EP3707461B1 - Projectile pour armes à feu - Google Patents

Projectile pour armes à feu Download PDF

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Publication number
EP3707461B1
EP3707461B1 EP18803380.7A EP18803380A EP3707461B1 EP 3707461 B1 EP3707461 B1 EP 3707461B1 EP 18803380 A EP18803380 A EP 18803380A EP 3707461 B1 EP3707461 B1 EP 3707461B1
Authority
EP
European Patent Office
Prior art keywords
projectile
base
tip
mandrel
projectile base
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.)
Active
Application number
EP18803380.7A
Other languages
German (de)
English (en)
Other versions
EP3707461A1 (fr
Inventor
Eric FIMBINGER
Johann Fimbinger
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Individual
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Individual
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Publication of EP3707461A1 publication Critical patent/EP3707461A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
    • F42B5/02—Cartridges, i.e. cases with charge and missile
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B10/00—Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missiles; Arrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding
    • F42B10/32—Range-reducing or range-increasing arrangements; Fall-retarding means
    • F42B10/38—Range-increasing arrangements
    • F42B10/42—Streamlined projectiles
    • F42B10/44—Boat-tails specially adapted for drag reduction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B10/00—Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missiles; Arrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding
    • F42B10/32—Range-reducing or range-increasing arrangements; Fall-retarding means
    • F42B10/38—Range-increasing arrangements
    • F42B10/42—Streamlined projectiles
    • F42B10/46—Streamlined nose cones; Windshields; Radomes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B30/00—Projectiles or missiles, not otherwise provided for, characterised by the ammunition class or type, e.g. by the launching apparatus or weapon used
    • F42B30/02—Bullets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
    • F42B5/02—Cartridges, i.e. cases with charge and missile
    • F42B5/025—Cartridges, i.e. cases with charge and missile characterised by the dimension of the case or the missile

Definitions

  • the invention relates to a projectile for firearms according to the preamble of patent claim 1.
  • the present case is a projectile in the form of a slender body of revolution, which is particularly suitable as a projectile for supersonic speeds M>1 and thus also satisfies the requirements of military use.
  • FR496520 discloses a projectile having a spike located centrally in the base of the bullet.
  • the present invention is based on the object of a projectile of the type described above with regard to targeting accuracy at supersonic speeds for distances up to 1300 m and above to improve.
  • a slim projectile for supersonic speed is to be created in which the circumferential flow is maintained uniformly over the entire trajectory from a front shock wave via a boundary layer enveloping the projectile body to a rear tail vortex ( 7 ), whereby the bullet shape with optimization is essentially designed according to the lowest flow resistance course over the length of the trajectory.
  • the final shape of the projectile according to the invention was determined in a first step as a simulation hypothesis using mathematical approximation methods and, after such simulation-based optimization, was subjected to the first practical tests.
  • a specific goal was initially to achieve hit accuracies that were usually achievable up to now for ranges of less than 800 m for even much larger ranges. It turned out that with supersonic speed up to a range of 1.5 km, a surprisingly high accuracy could be achieved, which suggests improved stability behavior along the entire projectile path with better propellant efficiency.
  • a design of the projectile tip is provided according to the invention in a manner known per se, which essentially describes a three-dimensional ogive shape.
  • the projectile tip is designed as a body of revolution in the form of an approximately circular arc-shaped ogive or similar to an elliptical ogive. This can also be designed essentially as a partially elliptical ogive.
  • the design of the rear section is of particular importance, which according to the invention has an inwardly recessed, rotationally symmetrical projectile base which has a spike in its center which extends at least to the rear edge of the projectile base.
  • the spike tip preferably ends approximately at the level of the rear edge of the projectile base or protrudes slightly beyond this.
  • This tail section ensures a tail vortex that stabilizes the trajectory and gently introduces the flow running off the base of the projectile into the circumferential flow.
  • the generating meridian of the indentation of the base of the bullet also has an influence on the stability of the bullet's trajectory.
  • the meridian of the floor between the tip of the spike and the trailing edge of the base describes a flat curve, the radius of curvature of which decreases near the spike on the one hand and the trailing edge on the other.
  • Both ends i.e. the tip and tail of such a long projectile, each considered individually but also independently of one another, influence the suitability of the projectile according to the invention in the context of solving the underlying problem, i.e. both the design of the projectile tip and the design of the projectile base alone and together determine the result the optimization according to the teaching of the proposed according to claim 1 design of the projectile shape.
  • the figures of the drawing show a projectile for firearms, shown to scale, namely in different enlargements of the caliber .338 (8.6 mm), also known under the designation Lapua Magnum. It is suitable for various uses, including military use, since its accuracy can also be used for this.
  • a cartridge 1 with projectile 2 and associated chamber 3 is shown in longitudinal section.
  • a cylindrical central part 6 of the projectile 2 is fastened in a narrowed neck part 4 of a cartridge case 5, ie the projectile 2 sits ready to be fired with a central alignment inside the cartridge chamber 3 in which the cartridge case 5 is accommodated and held axially.
  • At the neck part 4 of the cartridge case 5 there is a cone section 7 and then a cylinder section 8 of the cartridge case 5 for receiving the propellant charge.
  • the primer on the closed rear end of the cartridge case 5 and the associated firing mechanism as well as other parts of the firearm are in figure 1 not shown.
  • the projectile 2 shown in longitudinal section has a projectile tip 9 rounded at the front end, a cylindrical central part 6 and a tail 10 tapering conically towards the end, which ends with a projectile base 12 recessed around a central mandrel 11 .
  • figure 2 shows an enlarged side view of the projectile 2 within its cylindrical central part 6 between its upper limit 20 and its lower limit 21 a total of five guide bands 22 to 26 are provided, which are delimited from one another with four annular grooves 27 and together, as is known, the rectilinear bullet guidance in the barrel of the firearm to serve. Otherwise, as in all figures of the drawing, the same reference numerals are used for the same components, so that repeated information and explanations are unnecessary.
  • the deepening of the projectile base 12 is shown in a schematic projectile representation according to FIG figure 3 drawn with peripheral edge 13 of the trailing edge 14 of the floor 12.
  • the detail IV of 3 is a further enlargement of the indentation of the floor 12 in figure 4 shown.
  • the meridian 15 that determines the shape of the rotationally symmetrical indentation around the mandrel 11 of the projectile base 12 describes a flat curve whose radius of curvature decreases at both ends, on the one hand toward the mandrel 11 and on the other toward the trailing edge 14 .
  • the tip 11' of the mandrel 11 ends approximately at the level of the rear edge 14 of the projectile base 12.
  • the projectile tip 9 has an ogive shape, which adjoins the cylindrical central part 6 of the projectile 2 as a body of revolution.
  • the contour of the body of revolution describes an essentially elliptical ogive, the middle section of which is preferably designed as a partial section of an ellipse.
  • the drawn ogive shape approximates the so-called Newton tip, which is known per se as a bullet shape, the qualitative curve of which is indicated by a dash-dot line 17 in figure 5 is drawn.
  • the bullet tip 18 is rounded, the radius of the tip rounding being 4 to 8% of the caliber.
  • the total tip length is about 2.0 to 3.0 times the caliber or about 40 to 60% of the bullet length.
  • the length of the tapered tail is about 75 to 95% of the caliber.
  • the overall length of the projectile 2 is about 4.5 to 5.5 times and the length of the cylindrical center part 6 is about 1.5 to 2.0 times the caliber.
  • the tail cone angle K is about 7 degrees with respect to the central axis of projectile 2 (see 4 ).
  • the Figures 5 and 6 differ in terms of the formation of the floor 12 from the rest of the same Figures 3 and 4 .
  • the tip 11" of the spike 11 extends beyond the trailing edge 14 of the base 12, and this can be achieved by varying the length of the spike or the depth of the indentation of the base 12.
  • figure 7 shows the flow around the projectile 2 moving at about Mach 2, which is shown in a longitudinal section through its center plane with flow lines corresponding to an oncoming flow against the tip 9 towards the tail 10 .
  • the flow lines run similar to the drop model known from fluid mechanics and in the area adjoining the tail 10 of the projectile 2 form a stable tail vortex 31 favored by the deepened shape of the projectile base 12, which forms a gentle transition into the outflow at the rear of the projectile 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Toys (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Claims (3)

  1. Projectile (2) pour arme à feu, lequel comporte comme corps de rotation mince pour vitesse ultrasonique une partie centrale à peu près cylindrique (6) pour l'entourage de celle-ci par le collet (4) d'une douille de cartouche (1) et laquelle possède à l'extrémité avant une pointe (9), qui décrit pour l'essentiel une forme ogivale tridimensionnelle et à l'extrémité arrière un arrière (10) se réduisant coniquement avec un culot de projectile (12) approfondi symétriquement en rotation vers l'intérieur,
    caractérisé en ce qu'
    au centre dans le culot de projectile (12) est disposé un talon (11) dont la pointe (11', 11'') s'étend au moins jusqu'à l'arête arrière (14) du culot de projectile (12).
  2. Projectile selon la revendication 1,
    caractérisé en ce que
    le méridien se produisant (15) de la cavité du culot de projectile (12) décrit une courbe plate entre la pointe (11', 11'') de l'talon (11) et l'arête arrière (14) du culot de projectile (12), dont le rayon de courbure diminue près du talon (11) d'une part et de l'arête arrière (14) d'autre part de telle manière que le culot de projectile (12) forme un tourbillon arrière stabilisant la trajectoire, lequel introduit légèrement dans l'écoulement périphérique du projectile (2) l'écoulement s'échappant du culot de projectile (12).
  3. Projectile selon la revendication 1,
    caractérisé en ce que
    la profondeur maximale du culot de projectile (12) en dehors du talon (11) représente entre 5 % et 15 % du calibre.
EP18803380.7A 2017-11-10 2018-11-09 Projectile pour armes à feu Active EP3707461B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017126442.6A DE102017126442A1 (de) 2017-11-10 2017-11-10 Geschoss für Schusswaffen
PCT/EP2018/080768 WO2019092182A1 (fr) 2017-11-10 2018-11-09 Projectile pour armes à feu

Publications (2)

Publication Number Publication Date
EP3707461A1 EP3707461A1 (fr) 2020-09-16
EP3707461B1 true EP3707461B1 (fr) 2022-04-13

Family

ID=64308739

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18803380.7A Active EP3707461B1 (fr) 2017-11-10 2018-11-09 Projectile pour armes à feu

Country Status (6)

Country Link
US (1) US11118879B2 (fr)
EP (1) EP3707461B1 (fr)
AU (1) AU2018365320B2 (fr)
DE (1) DE102017126442A1 (fr)
RU (1) RU2020115532A (fr)
WO (1) WO2019092182A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019116283A1 (de) * 2019-06-14 2020-12-17 Ruag Ammotec Gmbh Projektil, Verfahren zum Herstellen eines Projektils und Munition
DE102019126585A1 (de) * 2019-10-02 2021-04-08 Rwm Schweiz Ag Geschoss mit verkürzter Reichweite

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES476388A1 (es) * 1978-12-27 1979-04-16 Lasheras Barrios Fernando Mejoras introducidas en la fabricacion de proyectiles.
US4517897A (en) * 1982-10-18 1985-05-21 Schweizerische Eidgenossenschaft, Vertreten durch die Eidg. Munitionsfabrik Thun der Gruppe fur Rustungsdienste Small arms projectile
GB2370873B (en) * 2001-01-09 2004-11-17 Eley Ltd Ammunition cartridge
US9052174B2 (en) * 2007-08-31 2015-06-09 Ra Brands, L.L.C. Tipped projectiles
US9739296B2 (en) * 2008-09-25 2017-08-22 Parafluidics Llc Channeling fluidic waveguide surfaces and tubes
USD632357S1 (en) * 2009-11-16 2011-02-08 Gusty Winds Corporation Bullet
FR3005726B1 (fr) * 2013-05-15 2018-03-02 Etat Francais Represente Par Le Delegue General Pour L'armement Cartouche en forme de bouteille
US8893621B1 (en) * 2013-12-07 2014-11-25 Rolando Escobar Projectile
CH709564A2 (de) * 2014-04-25 2015-10-30 Alpha Velorum Ag I G Aerodynamisch verbesserte Geometrie der Nase von Überschallflugkörpern.
DK3137843T3 (da) * 2014-04-30 2019-08-26 G9 Holdings Llc Projektil med forbedret ballistik
US9719762B2 (en) * 2015-04-01 2017-08-01 Keith A. Langenbeck Cartridges and bullets
US9857155B2 (en) * 2015-09-28 2018-01-02 James Allen Boatright Rifle bullet
US10222188B2 (en) * 2016-01-15 2019-03-05 Joshua M. Kunz Projectile with enhanced ballistic efficiency
HUE060908T2 (hu) * 2016-09-02 2023-04-28 Saltech Ag Penetrátoros lövedék

Also Published As

Publication number Publication date
AU2018365320B2 (en) 2023-03-30
RU2020115532A (ru) 2021-12-10
WO2019092182A1 (fr) 2019-05-16
RU2020115532A3 (fr) 2022-01-18
US20200408493A1 (en) 2020-12-31
US11118879B2 (en) 2021-09-14
AU2018365320A1 (en) 2020-05-28
DE102017126442A1 (de) 2019-05-16
EP3707461A1 (fr) 2020-09-16

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