Mass reducing projectile and method therefor

Patent metadata

Field	Value
Publication number	US-11585644-B2
Application number	US-202217573316-A
Country	US
Kind code	B2
Filing date	Jan 11, 2022
Priority date	Feb 5, 2021
Publication date	Feb 21, 2023
Grant date	Feb 21, 2023

Abstract

A mass reducing projectile is provided. The mass reducing projectile includes a shell, one or more weights, and a low melt fusible alloy. The one or more weights are disposed within the shell. The low melt fusible alloy is disposed within the shell so as to encase the one or more weights within the shell.

First claim

What is claimed is:

1. A mass reducing projectile comprising:
a shell;
one or more weights disposed within the shell; and
a low melt fusible alloy disposed within the shell so as to encase the one or more weights within the shell;
wherein the shell is configured to increase in temperature during flight to a temperature above a melting temperature of the low melt fusible alloy and the low melt fusible alloy is configured to melt at a predetermined temperature of the mass reducing projectile so that the one or more weights and the low melt fusible alloy are ejected from a pass-through aperture of the shell during flight of the mass reducing projectile.

2. The mass reducing projectile of claim 1 , wherein the one or more weights comprise one or more of rods and spheres.

3. The mass reducing projectile of claim 1 , wherein the shell comprises an outer surface with an absorptivity of 0.1 or greater.

4. The mass reducing projectile of claim 3 , wherein the outer surface comprises an absorptivity coating that effects the absorptivity.

5. The mass reducing projectile of claim 1 , wherein the shell comprises an internal cavity having the pass-through aperture through which the one or more weights and the low melt fusible alloy are inserted into the internal cavity.

6. The mass reducing projectile of claim 5 , wherein the shell, each of the one or more weights, and each piece of the ejected low melt fusible alloy is less than about 10% to about 15% of a total pre-flight mass of the mass reducing projectile.

7. A method forming a mass reducing projectile that comprises a shell, one or more weights, and a low melt fusible alloy, the method comprising:
stably holding the shell;
inserting the one or more weights into an internal cavity of the shell; and
inserting the low melt fusible alloy into the internal cavity so as to fill the internal cavity and encase the one or more weights within the internal cavity;
wherein the shell is configured to increase in temperature during flight to a temperature above a melting temperature of the low melt fusible alloy and the low melt fusible alloy is configured to melt at a predetermined temperature of the mass reducing projectile so that the one or more weights and the low melt fusible alloy are ejected from a pass-through aperture of the shell during flight of the mass reducing projectile.

8. The method of claim 7 , further comprising spinning the shell and the one or more weights around a geometric axis of rotation of the shell so as to spin balance the mass reducing projectile about the geometric axis of rotation.

9. The method of claim 7 , further comprising coating an outer surface of the shell with an absorptivity coating so as to increase an absorptivity of the mass reducing projectile.

10. The method of claim 7 , further comprising coating an internal cavity of the shell with a non-reactive coating so as to prevent chemical interaction between a material of the shell and at least the low melt fusible alloy within the internal cavity.

11. A munition comprising:
a casing;
an igniter disposed at least partially within the casing;
a propellant disposed within the casing and in communication with the igniter; and
a mass reducing projectile disposed at least partially within the casing so as to seal the propellant within the casing, the mass reducing projectile comprising:
a shell;
one or more weights disposed within the shell; and
a low melt fusible alloy disposed within the shell so as to encase the one or more weights within the shell;
wherein the shell is configured to increase in temperature during flight to a temperature above a melting temperature of the low melt fusible alloy and the low melt fusible alloy is configured to melt at a predetermined temperature of the mass reducing projectile so that the one or more weights and the low melt fusible alloy are ejected from a pass-through aperture of the shell during flight of the mass reducing projectile.

12. The munition of claim 11 , wherein the one or more weights comprise one or more of rods and spheres.

13. The munition of claim 11 , wherein the shell comprises an outer surface with an absorptivity of 0.1 or greater.

14. The munition of claim 13 , wherein the outer surface comprises an absorptivity coating that effects the absorptivity.

15. The munition of claim 11 , wherein the shell comprises an internal cavity having the pass-through aperture through which the one or more weights and the low melt fusible alloy are inserted into the internal cavity.

16. The munition of claim 15 , wherein the shell, each of the one or more weights, and each piece of the ejected low melt fusible alloy is less than about 10% to about 15% of a total pre-flight mass of the mass reducing projectile.

17. The mass reducing projectile of claim 1 , wherein the shell comprises the low melt fusible alloy.

18. The method of claim 7 , wherein the one or more weights are rods.

19. The method of claim 7 , wherein the one or more weights are spheres.

20. The method of claim 7 , wherein the one or more weights are rods and spheres.

Assignees

• Boeing Co

Inventors

• Nguyen Ngoc Hoang
• Cannova Catherine D
• Adam Steven J
• Watts Daniel A

Classifications

• F42B5/16

  characterised by composition or physical dimensions or form of propellant charge, {with or without projectile,} or powder (chemical composition C06B; {F42B5/24 takes precedence}) · CPC title

• F42B12/74

  of the core or solid body · CPC title

• F42B39/002

  Cartridge containers provided with cartridge-dispensing means · CPC title

• F42B33/14

  Surface treatment of cartridges or cartridge cases {(F42B33/004 takes precedence)} · CPC title

• F42B10/48 Primary

  Range-reducing, destabilising or braking arrangements, {e.g. impact-braking arrangements}; Fall-retarding means, {e.g. balloons, rockets for braking or fall-retarding}(F42B10/34 takes precedence) · CPC title