EP2885601A1 - Shell accelerator - Google Patents

Shell accelerator

Info

Publication number
EP2885601A1
EP2885601A1 EP13829477.2A EP13829477A EP2885601A1 EP 2885601 A1 EP2885601 A1 EP 2885601A1 EP 13829477 A EP13829477 A EP 13829477A EP 2885601 A1 EP2885601 A1 EP 2885601A1
Authority
EP
European Patent Office
Prior art keywords
projectile
gun barrel
shell
deployed
explosive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13829477.2A
Other languages
German (de)
French (fr)
Other versions
EP2885601A4 (en
Inventor
Gil Weisbrod
Menachem Rotkopf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rafael Advanced Defense Systems Ltd
Original Assignee
Rafael Advanced Defense Systems Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rafael Advanced Defense Systems Ltd filed Critical Rafael Advanced Defense Systems Ltd
Publication of EP2885601A1 publication Critical patent/EP2885601A1/en
Publication of EP2885601A4 publication Critical patent/EP2885601A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/02—Composite barrels, i.e. barrels having multiple layers, e.g. of different materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/04—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of armour-piercing type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/36—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information
    • F42B12/56—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information for dispensing discrete solid bodies
    • F42B12/58—Cluster or cargo ammunition, i.e. projectiles containing one or more submissiles
    • F42B12/62—Cluster or cargo ammunition, i.e. projectiles containing one or more submissiles the submissiles being ejected parallel to the longitudinal axis of the projectile
    • F42B12/625—Cluster or cargo ammunition, i.e. projectiles containing one or more submissiles the submissiles being ejected parallel to the longitudinal axis of the projectile a single submissile arranged in a carrier missile for being launched or accelerated coaxially; Coaxial tandem arrangement of missiles which are active in the target one after the other

Definitions

  • the present invention relates to projectiles and, in particular, it concerns a projectile such as a bomb which includes a shell fired from a gun barrel.
  • Rocket motors typically require burn times of several tens of milliseconds in order to achieve their maximum velocity.
  • a terminal-phase booster rocket must therefore be ignited at a relatively large altitude (distance to the target).
  • the extended flight of the payioad after actuation of the rocket motor may lead to problems of lack of accuracy and/or change of attack angle relative to the original path of the main projectile.
  • the present invention is a projectile such as a bomb which includes a shell fired from a gun barrel.
  • a projectile selected from the group comprising: a bomb and a missile, the projectile comprising: (a) a housing configured to travel stably through the air; (b) a gun barrel deployed within the housing; (c) a shell deployed within the gun barrel, the shell containing an explosive charge; and (d) a quantity of black powder or other low-explosive deployed for Firing the shell from the gun barrel.
  • the housing has a central axis, and the gun barrel is aligned with, or parallel to, the central axis.
  • the housing has an outer diameter
  • the gun barrel has an inner diameter at least half of the housing outer diameter
  • the black powder or other low-explosive is configured to have a burn-time of not more than 10 milliseconds.
  • the black powder or other low-explosive is configured to generate a pressure within the gun barrel of at least 1000 atmospheres.
  • the gun barrel comprises: (a) a metallic liner; and (b) composite material reinforcement deployed around the metallic liner.
  • At least one of the metallic liner and the composite material reinforcement is formed with a graduated thickness, having a maximum thickness at a rear end of the gun barrel and a reduced thickness towards a front end of the gun barrel.
  • at least part of the black powder or other low-explosive is initially stored within a metallic pressure vessel attached to, or integrally formed with, a rear end of the gun barrel.
  • a total mass of the gun barrel is between one and ten times a mass of the shell
  • a piston deployed within the gun barrel between the black powder or other low-explosive and the shell.
  • a fuzing system associated with the projectile and configured to ignite the black powder or other low-explosive when the projectile is a given distance from a target thereby firing the shell towards the target.
  • the projectile is a bomb.
  • a projectile selected from the group comprising: a bomb and a missile, the projectile comprising: (a) a housing configured to travel stably through the air; (b) a gun barrel deployed within the housing; and (c) a shell deployed within the gun barrel, for firing from the gun barrel.
  • FIG. 1 is a schematic representation of the operation of a projectile constructed and operative according to an embodiment of the present invention, immediately after firing a shell towards a target;
  • FIG. 2 is a schematic cross-sectional view of the projectile of FIG. 1;
  • FIG. 3 is an enlarged view of a gun barrel assembly from the projectile of FIG. 2.
  • the present invention is a projectile such as a bomb which includes a shell fired from a gun barrel.
  • FIGS. 1-3 illustrate a projectile, generally designated 10, constructed and operative according to an embodiment of the present invention.
  • the present invention will be illustrated herein with reference to a particularly preferred but non-limiting implementation as a bomb. However, it should be appreciated that the principles of the present invention are applicable to a range of other types of projectile, such as for example a missile.
  • projectile 10 has a housing 12 configured to travel stably through the air, typically formed with suitable fins 12 «. Details of the aerodynamic design and guidance system of the projectile are not relevant to the novel features of the present invention, and will therefore not be described herein. A wide range of suitable projectile designs are well known in the art.
  • a gun barrel 14 in which is deployed a shell 16.
  • Shell 16 preferably contains an explosive charge 18.
  • a quantity of black powder or other low-explosive 20 is preferably deployed for firing the shell from the gun barrel.
  • the cannon-type gun mounted within the projectile of the present invention achieves the desired muzzle speed of shell 16 over a period of no more than about 10 milliseconds (similar to conventional artillery rounds), thereby allowing firing of the shell at significantly lower altitude (or closer range) than is possible with booster rocket-motor driven pay loads.
  • the short range of flight of the shell from the projectile to the target the aforementioned problems of accuracy and change in attack angle are eliminated or greatly ameliorated.
  • a preferred orientation of the gun barrel 14 is aligned with a central axis of housing 12, so that the shell is fired along the "boresight" axis of the IB2013/054657 projectile.
  • an off-axis deployment typically still parallel to the central axis, may be implemented.
  • the dimensions of shell 16 are maximized as much as possible within the limitations of housing 12.
  • an inner diameter of gun barrel 14 is at least half of the outer diameter of housing 12.
  • the present invention preferably employs "black powder", or some other low-explosive material which provides a sufficiently high burn rate.
  • a typical primary rapid combustion propellant is M30 black powder, with G6 and/or G7 powder used as an igniter.
  • Firing of shell 16 results in a pressure within the gun barrel of at least 1000 atmospheres, and typically in the order of several thousand atmospheres.
  • gun barrel 14 is preferably formed from a compound structure including a metallic liner 22 surrounded by composite material reinforcement 24.
  • the peak gas pressure clearly occurs at the beginning of motion of the shell, and drops off as the shell progresses along the barrel. Accordingly, as best seen in FIG.
  • At least one and preferably both of metallic liner 22 and composite material reinforcement 24 are formed with a graduated thickness, having a maximum thickness at a rear end of the gun barrel and a reduced thickness towards a front end of the gun barrel.
  • the rear end of the barrel is preferably enclosed by a metallic pressure vessel 26, typically spherical and formed from steel, attached to, or integrally fomed with, the rear end of the gun barrel, within which at least part of the black powder or other low- explosive 20 is initially stored.
  • a piston 28 is preferably deployed within gun barrel 14, between the black powder and shell 16, so as to propel the shell along the barrel while protecting the shell from damage.
  • a sabot 32 preferably supports shell 16 during motion along barrel 14 and is discarded thereafter.
  • the reaction against which the high-pressure gases fire the shell is provided primarily by the inertial mass of the gun barrel. Most preferably, a total mass of the gun barrel (including the pressure vessel) is between one and ten times the mass of shell 14.
  • projectile 10 preferably also includes a proximity fuze (not shown) or other suitable fuzing system with an associated initiating device configured to ignite the black powder or other low- explosive 20 when projectile 10 reaches the given distance from the target. Ignition of the explosive charge 18 of shell 16 is typically performed by a separate fuze 30 within shell 16.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)

Abstract

A projectile (bomb or missile) has a housing for travelling stably through the air and a gun barrel deployed within the housing. A shell, deployed within the gun barrel, contains an explosive charge. A quantity of black powder or other low-explosive is deployed for firing the shell from the gun barrel.

Description

Title: Shell Accelerator
FIELD AND BACKGROUND OF THE INVENTION
The present invention relates to projectiles and, in particular, it concerns a projectile such as a bomb which includes a shell fired from a gun barrel.
Various projectiles have been suggested for boosting the speed of at least part of a projectile beyond the normal terminal speed or closing speed of the projectile body. Most commonly, a velocity boost is provided by a rocket motor which accelerates a payioad towards a target. An example of such a device may be found in US patent no. 6540175.
Rocket motors typically require burn times of several tens of milliseconds in order to achieve their maximum velocity. A terminal-phase booster rocket must therefore be ignited at a relatively large altitude (distance to the target). The extended flight of the payioad after actuation of the rocket motor may lead to problems of lack of accuracy and/or change of attack angle relative to the original path of the main projectile. SUMMARY OF THE INVENTION
The present invention is a projectile such as a bomb which includes a shell fired from a gun barrel.
According to the teachings of an embodiment of the present invention there is provided, a projectile selected from the group comprising: a bomb and a missile, the projectile comprising: (a) a housing configured to travel stably through the air; (b) a gun barrel deployed within the housing; (c) a shell deployed within the gun barrel, the shell containing an explosive charge; and (d) a quantity of black powder or other low-explosive deployed for Firing the shell from the gun barrel.
According to a further feature of an embodiment of the present invention, the housing has a central axis, and the gun barrel is aligned with, or parallel to, the central axis.
According to a further feature of an embodiment of the present invention, the housing has an outer diameter, and wherein the gun barrel has an inner diameter at least half of the housing outer diameter.
According to a further feature of an embodiment of the present invention, the black powder or other low-explosive is configured to have a burn-time of not more than 10 milliseconds.
According to a further feature of an embodiment of the present invention, the black powder or other low-explosive is configured to generate a pressure within the gun barrel of at least 1000 atmospheres.
According to a further feature of an embodiment of the present invention, the gun barrel comprises: (a) a metallic liner; and (b) composite material reinforcement deployed around the metallic liner.
According to a further feature of an embodiment of the present invention, at least one of the metallic liner and the composite material reinforcement is formed with a graduated thickness, having a maximum thickness at a rear end of the gun barrel and a reduced thickness towards a front end of the gun barrel. According to a further feature of an embodiment of the present invention, at least part of the black powder or other low-explosive is initially stored within a metallic pressure vessel attached to, or integrally formed with, a rear end of the gun barrel.
According to a further feature of an embodiment of the present invention, a total mass of the gun barrel is between one and ten times a mass of the shell
According to a further feature of an embodiment of the present invention, there is also provided a piston deployed within the gun barrel between the black powder or other low-explosive and the shell.
According to a further feature of an embodiment of the present invention, there is also provided a fuzing system associated with the projectile and configured to ignite the black powder or other low-explosive when the projectile is a given distance from a target thereby firing the shell towards the target.
According to a further feature of an embodiment of the present invention, the projectile is a bomb.
There is also provided according to the teachings of an embodiment of the present invention, a projectile selected from the group comprising: a bomb and a missile, the projectile comprising: (a) a housing configured to travel stably through the air; (b) a gun barrel deployed within the housing; and (c) a shell deployed within the gun barrel, for firing from the gun barrel. IB2013/054657
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is herein described, by way of example only, with reference to the accompanying drawings, wherein:
FIG. 1 is a schematic representation of the operation of a projectile constructed and operative according to an embodiment of the present invention, immediately after firing a shell towards a target;
FIG. 2 is a schematic cross-sectional view of the projectile of FIG. 1; and
FIG. 3 is an enlarged view of a gun barrel assembly from the projectile of FIG. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention is a projectile such as a bomb which includes a shell fired from a gun barrel.
The principles and operation of projectiles according to the present invention may be better understood with reference to the drawings and the accompanying description.
Referring now to the drawings, FIGS. 1-3 illustrate a projectile, generally designated 10, constructed and operative according to an embodiment of the present invention. The present invention will be illustrated herein with reference to a particularly preferred but non-limiting implementation as a bomb. However, it should be appreciated that the principles of the present invention are applicable to a range of other types of projectile, such as for example a missile.
In general terms, projectile 10 has a housing 12 configured to travel stably through the air, typically formed with suitable fins 12«. Details of the aerodynamic design and guidance system of the projectile are not relevant to the novel features of the present invention, and will therefore not be described herein. A wide range of suitable projectile designs are well known in the art.
Within housing 12 is a gun barrel 14 in which is deployed a shell 16. Shell 16 preferably contains an explosive charge 18. A quantity of black powder or other low-explosive 20 is preferably deployed for firing the shell from the gun barrel.
It is a particular advantage of certain embodiments of the present invention that the cannon-type gun mounted within the projectile of the present invention achieves the desired muzzle speed of shell 16 over a period of no more than about 10 milliseconds (similar to conventional artillery rounds), thereby allowing firing of the shell at significantly lower altitude (or closer range) than is possible with booster rocket-motor driven pay loads. As a result of the short range of flight of the shell from the projectile to the target, the aforementioned problems of accuracy and change in attack angle are eliminated or greatly ameliorated.
A preferred orientation of the gun barrel 14 is aligned with a central axis of housing 12, so that the shell is fired along the "boresight" axis of the IB2013/054657 projectile. In some cases, an off-axis deployment, typically still parallel to the central axis, may be implemented.
In certain particularly preferred implementations, the dimensions of shell 16 are maximized as much as possible within the limitations of housing 12. Thus, in some cases, an inner diameter of gun barrel 14 is at least half of the outer diameter of housing 12.
In order to achieve the aforementioned short burn time, the present invention preferably employs "black powder", or some other low-explosive material which provides a sufficiently high burn rate. A typical primary rapid combustion propellant is M30 black powder, with G6 and/or G7 powder used as an igniter.
Firing of shell 16 according to preferred parameters of the present invention results in a pressure within the gun barrel of at least 1000 atmospheres, and typically in the order of several thousand atmospheres. In order to withstand such pressures while remaining within acceptable weight limits for the appropriate class of projectiles (e.g., air-launched bomb or missile), gun barrel 14 is preferably formed from a compound structure including a metallic liner 22 surrounded by composite material reinforcement 24. The peak gas pressure clearly occurs at the beginning of motion of the shell, and drops off as the shell progresses along the barrel. Accordingly, as best seen in FIG. 3, at least one and preferably both of metallic liner 22 and composite material reinforcement 24 are formed with a graduated thickness, having a maximum thickness at a rear end of the gun barrel and a reduced thickness towards a front end of the gun barrel. The rear end of the barrel is preferably enclosed by a metallic pressure vessel 26, typically spherical and formed from steel, attached to, or integrally fomed with, the rear end of the gun barrel, within which at least part of the black powder or other low- explosive 20 is initially stored. A piston 28 is preferably deployed within gun barrel 14, between the black powder and shell 16, so as to propel the shell along the barrel while protecting the shell from damage. A sabot 32 preferably supports shell 16 during motion along barrel 14 and is discarded thereafter.
The reaction against which the high-pressure gases fire the shell is provided primarily by the inertial mass of the gun barrel. Most preferably, a total mass of the gun barrel (including the pressure vessel) is between one and ten times the mass of shell 14.
As mentioned, shell 14 is preferably fired at a given predefined stand-off distance from the intended target. To this end, projectile 10 preferably also includes a proximity fuze (not shown) or other suitable fuzing system with an associated initiating device configured to ignite the black powder or other low- explosive 20 when projectile 10 reaches the given distance from the target. Ignition of the explosive charge 18 of shell 16 is typically performed by a separate fuze 30 within shell 16. It will be appreciated that the above descriptions are intended only to serve as examples, and that many other embodiments are possible within the scope of the present invention as defined in the appended claims.

Claims

WHAT IS CLAIMED IS:
1. A projectile selected from the group comprising: a bomb and a missile, the projectile comprising:
(a) a housing configured to travel stably through the air;
(b) a gun barrel deployed within said housing;
(c) a shell deployed within said gun barrel, said shell containing an explosive charge; and
(d) a quantity of black powder or other low-explosive deployed for firing said shell from said gun barrel.
2. The projectile of claim 1, wherein said housing has a central axis, and wherein said gun barrel is aligned with, or parallel to, said central axis.
3. The projectile of claim 1, wherein said housing has an outer diameter, and wherein said gun barrel has an inner diameter at least half of said housing outer diameter.
4. The projectile of claim 1, wherein said black powder or other low-explosive is configured to have a burn-time of not more than 10 milliseconds.
5. The projectile of claim 1, wherein said black powder or other low-explosive is configured to generate a pressure within said gun barrel of at least 1000 atmospheres.
6. The projectile of claim 1, wherein said gun barrel comprises:
(a) a metallic liner; and
(b) composite material reinforcement deployed around said metallic liner.
7. The projectile of claim 6, wherein at least one of said metallic liner and said composite material reinforcement is formed with a graduated thickness, having a maximum thickness at a rear end of said gun barrel and a reduced thickness towards a front end of said gun barrel.
8. The projectile of claim 6, wherein at least part of said black powder or other low-explosive is initially stored within a metallic pressure vessel attached to, or integrally formed with, a rear end of said gun barrel.
9. The projectile of claim 6, wherein a total mass of said gun barrel is between one and ten times a mass of said shell.
10. The projectile of claim 1, further comprising a piston deployed within said gun barrel between said black powder or other low-explosive and said shell.
1 1. The projectile of claim 1, further comprising a fuzing system associated with the projectile and configured to ignite said black powder or other low-explosive when the projectile is a given distance from a target thereby firing said shell towards the target.
12. The projectile of claim 1, wherein the projectile is a bomb.
13. A projectile selected from the group comprising: a bomb and a missile, the projectile comprising:
(a) a housing configured to travel stably through the air;
(b) a gun barrel deployed within said housing; and
(c) a shell deployed within said gun barrel, for firing from said gun barrel.
EP13829477.2A 2012-08-14 2013-06-06 Shell accelerator Withdrawn EP2885601A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL221460A IL221460A (en) 2012-08-14 2012-08-14 Shell accelerator
PCT/IB2013/054657 WO2014027257A1 (en) 2012-08-14 2013-06-06 Shell accelerator

Publications (2)

Publication Number Publication Date
EP2885601A1 true EP2885601A1 (en) 2015-06-24
EP2885601A4 EP2885601A4 (en) 2016-07-20

Family

ID=50101284

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13829477.2A Withdrawn EP2885601A4 (en) 2012-08-14 2013-06-06 Shell accelerator

Country Status (5)

Country Link
EP (1) EP2885601A4 (en)
KR (1) KR20150041781A (en)
IL (1) IL221460A (en)
SG (1) SG11201500307TA (en)
WO (1) WO2014027257A1 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR493570A (en) * 1916-10-16 1919-08-13 Bento Caeiro Method and device for increasing the range of projectiles
BE676051A (en) * 1965-02-12 1966-06-16
FR2472168A1 (en) * 1979-12-19 1981-06-26 Serat Outer casing for projectile - includes auxiliary charge to boost speed before impact to ensure penetration of target
US5341719A (en) * 1992-12-14 1994-08-30 General Electric Company Multi-layer composite gun barrel
DE19535218C1 (en) * 1995-09-22 1997-02-27 Diehl Gmbh & Co Ballistic projectile
US6845718B2 (en) * 2002-12-18 2005-01-25 Lockheed Martin Corporation Projectile capable of propelling a penetrator therefrom and method of using same
FR2871226B1 (en) * 2004-06-08 2006-08-18 Tda Armements Sas Soc Par Acti PROJECTILE, IN PARTICULAR ANTI-INFRASTRUCTURE PENETRATION BOMB AND METHOD OF PENETRATING SUCH A PROJECTILE THROUGH A WALL

Also Published As

Publication number Publication date
WO2014027257A1 (en) 2014-02-20
KR20150041781A (en) 2015-04-17
EP2885601A4 (en) 2016-07-20
IL221460A (en) 2016-11-30
SG11201500307TA (en) 2015-03-30

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