Cartridges and bullets

• US 9,719,762 B2
• Filed: 04/01/2015
• Issued: 08/01/2017
• Est. Priority Date: 04/01/2015
• Status: Active Grant

• Current Assignee: Keith A. Langenbeck
• Original Assignee: Keith A. Langenbeck
• Inventors: Langenbeck, Keith A.
• Primary Examiner(s): Abdosh, Samir
• Application Number:
  US14/676,792
• Publication Number:
  US 20160290774A1
• Time in Patent Office: 853 Days
• Field of Search: 102439
• 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 dual tangent 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;

a first curve segment on a base of the bullet, the first curve segment comprising a convex center point within a base profile of the bullet and forms an annular ridge therein;

a second curve segment on the base of the bullet, the second curve segment comprising a concave center point outside the base profile of the bullet and forms an annular trough therein, wherein

the first curve segment and the second curve segment form an ‘

S’

shaped cross-section on the bullet base configured to extend an effective flight range and a Coanda effect there around reducing air turbulence and drag on the bullet in flight; and

a plateau center portion of the base of the bullet lies in a plane intersecting the center points of the curved segments and orthogonal to a central axis of the bullet.

2. The improved bullet of claim 1, further comprising a plurality of annular dimples formed into a base of the bullet adjacent the boattail ogive, the dimples configured 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 1, further comprising a plurality of curved segments configured to join the bullet base and the boattail, the curved segments configured to effect a Coanda air flow across the curved segments.

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 configured 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. The improved bullet of claim 1, wherein a ratio of a concavity of the second curved segment to a convexity of the first curved segment is approximately one to one.

11. The improved bullet of claim 1, wherein a ratio of a length of a boattail cone to a length of the shank is approximately one to two.

12. The improved bullet of claim 1, wherein a ratio of a length of a boattail cone to a length of the cone ogive is approximately one to three.

13. The improved bullet of claim 1, wherein a ratio of a length of the boattail to a length of the shank of the bullet is approximately one to two.

14. The improved bullet of claim 4, 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.