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EP0053421A1 - Projectile for a centrifugal sling weapon - Google Patents

Projectile for a centrifugal sling weapon Download PDF

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Publication number
EP0053421A1
EP0053421A1 EP81201299A EP81201299A EP0053421A1 EP 0053421 A1 EP0053421 A1 EP 0053421A1 EP 81201299 A EP81201299 A EP 81201299A EP 81201299 A EP81201299 A EP 81201299A EP 0053421 A1 EP0053421 A1 EP 0053421A1
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Prior art keywords
projectile
tail
gravity
center
speed
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French (fr)
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EP0053421B1 (en
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Léon Rutten
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B6/00—Projectiles or missiles specially adapted for projection without use of explosive or combustible propellant charge, e.g. for blow guns, bows or crossbows, hand-held spring or air guns
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
    • F41B3/00—Sling weapons
    • F41B3/04—Centrifugal sling apparatus

Definitions

  • the present invention relates to a projectile for a centrifugal launcher.
  • Centrifugal launchers have been known for more than a century in different fields: shot blasting machines, sport, toys, weapons.
  • the present invention relates only to the field of armaments.
  • the resulting speed is therefore a composition of a radial speed and a tangential speed, these two speeds being perpendicular to each other.
  • the calculation makes it possible to demonstrate that for a steel ball of 20 mm in diameter (steel having an average admissible stress of 100 kg / mm2), launched by a bladed cannon of 475 mm so as to have a ejection speed of 800 m / sec., the Coriolis force reaches 4400 kg.
  • the contact of Herz would cause under these conditions a deformation of the ball by a meridian plate with an area of 44 mm2.
  • the ejection speed should be limited well below 500 m / sec.
  • the spherical shape must therefore be discarded for a modern projectile, especially since it is difficult to see how a projectile of this shape could be equipped with an explosive charge with an impact rocket.
  • the object of the invention is therefore to provide a projectile as close as possible to projectiles for conventional weapons, but adapted to be effectively used in a centrifugal machine equipped with a bladed gun.
  • a projectile of the type comprising an ogival head, a body and a tail of decreasing section, characterized in that said body is cylindrical and that the mass of said tail is chosen such that the the projectile's center of gravity is located in the fictitious base of said body close to the tail, respectively in the immediate vicinity of this base, while the shape of said tail is chosen so that no point on the surface of the latter touches the wall of the gun vane, particularly during the entire ejection of the projectile.
  • the dual condition of the position of the projectile's center of gravity and the shape of the tail prevents the projectile from tipping over when it is ejected.
  • the projectile represented in FIG. 1 therefore comprises an ogival head 1, a cylindrical body 2 and a tail of decreasing section 3. These three parts comprise recesses, generally designated at 4, intended to collaborate in the correct positioning of the center of gravity G.
  • the projectile made of steel, has a length of 92 mm, a maximum diameter of 20 mm (body 2) and a weight of 122 gr.
  • the limit shape of the generator of the tail 3 making it possible to avoid any contact with the vane-barrel 5 is defined by a calculated envelope curve whose equation, in the system of axes of FIG. 2, is:
  • the angle p is the angle between the direction of the resulting speed V R and the tangential speed V.
  • This angle depends on the coefficient of friction between the shell and the bore of the barrel.
  • the envelope curve is dependent on the dimensions r l , r 2 of the machine, the size and the coefficient of friction. Thus, for a given machine, whatever the speed, the envelope curve is fixed.
  • the launching of the projectile at speeds equal to or greater than 800 m / sec. may give rise to viscous cutouts during translation in the vane-barrel as well as to a surface plasticization at the exit of the latter, it is advisable to give the body 2 an appropriate surface treatment, for example copper.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Toys (AREA)
  • Control Of Vending Devices And Auxiliary Devices For Vending Devices (AREA)
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  • Chair Legs, Seat Parts, And Backrests (AREA)
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  • Soft Magnetic Materials (AREA)
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Abstract

Un projectile pour un lanceur centrifuge à aubage-canon [5], est du type comprenant une tête ogivale [1], un corps [2] et une queue de section décroissante [3]. Le corps [2] est cylindrique et la masse de ladite queue [3] est choisio telle que le centre de gravité G du projectile est situé dans la base fictive dudit corps [2] voisine de la queue [3], respectivement au voisinage immédiat de cette base, tandis que la forme de ladite queue [3] est choisie de sorte qu'aucun point de la surface de cotte dernière ne touche la paroi de l'aubage-canon [5], particulièrement durant toute l'injection du projectile.A projectile for a centrifugal launcher with bladed cannon [5], is of the type comprising an ogival head [1], a body [2] and a tail of decreasing section [3]. The body [2] is cylindrical and the mass of said tail [3] is chosen such that the center of gravity G of the projectile is located in the fictitious base of said body [2] near the tail [3], respectively in the immediate vicinity of this base, while the shape of said tail [3] is chosen so that no point on the surface of the last coat touches the wall of the gun barrel [5], particularly during the entire injection of the projectile .

Description

La présente invention concerne un projectile pour lanceur centrifuge.The present invention relates to a projectile for a centrifugal launcher.

Des lanceurs centrifuges sont connus depuis plus d'un siècle dans différents domaines : grenailleuses, sport, jouets, armement.Centrifugal launchers have been known for more than a century in different fields: shot blasting machines, sport, toys, weapons.

La présente invention ne concerne que le domaine de l'armement.The present invention relates only to the field of armaments.

Dans ce domaine, des vitesses de départ importantes (800 m/sec. et plus) sont actuellement exigées.In this area, significant starting speeds (800 m / sec. And more) are currently required.

Pour atteindre de telles vitesses élevées tout en conservant au lanceur des dimensions relativement compactes, il est nécessaire de soumettre le projectile à l'accélération centrifuge ou radiale et à l'accélération de Coriolis perpendiculaire à la première. La vitesse résultante est donc une composition d'une vitesse radiale et d'une vitesse tangentielle, ces deux vitesses étant perpendiculaires entre elles.To reach such high speeds while retaining relatively compact dimensions for the launcher, it is necessary to subject the projectile to centrifugal or radial acceleration and to Coriolis acceleration perpendicular to the first. The resulting speed is therefore a composition of a radial speed and a tangential speed, these two speeds being perpendicular to each other.

Il s'ensuit que l'on préférera un lanceur à aubage-canon, dont un exemple est décrit dans une autre demande de brevet du Demandeur, déposée simultanément avec la présente.It follows that a bladder-gun launcher is preferred, an example of which is described in another patent application of the Applicant, filed simultaneously with the present.

Une exactitude rigoureuse de la trajectoire de sortie du projectile étant évidemment requise, ceci implique des diffi- cultes considérables au niveau de l'alimentation, qui doit également être rigoureuse et dans l'espace et dans le temps.As rigorous accuracy of the projectile's exit trajectory is obviously required, this implies difficulties. considerable cults in terms of food, which must also be rigorous in space and time.

Pour cette raison, la grande majorité des solutions proposées à ce jour fait appel à des projectiles sphériques, respectivement des billes.For this reason, the vast majority of the solutions proposed to date use spherical projectiles, respectively balls.

Or, la combinaison d'une vitesse de rotation et d'une vitesse radiale entraîne une accélération dite de Coriolis.However, the combination of a rotational speed and a radial speed leads to a so-called Coriolis acceleration.

A titre d'exemple, le calcul permet de démontrer que pour une bille en acier de 20 mm de diamètre (acier ayant une contrainte admissible moyenne de 100 kg/mm2), lancée par un aubage-canon de 475 mm de manière à avoir une vitesse d'éjection de 800 m/sec., la force de Coriolis atteint 4400 kg. Le contact de Herz provoquerait dans ces conditions une déformation de la bille par un plat méridien d'une surface de 44 mm2. Comme ceci est inadmissible, il est clair qu'il faudrait limiter la vitesse d'éjection bien en dessous de 500 m/sec.By way of example, the calculation makes it possible to demonstrate that for a steel ball of 20 mm in diameter (steel having an average admissible stress of 100 kg / mm2), launched by a bladed cannon of 475 mm so as to have a ejection speed of 800 m / sec., the Coriolis force reaches 4400 kg. The contact of Herz would cause under these conditions a deformation of the ball by a meridian plate with an area of 44 mm2. As this is inadmissible, it is clear that the ejection speed should be limited well below 500 m / sec.

La forme sphérique doit donc être écartée pour un projectile moderne, d'autant plus que l'on voit mal comment on pourrait équiper un projectile de cette forme d'une charge explosive avec fusée d'impact.The spherical shape must therefore be discarded for a modern projectile, especially since it is difficult to see how a projectile of this shape could be equipped with an explosive charge with an impact rocket.

Le but de l'invention est donc de fournir un projectile le plus proche possible des projectiles pour armes conventionnelles, mais adapté pour être efficacement utilisé dans une machine centrifuge équipée d'un aubage-canon.The object of the invention is therefore to provide a projectile as close as possible to projectiles for conventional weapons, but adapted to be effectively used in a centrifugal machine equipped with a bladed gun.

Ce but est atteint, conformément à l'invention, par un projectile du type comprenant une tête ogivale, un corps et une queue de section décroissante, caractérisé en ce que ledit corps est cylindrique et que la masse de ladite queue est choisie telle que le centre de gravité du projectile est situé dans la base fictive dudit corps voisine de la queue, respectivement au voisinage immédiat de cette base, tandis que la forme de ladite queue est choisie de sorte qu'aucun point de la surface de cette dernière ne touche la paroi de l'aubage-canon, particulièrement durant toute l'éjection du projectile.This object is achieved, in accordance with the invention, by a projectile of the type comprising an ogival head, a body and a tail of decreasing section, characterized in that said body is cylindrical and that the mass of said tail is chosen such that the the projectile's center of gravity is located in the fictitious base of said body close to the tail, respectively in the immediate vicinity of this base, while the shape of said tail is chosen so that no point on the surface of the latter touches the wall of the gun vane, particularly during the entire ejection of the projectile.

Le corps cylindrique du projectile selon l'invention est destiné à reprendre la force de Coriolis. Cette dernière est donnée en tout point considéré par :

Figure imgb0001
dans laquelle :

  • K est une constante
  • m est la masse du projectile
  • w la vitesse angulaire du projectile
  • r le rayon du point considéré
  • f(η) est une fonction du coefficient de frottement n.
The cylindrical body of the projectile according to the invention is intended to recover the force of Coriolis. The latter is given at any point considered by:
Figure imgb0001
 in which :
  • K is a constant
  • m is the mass of the projectile
  • w the angular velocity of the projectile
  • r the radius of the point considered
  • f (η) is a function of the coefficient of friction n.

Pour un projectile de 122 gr, éjecté à 800 m/sec. par un aubage-canon (calibre 20 mm) d'une longueur de 475 mm, avec un n = 0,2, la force de Coriolis atteint 16427 kg. On voit donc l'intérêt de la forme cylindrique du corps selon l'invention.For a 122 gr projectile, ejected at 800 m / sec. by a gun barrel (20 mm caliber) with a length of 475 mm, with an n = 0.2, the Coriolis force reaches 16,427 kg. We therefore see the advantage of the cylindrical shape of the body according to the invention.

La double condition de la position du centre de gravité du projectile et de la forme de la queue évite tout basculement du projectile lors de son éjection.The dual condition of the position of the projectile's center of gravity and the shape of the tail prevents the projectile from tipping over when it is ejected.

Pour plus de clarté, la description sera poursuivie avec référence aux dessins annexés, dans lesquels :

  • la figure 1 montre un projectile selon l'invention; et
  • la figure 2 est relative à la forme de la queue du projectile ainsi qu'à l'importance de la position du centre de gravité.
For clarity, the description will be continued with reference to the accompanying drawings, in which:
  • Figure 1 shows a projectile according to the invention; and
  • Figure 2 relates to the shape of the tail of the projectile and the importance of the position of the center of gravity.

Le projectile représenté à la figure 1 comporte donc une tête ogivale 1, un corps cylindrique 2 et une queue de section décroissante 3. Ces trois parties comportent des évidements, généralement désignés en 4, destinés à collaborer au positionnement correct du centre de gravité G. Dans cet exemple concret, le projectile, réalisé en acier, a une longueur de 92 mm, un diamètre maximum de 20 mm (corps 2) et un poids de 122 gr.The projectile represented in FIG. 1 therefore comprises an ogival head 1, a cylindrical body 2 and a tail of decreasing section 3. These three parts comprise recesses, generally designated at 4, intended to collaborate in the correct positioning of the center of gravity G. In this example concrete, the projectile, made of steel, has a length of 92 mm, a maximum diameter of 20 mm (body 2) and a weight of 122 gr.

Pour bien comprendre l'effet de basculement et surtout le couple qui en résulte, la figure 2 donne une bonne représentation du phénomène. Si une erreur "6" sur l'emplacement du centre de poussée ou centre de gravité existe, un couple Ft.δ en résultera de suite. Pour fixer les idées, une erreur δ = 0,1 mm donne un couple (à la sortie du canon) C = 16400.0,1.10-3 = 1,64 kgm. Cette dernière valeur, bien qu'élevée, ne donnera que peu d'effet sur l'obus lui-même. Pour chiffrer les valeurs des rotations, un petit calcul s'impose. En effet, en considérant l'obus comme un cylindre (d'acier) équivalent de 80 mm de long, d'un diamètre équivalent de 15,77 mm (ceci pour respecter le poids de 122 gr), on a le moment

Figure imgb0002
Figure imgb0003
D'où
Figure imgb0004
 To fully understand the tilting effect and especially the resulting torque, Figure 2 gives a good representation of the phenomenon. If an error "6" on the location of the center of thrust or center of gravity exists, a torque F t .δ will result immediately. To fix the ideas, an error δ = 0.1 mm gives a torque (at the exit of the barrel) C = 16400.0,1.10 -3 = 1.64 kgm. The latter value, although high, will have little effect on the shell itself. To calculate the values of the rotations, a small calculation is necessary. Indeed, considering the shell as an equivalent (steel) cylinder 80 mm long, with an equivalent diameter of 15.77 mm (this to respect the weight of 122 gr), we have the moment
Figure imgb0002
Figure imgb0003
 From where
Figure imgb0004

Avec VR = 800 m/sec, la sortie de l'obus se fait en 4 degrés environ (pour dégager la queue uniquement). Ceci correspond à un temps calculé ci-après :

Figure imgb0005
Figure imgb0006
D'où
Figure imgb0007
 With V R = 800 m / sec, the shell is removed in approximately 4 degrees (to clear the tail only). This corresponds to a time calculated below:
Figure imgb0005
Figure imgb0006
 From where
Figure imgb0007

La rotation qui en résulterait serait de

Figure imgb0008
The resulting rotation would be
Figure imgb0008

En conclusion, on peut dire que les effets d'une mauvaise position du centre de gravité n'aurait d'influence que pour des "δ" dépassant 1 mm (6 = 2 mm, C = 32,8 kgm, 6= 0,395 degré).In conclusion, we can say that the effects of a bad position of the center of gravity would have an influence only for "δ" exceeding 1 mm (6 = 2 mm, C = 32.8 kgm, 6 = 0.395 degree ).

C'est dans ce sens qu'il faut interprêter l'expression "dans le voisinage immédiat" utilisée ci-avant ainsi que dans la revendication principale.It is in this sense that the expression "in the immediate vicinity" used above as well as in the main claim must be interpreted.

La forme limite de la génératrice de la queue 3 permettant d'éviter tout contact avec l'aubage-canon 5 est définie par une courbe enveloppe calculée dont l'équation, dans le système d'axes de la figure 2, est :

Figure imgb0009
Figure imgb0010
 The limit shape of the generator of the tail 3 making it possible to avoid any contact with the vane-barrel 5 is defined by a calculated envelope curve whose equation, in the system of axes of FIG. 2, is:
Figure imgb0009
Figure imgb0010

L'angle a, exprimé en radians, est l'angle que doit parcourir la turbine (ou canon) pour éjecter complètement la queue de l'obus, l'origine étant prise au moment où le centre de gravité G de l'obus atteint la section droite d'extrémité du canon (rayon r2).

Figure imgb0011

  • B = r2 ou rayon extrême du canon.
  • C = ½ calibre ou rayon du calibre.
  • N en tr/min
  • V est la vitesse tangentielle de l'obus
  • v est la vitesse d'éjection radiale de l'obus.
  • VR est la vitesse résultante du projectile au rayon r2.
The angle a, expressed in radians, is the angle that the turbine (or cannon) must travel to completely eject the tail of the shell, the origin being taken when the center of gravity G of the shell reaches the barrel end cross section (radius r 2 ).
Figure imgb0011
  • B = r 2 or extreme radius of the barrel.
  • C = ½ caliber or radius of the caliber.
  • N in rpm
  • V is the tangential velocity of the shell
  • v is the radial ejection speed of the shell.
  • V R is the resulting velocity of the projectile at radius r 2 .

L'angle p est l'angle entre la direction de la vitesse résultante VR et la vitesse tangentielle V.The angle p is the angle between the direction of the resulting speed V R and the tangential speed V.

Cet angle dépend du coëfficient de frottement entre l'obus et l'alésage du canon.This angle depends on the coefficient of friction between the shell and the bore of the barrel.

Cet angle diminue quand le coëfficient de frottement augmente. Il est maximum pour un coëfficient = 0. On a dans ces conditions.

Figure imgb0012
This angle decreases when the coefficient of friction increases. It is maximum for a coefficient = 0. We have under these conditions.
Figure imgb0012

Dans le cas d'un aubage-canon rectiligne, la valeur maximale de p est donnée pour r1 = O, (r1 = rayon du centre de la section droite la plus centrale) où l'on a

Figure imgb0013
In the case of a rectilinear blading-gun, the maximum value of p is given for r 1 = O, (r 1 = radius of the center of the most central straight section) where one has
Figure imgb0013

A propos des coëfficients A et D, il faut noter que pour une machine donnée (r2 et r1 étant fixés ainsi que le coëfficient de frottement - même si celui-ci est inconnu) sin p est fixé et est une constante or VR est proportionnelle à N d'ou

Figure imgb0014
Regarding the coefficients A and D, it should be noted that for a given machine (r 2 and r 1 being fixed as well as the friction coefficient - even if this is unknown) sin p is fixed and is a constant or V R is proportional to N from where
Figure imgb0014

Le calcul permet de démontrer que VR est lié à N par un système d'équation.The calculation makes it possible to demonstrate that V R is linked to N by a system of equations.

Dès lors, si A et D constantes pour une machine donnée, la courbe enveloppe exprimée par les équations paramétriques x et y est elle aussi fixée (le calibre étant bien sûr fixé aussi).Consequently, if A and D are constant for a given machine, the envelope curve expressed by the parametric equations x and y is also fixed (the caliber being of course also fixed).

Dans ces conditions la courbe enveloppe est dépendante des dimensions rl, r2 de la machine, du calibre et du coëfficient de frottement. Ainsi, pour une machine donnée, quelle que soit la vitesse, la courbe enveloppe est fixée.Under these conditions, the envelope curve is dependent on the dimensions r l , r 2 of the machine, the size and the coefficient of friction. Thus, for a given machine, whatever the speed, the envelope curve is fixed.

On peut étendre ce qui précède en disant que pour un coëfficient de frottement nul la courbe enveloppe trouvée est en plus l'enveloppe de toutes les autres où η ≠ O.We can extend the above by saying that for a zero coefficient of friction the envelope curve found is in addition the envelope of all the others where η ≠ O.

Si l'on suppose en plus que le rayon r1 est égal à O, on obtient dès lors la courbe enveloppe maximum et pour une machine donnée r2 fixé et calibre fixé la courbe enveloppe sera l'enveloppe de tous les cas possible. Ainsi donc la courbe enveloppe ne dépend plus que de r2 et du calibre.If we assume in addition that the radius r 1 is equal to O, we then obtain the maximum envelope curve and for a given machine r 2 fixed and fixed caliber the envelope curve will be the envelope of all possible cases. The envelope curve therefore only depends on r 2 and on the size.

Dans ces conditions :

Figure imgb0015
Figure imgb0016
a en radian.In these conditions :
Figure imgb0015
Figure imgb0016
 has in radian.

Par exemple, pour un rayon donné de 475 mm et un calibre de 20 mm soit C = 10 mm, on peut calculer point à point la courbe enveloppe limite. La courbe adoptée en pratique pour des facilités d'usinage peut se situer plus près de l'axe du projectile, mais elle ne pourrait dépasser ladite courbe limite où f = O et rl = O.For example, for a given radius of 475 mm and a caliber of 20 mm, ie C = 10 mm, we can calculate point by point the boundary envelope curve. The curve adopted in practice for machining facilities may be located closer to the axis of the projectile, but it could not exceed said limit curve where f = O and r l = O.

En pratique, cette dernière condition imposera de rester bien près de cette courbe limite, par exemple en en prenant la corde ou une parallèle à celle-ci. Ceci est d'autant plus vrai dans le cas où la tête 1 doit être équipée d'une fusée et le corps 2 contenir une charge explosive.In practice, this last condition will require staying close to this limit curve, for example by taking the rope or a parallel to it. This is all the more true in the case where the head 1 must be equipped with a rocket and the body 2 contain an explosive charge.

A remarquer que la valeur maximale de l'angle µ (45° pour η = O et r1 = O) mentionnée ci-dessus pourrait être dépassée pour des aubages-canon non rectilignes, capables d'augmenter sensiblement la vitesse d'éjection radiale v et, par conséquent, la vitesse résultante VR de l'obus.Note that the maximum value of the angle µ (45 ° for η = O and r 1 = O) mentioned above could be exceeded for non-rectilinear cannon vane, capable of significantly increasing the speed of radial ejection v and, consequently, the resulting speed V R of the shell.

Le lancement du projectile à des vitesses égales ou supérieures à 800 m/sec. pouvant donner lieu à des arranchements visqueux durant la translation dans l'aubage-canon ainsi qu'à une plastification superficielle à la sortie de ce dernier, il est conseillé de donner au corps 2 un traitement superficiel appropriée, au cuivre par exemple.The launching of the projectile at speeds equal to or greater than 800 m / sec. may give rise to viscous cutouts during translation in the vane-barrel as well as to a surface plasticization at the exit of the latter, it is advisable to give the body 2 an appropriate surface treatment, for example copper.

Claims (4)

1.- Projectile pour lanceur centrifuge à aubage-canon (5), du type comprenant une tête ogivale (1), un corps (2) et une queue de section décroissante (3), caractérisé en ce que ledit corps (2) est cylindrique et que la masse de ladite queue (3) est choisie telle que le centre de gravité du projectile est situé dans la base fictive dudit corps (2) voisine de la queue (3), respectivement au voisinage immédiat de cette base, tandis que la forme de ladite queue (3) est choisie de sorte qu'aucun point de la surface de cette dernière ne touche la paroi de l'aubage- canon (5), particulièrement durant toute l'injection du projectile.1.- Projectile for centrifugal launcher with bladder-cannon (5), of the type comprising an ogival head (1), a body (2) and a tail of decreasing section (3), characterized in that said body (2) is cylindrical and the mass of said tail (3) is chosen such that the center of gravity of the projectile is located in the fictitious base of said body (2) adjacent to the tail (3), respectively in the immediate vicinity of this base, while the shape of said tail (3) is chosen so that no point on the surface of the latter touches the wall of the gun vane (5), particularly during the entire injection of the projectile. 2.- Projectile selon la revendication 1, caractérisé en ce que son centre de gravité ne s'écarte pas à plus de 1 à 1,5 mm dudit plan fictif.2.- Projectile according to claim 1, characterized in that its center of gravity does not deviate by more than 1 to 1.5 mm from said fictitious plane. 3.- Projectile selon la revendication 1, caractérisé en ce que la forme limite admissible de la génératice de la queue (3) - dans un système d'axes cartésien situé dans un plan axial du projectile, où l'axe des x se confond avec l'axe du projectile et l'axe des y est situé à la jonction dudit corps (2) et de ladite queue (3) - est définie par
Figure imgb0017
Figure imgb0018
où
Figure imgb0019
 µ = artg
Figure imgb0020
 v = vitesse d'éjection radiale m/sec V = vitesse tangentielle VR = vitesse résultante N en tr/min B = rayon extrême du canon = r2 C = ½ calibre ou rayon du calibre 3.- Projectile according to claim 1, characterized in that the admissible limit shape of the generatice of the tail (3) - in a Cartesian axis system located in an axial plane of the projectile, where the x-axis merges with the axis of the projectile and the y-axis is located at the junction of said body (2) and said tail (3) - is defined by
Figure imgb0017
Figure imgb0018
 or
Figure imgb0019
 µ = artg
Figure imgb0020
 v = radial ejection speed m / sec V = tangential speed V R = resulting speed N in rpm B = extreme radius of the barrel = r 2 C = ½ caliber or radius of the caliber 4.- Projectile selon la revendication 1, caractérisé en ce que ledit corps (2) est pourvu d'un traitement de surface protecteur, par exemple au cuivre.4.- Projectile according to claim 1, characterized in that said body (2) is provided with a protective surface treatment, for example with copper.
EP81201299A 1980-12-04 1981-11-24 Projectile for a centrifugal sling weapon Expired EP0053421B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81201299T ATE9182T1 (en) 1980-12-04 1981-11-24 PROJECTILE FOR A CENTRIFUGAL SLING WEAPON.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2058886 1980-12-04
BE2058886 1980-12-04

Publications (2)

Publication Number Publication Date
EP0053421A1 true EP0053421A1 (en) 1982-06-09
EP0053421B1 EP0053421B1 (en) 1984-08-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP81201299A Expired EP0053421B1 (en) 1980-12-04 1981-11-24 Projectile for a centrifugal sling weapon

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US (1) US4445436A (en)
EP (1) EP0053421B1 (en)
AT (1) ATE9182T1 (en)
BE (1) BE886481A (en)
DE (1) DE3165796D1 (en)
IL (1) IL64461A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE886481A (en) * 1980-12-04 1981-06-04 Rutten Leon PROJECTILE FOR CENTRIFUGAL LAUNCHER.
AU8751191A (en) * 1990-08-23 1992-03-17 International Shooter Development Fund, Inc. Match-grade rifle cartridge with improved components

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR796149A (en) * 1934-11-02 1936-03-30 Improvements to centrifugal rifles
US2043117A (en) * 1934-11-02 1936-06-02 Baden-Powell Baden Fletc Smyth Centrifugal gun
BE886481A (en) * 1980-12-04 1981-06-04 Rutten Leon PROJECTILE FOR CENTRIFUGAL LAUNCHER.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US179054A (en) * 1876-06-20 Improvement in projectiles
FR503198A (en) * 1917-02-06 1920-06-04 Eugene Andre Francois Naud Homogeneous metal perforating bullet
US2868130A (en) * 1953-06-17 1959-01-13 Olin Mathieson Ammunition
NL175341C (en) * 1970-10-28 1984-10-16 Eurometaal Nv METHOD FOR COMPOSITION OF A FIRE-SHOT BALL WITH A CORE OF HARD MATERIAL AND BALL MADE USING THAT METHOD

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR796149A (en) * 1934-11-02 1936-03-30 Improvements to centrifugal rifles
US2043117A (en) * 1934-11-02 1936-06-02 Baden-Powell Baden Fletc Smyth Centrifugal gun
BE886481A (en) * 1980-12-04 1981-06-04 Rutten Leon PROJECTILE FOR CENTRIFUGAL LAUNCHER.

Also Published As

Publication number Publication date
ATE9182T1 (en) 1984-09-15
US4445436A (en) 1984-05-01
BE886481A (en) 1981-06-04
EP0053421B1 (en) 1984-08-29
IL64461A (en) 1987-01-30
DE3165796D1 (en) 1984-10-04

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