangent thereof across a shank of the bullet and a second tangent thereof across one of a cone ogive and a boattail cone of the bullet; and

a cartridge adapted to receive the improved bullet, the cartridge configured to be necked down and shortened for a COAL (Cartridge Over All Length) that is nominally the same as conventional cartridges.

11. The improved bullet and cartridge system of claim 10, wherein a medium frame pistol cartridge COAL is less than 1.17 inches for an 30 SS™

and a nominal 1.14 inches for a 30-40 AS™

designated herein, a large frame pistol cartridge COAL is a nominal 1.280 for a 30 Super™ and

a nominal 1.26 for a 30-40 AS™

designated herein.

12. The improved bullet and cartridge system of claim 10, wherein a bullet received into one of a 30 SS™

designated cartridge and a 30 Super™

designated cartridge comprises a nominal bullet length of 0.64 inches, a nominal bottleneck length of 0.25 inches, a bullet diameter of 0.308 inches, a nominal neck diameter of 0.333 inches and a nominal weight of 90-110 grains plus or minus a ten percent manufacturing tolerance on dimensions and weight.

13. The improved bullet and cartridge system of claim 10, further comprising a ratio of a 30 SS™

designated cartridge COAL to the diameter of the improved pistol bullet received therein is approximately 3.80 and a ratio of a 30 Super™

designated cartridge COAL to the diameter of the improved pistol bullet received therein is approximately 4.16.

14. The improved bullet and cartridge system of claim 10, further comprising a ratio of a 30-40 AS™

medium frame designated cartridge COAL to the diameter of the improved pistol bullet received therein is approximately 3.70 and a ratio of a 30-40 Automatic™

large frame designated cartridge COAL to the diameter of the improved pistol bullet received therein is approximately 4.10.

15. An improved bullet comprising:

an improved bullet comprising a blend radius disposed between a first tangent thereof across a shank of the bullet and a second tangent thereof across one of a cone ogive and a boattail cone of the bullet;

a plurality of dimples formed into a base adjacent the boattail cone to effect a Coanda air flow there around and reduce turbulence and drag;

a curved segment joining the dimpled base and the boattail cone, the curved segment configured to effect a Coanda air flow there across; and

a truncated cone ogive with a meplat end and a shank end, the truncated cone ogive adapted to reduce drag and friction of air on the bullet in flight.

16. The improved bullet of claim 15, wherein a ratio of a concavity of a dimple to a convexity of the curved segment is approximately one to one.

17. The improved bullet of claim 15, wherein a ratio of a length of the boattail cone to a length of the shank is approximately one to two.

18. The improved bullet of claim 15, wherein a ratio of a length of the boattail cone to a length of the cone ogive is approximately one to three.

19. The improved bullet of claim 15, wherein a ratio of a length of the boattail to a length of the shank of the bullet is approximately one to two plus or minus 10 percent for manufacturing tolerances.

20. The improved bullet of claim 15, wherein a ratio of a diameter of the meplat end of the truncated cone to a length of the truncated cone of the bullet is approximately 1.0 to 2.5 plus or minus 10 percent for manufacturing tolerances.