Spotter ammunition projectile and method for making the same
11473888 · 2022-10-18
Assignee
Inventors
Cpc classification
F42B12/40
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F42B33/001
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F42B8/02
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F42B5/02
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F42B12/38
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
International classification
F42B12/40
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F42B5/02
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F42B33/00
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F42B12/38
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F42B8/02
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Abstract
Spotter ammunition projectiles adapted to be fired from a firearm, methods for making spotter ammunition projectiles, and spotter ammunition cartridges including spotter ammunition projectiles are provided. In one example, a spotter ammunition projectile includes a projectile body section extending in a distal direction to a body distal end portion. A projectile ogive is coupled to the body distal end portion and has an outer ogive surface that tapers in the distal direction towards a shoulder. The projectile ogive includes a post that is disposed adjacent to the shoulder and that extends therefrom in the distal direction. An ogive nose cap is disposed adjacent to the shoulder and covers the post. The post and the ogive nose cap are cooperatively configured to define a cavity therebetween. A pyrotechnic spotter composition is disposed in the cavity.
Claims
1. A spotter ammunition projectile adapted to be fired from a firearm, the spotter ammunition projectile comprising: a projectile body section having a generally cylindrical shape extending in a distal direction about a longitudinal axis to a body distal end portion; a projectile ogive coupled to the body distal end portion and having an outer ogive surface that tapers in the distal direction towards a shoulder that is disposed about the longitudinal axis, wherein the projectile ogive comprises a post disposed adjacent to the shoulder and extending therefrom along the longitudinal axis in the distal direction to a post distal end portion; an ogive nose cap disposed adjacent to the shoulder and having a wall that extends therefrom in the distal direction covering the post, the wall having an inner nose cap surface that faces towards the post and an outer nose cap surface that is disposed on a side opposite the inner nose cap surface and that tapers in the distal direction towards the longitudinal axis, wherein the post and the ogive nose cap are cooperatively configured to define a cavity between at least a portion of the post and the inner nose cap surface; and a pyrotechnic spotter composition disposed in the cavity.
2. The spotter ammunition projectile of claim 1, wherein the cavity is disposed between the post distal end portion and the inner nose cap surface.
3. The spotter ammunition projectile of claim 2, wherein the post distal end portion is one of a conical end portion, a stepped distal end portion, a flat distal end portion, and a radiused distal end portion.
4. The spotter ammunition projectile of claim 1, wherein the wall of the ogive nose cap defines a conical-shaped nose cap that has a thick wall section and the thin wall section that is thinner than the thick wall section and that is disposed distally from the thick wall section.
5. The spotter ammunition projectile of claim 4, wherein the pyrotechnic spotter composition is disposed in the cavity adjacent to the thin wall section.
6. The spotter ammunition projectile of claim 4, wherein the inner nose cap surface of the thin wall section tapers in the distal direction towards the longitudinal axis.
7. The spotter ammunition projectile of claim 6, wherein the projectile body section has a diameter and the thin wall section has a length that is less than the diameter of the projectile body section.
8. The spotter ammunition projectile of claim 4, wherein the inner nose cap surface of the thick wall section is substantially parallel to the longitudinal axis.
9. The spotter ammunition projectile of claim 8, wherein the inner nose cap surface of the thick wall section is in direct contact with an outer surface of the post to form a press fit with the post, thereby securing the ogive nose cap to the projectile ogive.
10. The spotter ammunition projectile of claim 4, wherein the post has a post proximal end portion opposite the post distal end portion, and wherein shoulder is an annular shoulder disposed around the longitudinal axis extending radially outward from the post proximal end portion.
11. The spotter ammunition projectile of claim 10, wherein the thick wall section has an annular proximal end surface that extends between the inner nose cap surface and the outer nose cap surface and that interfaces with the annular shoulder.
12. The spotter ammunition projectile of claim 11, further comprising an O-ring that sealingly interfaces with the annular shoulder and the annular proximal end surface.
13. The spotter ammunition projectile of claim 11, further comprising lacquer that sealingly interfaces with the annular shoulder and the annular proximal end surface.
14. The spotter ammunition projectile of claim 1, wherein the ogive nose cap comprises aluminum, magnesium, or titanium.
15. The spotter ammunition projectile of claim 1, wherein the pyrotechnic spotter composition is present in the cavity in an amount of from about 0.5 g to about 1.5 g.
16. A spotter ammunition cartridge adapted to be chambered in a firearm, the spotter ammunition cartridge comprising: a cartridge case comprising a generally cylindrical shell having a shell wall that surrounds an internal volume and that extends in a distal direction about a longitudinal axis to a case mouth portion; a spotter ammunition projectile comprising: a projectile body section disposed in the case mouth portion and having a generally cylindrical shape extending in the distal direction about the longitudinal axis to a body distal end portion; a projectile ogive coupled to the body distal end portion and having an outer ogive surface that tapers in the distal direction towards a shoulder that is disposed about the longitudinal axis, wherein the projectile ogive comprises a post disposed adjacent to the shoulder and extending therefrom along the longitudinal axis in the distal direction to a post distal end portion; an ogive nose cap disposed adjacent to the shoulder and having a wall that extends therefrom in the distal direction covering the post, the wall having an inner nose cap surface that faces towards the post and an outer nose cap surface that is disposed on a side opposite the inner nose cap surface and that tapers in the distal direction towards the longitudinal axis, wherein the post and the ogive nose cap are cooperatively configured to define a cavity between at least a portion of the post and the inner nose cap surface; and a pyrotechnic spotter composition disposed in the cavity; and a propellant disposed in the internal volume and ignitable to propel the spotter ammunition projectile from the case mouth in the distal direction.
17. The spotter ammunition cartridge of claim 16, wherein the spotter ammunition projectile is a medium caliber projectile selected from a 20 mm caliber projectile, a 25 mm caliber projectile, a 30 mm caliber projectile, a 35 mm caliber projectile, and a 40 mm caliber projectile.
18. The spotter ammunition cartridge of claim 16, wherein the spotter ammunition projectile is a large caliber projectile selected from a 57 mm caliber projectile, a 76 mm caliber projectile, a 105 mm caliber projectile, a 120 mm caliber projectile, and a 155 mm caliber projectile.
19. A method for making a spotter ammunition projectile adapted to be fired from a firearm, the method comprising the steps of: obtaining a projectile body section and a projectile ogive, wherein the projectile body section has a generally cylindrical shape extending in a distal direction about a longitudinal axis to a body distal end portion, wherein the projectile ogive is configured to couple to a body distal end portion and has an outer ogive surface that tapers in the distal direction towards a shoulder that is disposed about the longitudinal axis, wherein the projectile ogive comprises a post disposed adjacent to the shoulder and extending therefrom along the longitudinal axis in the distal direction to a post distal end portion; depositing a pyrotechnic spotter composition adjacent to an inner nose cap surface of a wall of an ogive nose cap; and disposing the ogive nose cap adjacent to the shoulder such that the wall covers the post and the inner nose cap surface faces towards the post, wherein the wall has an outer nose cap surface that is disposed on a side opposite the inner nose cap surface and that tapers in the distal direction towards the longitudinal axis, wherein the post and the ogive nose cap are cooperatively configured to define a cavity between at least a portion of the post and the inner nose cap surface, and wherein the pyrotechnic spotter composition is disposed in the cavity.
20. The method of claim 19, wherein the wall of the ogive nose cap has a thick wall section, and wherein disposing comprises press fitting the projectile ogive and the ogive nose cap together such that the inner nose cap surface of the thick wall section advances over and is in direct contact with an outer surface of the post to form a press fit that secures the ogive nose cap to the projectile ogive.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
(1) The various embodiments will hereinafter be described in conjunction with the following drawing figures, wherein like numerals denote like elements, and wherein:
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DETAILED DESCRIPTION
(14) The following Detailed Description is merely exemplary in nature and is not intended to limit the various embodiments or the application and uses thereof. Furthermore, there is no intention to be bound by any theory presented in the preceding background or the following detailed description.
(15) Various embodiments contemplated herein relate to spotter ammunition projectiles and methods for making spotter ammunition projectiles. The exemplary embodiments taught herein provide a spotter ammunition projectile adapted to be fired from a firearm. The spotter ammunition projectile includes a projectile body section having a generally cylindrical shape extending in a distal direction about a longitudinal axis to a body distal end portion.
(16) A projectile ogive is coupled to the body distal end portion. As used herein, the term “ogive” is understood to mean an object having a tapered 3-D end portion, for example a substantially linear, slightly rounded and/or rounded 3-D tapered end portion. In an exemplary embodiment, the projectile ogive has an outer ogive surface that tapers in the distal direction towards a shoulder that is disposed about the longitudinal axis. The projectile ogive includes a post that is disposed adjacent to the shoulder defining a shouldered post configuration and that extends therefrom along the longitudinal axis in the distal direction to a post distal end portion.
(17) An ogive nose cap is disposed adjacent to the shoulder and has a wall that extends therefrom in the distal direction covering the post. The wall has an inner nose cap surface that faces towards the post and an outer nose cap surface that is disposed on a side opposite the inner nose cap surface and that tapers in the distal direction towards the longitudinal axis. The post and the ogive nose cap are cooperatively configured to define a cavity between at least a portion of the post and the inner nose cap surface. A pyrotechnic spotter composition is disposed in the cavity.
(18) In an exemplary embodiment, the spotter ammunition projectile may be sized or otherwise configured as a small, medium, or large caliber spotter projectile. In an exemplary embodiment, advantageously the spotter ammunition projectile uses only a relatively small amount (e.g., about 1.5 gram (g) or less) of pyrotechnic spotter composition that provides a bright light flash, which is visible from about 1000 meters (m) to about 1500 m or further in daylight condition without optical tools, when impacting a relatively thin steel target (e.g., less than or about 3 mm thick). In one example, the pyrotechnic spotter composition is present in the cavity in an amount of about 0.5 g or less. In another example, the pyrotechnic spotter composition is present in the cavity in an amount of from about 0.5 g to about 1.5 g. In yet another example, the pyrotechnic spotter composition is present in the cavity in an amount of about 1.5 g to provide a bright light flash that is visible up to about 1500 m or further in daylight conditions without optical tools, when impacting a relatively thin steel target. In another example, the pyrotechnic spotter composition is present in the cavity in an amount of about 1 g to provide a bright light flash that is visible up to about 1000 m in daylight conditions without optical tools, when impacting a relatively thin steel target.
(19) In an exemplary embodiment and as will be discussed in further detail below, advantageously the shouldered post configuration enables compressing the pyrotechnic spotter composition in the cavity while assembling the projectile ogive and ogive nose cap together in one operation. Advantageously, this allows for efficient assembly of the spotter ogive with a compressed pyrotechnic spotter composition disposed therein.
(20) Further, in an exemplary embodiment, the ogive nose cap is made of a metal with good pyrophoric behavior, its particles easily ignite and burn, for example, aluminum, magnesium or titanium. Additionally, in an exemplary embodiment, the ogive nose cap has a relatively short, thin wall section that is adjacent to the pyrotechnic spotter composition and that is less than the diameter of the projectile body section. In one example, the thin wall section of the ogive nose cap has a length of less than about 50% of a medium caliber projectile diameter (e.g., less than about 50% of 30 mm, such as less than about 50% of 25 mm, for example, less than about 50% of 20 mm) and a minimum thickness of about 0.76 mm (e.g., 0.030 inches) to ensure sufficient structural strength for handling, weapon feeding and projectile launch and flight (e.g., firing). As such, advantageously when the spotter ammunition projectile impacts a relatively thin steel plate, for example at a relatively high velocity of about Mach 1, the ogive nose cap rapidly deforms and bursts, causing intense heating and sparking to occur and thereby reliably igniting the pyrotechnic spotter composition in front of the target before the spotter ammunition projectile passes through the target.
(21) Additionally, in an exemplary embodiment, the spotter ammunition projectile includes one of an O-ring or lacquer that sealingly interfaces between the shoulder of the projectile ogive and the ogive nose cap. Advantageously, this ensures that the pyrotechnic spotter composition is fully sealed from potential humid storage conditions for reliable ignition and flash intensity.
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(23) At a proximal end portion 28 of the cartridge case 14 is an annular extraction groove 30, a primer pocket 32, a flash hole 34 for providing fluid communication between the primer pocket 32 and the internal volume 20. A primer 36 is disposed in the primer pocket 32. The primer 36 is ignitable when the firearm 11 is fired to ignite the propellant 21 to produce a propellant gas that drives the spotter ammunition projectile 12 from the case mouth portion 26 through the barrel 13 of the firearm 11 in the distal direction 22.
(24) The spotter ammunition projectile 12 may be a small caliber projectile, a medium caliber projectile, or a large caliber projectile. In an exemplary embodiment, the spotter ammunition projectile 12 is a medium caliber projectile. Non-limiting examples of medium caliber projectiles include 20 mm caliber projectiles, 25 mm caliber projectiles, 30 mm caliber projectiles, 35 mm caliber projectiles, and 40 mm caliber projectiles. In an exemplary embodiment, the spotter ammunition projectile 12 is a large caliber projectile. Non-limiting examples of large caliber projectiles include 57 mm caliber projectiles, 76 mm caliber projectiles, 105 mm caliber projectiles, 120 mm caliber projectiles, and 155 mm caliber projectiles.
(25) As illustrated, the spotter ammunition projectile 12 includes a projectile body section 38 that is disposed in the case mouth portion 26. The projectile body section 38 has a generally cylindrical shape extending in the distal direction 22 about the longitudinal axis 24 from a body proximal end portion 39 to a body distal end portion 40. Disposed between the body proximal end portion 39 and the body distal end portion 40 are annular grooves 42 and 44 and a driving band 46. The driving band 46 obturate the propellant gazes and transmits the rotation and/or facilitates stable travel of the spotter ammunition projectile 12 through the barrel 13 when the firearm 11 is fired. The driving band 46 may be integrally formed and therefore part of the projectile body section 38, or alternatively, may be a separate component that is disposed about and coupled to the projectile body section 38.
(26) In an exemplary embodiment, a projectile ogive 48 is fastened to (e.g., via threaded engagement 50 or the like) or otherwise couple to the body distal end portion 40. As illustrated, the projectile ogive 48 has an outer ogive surface 52 that tapers in the distal direction 22 towards a shoulder 54 that is disposed about the longitudinal axis 24. In an exemplary embodiment, the shoulder 54 is an annular shoulder that is disposed around and spaced apart from the longitudinal axis 24.
(27) The projectile ogive 48 includes a post 56 that is disposed adjacent to the shoulder 54. The post 56 extends along the longitudinal axis 24 in the distal direction 22 from a post proximal end portion 58 to a post distal end portion 60 that is disposed opposite the post proximal end portion 58. As illustrated, the annular shoulder 54 extends radially outward from a proximal-most end of the post proximal end portion 58. In one example, the post distal end portion 60 is configured as a conical end portion. In one example, the post 56 has a length of about 75% of the nose cap length or can be made shorter to introduce more pyrotechnic spotter composition as required. In an exemplary embodiment, the nose cap length must be sufficient to engage an adequate press fit with the post 56 and have enough internal volume for the deposited spotter bulk power, before compression.
(28) In an exemplary embodiment, an ogive nose cap 62 is disposed adjacent to the shoulder 54 and has a wall 64 (e.g., conical wall or the like) that extends in the distal direction 22 from adjacent to the shoulder 54 to a tip end portion 66 to cover the post 56. As illustrated, the wall 64 of the ogive nose cap 62 has an inner nose cap surface 68 that faces towards the post 56 and an outer nose cap surface 70 that is disposed on a side opposite the inner nose cap surface 68. The outer nose cap surface 70 tapers in the distal direction 22 towards the longitudinal axis 24 to the tip end portion 66. In an exemplary embodiment, the ogive nose cap 62 is formed of aluminum or an aluminum alloy, magnesium or a magnesium alloy, titanium or a titanium alloy. In one example, the ogive nose cap 62 is formed of aluminum or an aluminum alloy.
(29) In an exemplary embodiment, the post 56 and the ogive nose cap 62 are cooperatively configured to define a cavity 72 between at least a portion of the post 56 and the inner nose cap surface 68. As illustrated, the cavity 72 is disposed between the post distal end portion 60 and the inner nose cap surface 68.
(30) A pyrotechnic spotter composition 74 is disposed in the cavity 72. The pyrotechnic spotter composition 74 provides a bright light flash when the spotter ammunition projectile 12 hits a target. As will be discussed in further detail below, the pyrotechnic spotter composition 74 is in a form of a compressed powder. In an exemplary embodiment, the pyrotechnic spotter composition 74 is a magnesium-based powder composition including magnesium, an accelerant to accelerate combustion of the magnesium, and a binder. In one example, the pyrotechnic spotter composition 74 includes magnesium powder, providing the flash, present in an amount of about 60 wt. %, potassium nitrate, accelerating the combustion, present in an amount of about 35 wt. %, along with a powder binder present in an amount of about 5 wt. %, based on the total weight of the pyrotechnic spotter composition 74. Alternatively, the pyrotechnic spotter composition 74 may be any other pyrotechnic spotter composition known to those of skill in the art. In an exemplary embodiment, the pyrotechnic spotter composition 74 is present in the cavity 72 in an amount of from about 0.5 g to about 1.5 g.
(31) In an exemplary embodiment, to ensure that the ogive nose cap 62 rapidly deforms when impacting a target to reliably ignite the pyrotechnic spotter composition 74 in front of the target, and yet to have sufficient structural integrity for handling, firing, and the like, the wall 64 of the ogive nose cap 62 defines a conical-shaped nose cap having a thick wall section 76 and a thin wall section 78. The thin wall section 78 is thinner than the thick wall section 76 and is disposed distally from the thick wall section 76. As illustrated, the pyrotechnic spotter composition 74 is disposed in the cavity 72 adjacent to the thin wall section 78.
(32) In an exemplary embodiment, the inner nose cap surface 68 of the thin wall section 78 is spatially registered with the outer nose cap surface 70 and accordingly, likewise tapers in the distal direction 22 towards the longitudinal axis 24. In an exemplary embodiment, the thin wall section 78 has a thickness of from about 0.7 mm to about 0.8 mm, for example about 0.76 mm and a length of less than about 50% of the caliber projectile diameter (e.g., diameter of the projectile body section 38) of the spotter ammunition projectile 12. Some non-limiting examples of ranges for the length include for a 20 mm projectile-about 7 to 10 mm, for a 30 mm projectile-about 10 to 15 mm, and for a 57 mm projectile-about 20 to 27 mm.
(33) In an exemplary embodiment, the inner nose cap surface 68 of the thick wall section 76 is substantially parallel to the longitudinal axis 24. Accordingly, the cross-section of the wall 64 defined between the inner and outer nose cap surfaces 68 and 70 of the thick wall section 76 varies along a length of the longitudinal axis 24. As illustrated, the variable cross-section of the wall 64 of the thick wall section 76 flares in a proximal direction (direction opposite the distal direction 22) along a length of the longitudinal axis 24. As will be discussed in further detail below, the inner nose cap surface 68 of the thick wall section 76 is in direct contact with an outer surface of the post 56 proximal to the post distal end portion 60 to form a press fit with the post 56, which secures the ogive nose cap 62 to the projectile ogive 48.
(34) Referring also to
(35) Referring to
(36) Referring to
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(38) Referring to
(39) The pyrotechnic spotter composition 74 is deposited (STEP 104) adjacent to the inner nose cap surface 68 of the wall 64 of the ogive nose cap 62. The ogive nose cap 62 is disposed (STEP 106) adjacent to the shoulder 54 such that the wall 64 covers the post 56 and the inner nose cap surface 68 faces towards the post 56. In an exemplary embodiment, the post 56 and the ogive nose cap 62 are cooperatively configured to define the cavity 72 therebetween and the pyrotechnic spotter composition 74 is disposed in the cavity 72.
(40) In an exemplary embodiment, the wall 64 of the ogive nose cap 62 has the thick wall section 76. Disposing (STEP 106) includes press fitting the projectile ogive 48 and the ogive nose cap 62 together such that the inner nose cap surface 68 of the thick wall section 76 advances over and is in direct contact with an outer surface of the post 56 to form a press fit that secures the ogive nose cap 62 to the projectile ogive 48.
(41) While at least one exemplary embodiment has been presented in the foregoing detailed description of the disclosure, it should be appreciated that a vast number of variations exist. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the disclosure in any way. Rather, the foregoing detailed description will provide those skilled in the art with a convenient road map for implementing an exemplary embodiment of the disclosure. It being understood that various changes may be made in the function and arrangement of elements described in an exemplary embodiment without departing from the scope of the disclosure as set forth in the appended claims.