EP0249525B1 - Stabilisierungsflossen für einen in Pfeilform ausgebildeten Penetrator - Google Patents

Stabilisierungsflossen für einen in Pfeilform ausgebildeten Penetrator Download PDF

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Publication number
EP0249525B1
EP0249525B1 EP87401209A EP87401209A EP0249525B1 EP 0249525 B1 EP0249525 B1 EP 0249525B1 EP 87401209 A EP87401209 A EP 87401209A EP 87401209 A EP87401209 A EP 87401209A EP 0249525 B1 EP0249525 B1 EP 0249525B1
Authority
EP
European Patent Office
Prior art keywords
fin assembly
assembly according
type
weight
projectile
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.)
Expired - Lifetime
Application number
EP87401209A
Other languages
English (en)
French (fr)
Other versions
EP0249525A1 (de
Inventor
Jean-Claude Sauvestre
Francis Ledys
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.)
Giat Industries SA
Original Assignee
Direction General pour lArmement DGA
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 Direction General pour lArmement DGA filed Critical Direction General pour lArmement DGA
Priority to AT87401209T priority Critical patent/ATE56814T1/de
Publication of EP0249525A1 publication Critical patent/EP0249525A1/de
Application granted granted Critical
Publication of EP0249525B1 publication Critical patent/EP0249525B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • F42B10/02—Stabilising arrangements
    • F42B10/04—Stabilising arrangements using fixed fins
    • F42B10/06—Tail fins

Definitions

  • the present invention relates to a tail unit for kinetic energy projectile of the arrow type comprising an elongated rod made of heavy material.
  • the projectiles most often consist of bars of heavy material such as for example tungsten, provided with tail lights made of light alloy or even steel.
  • a first drawback presented by the light aluminum alloy empennages is their poor behavior during the exterior ballistics phase when the initial speed exceeds 1650 m / s and the distance traveled exceeds 2500 meters.
  • a second drawback, attached to the tail lights made both of light alloy and of steel, is the disturbance that the latter causes to the bar following the impact of the projectile on a multilayer armor plate. It has been observed that during such an impact, the transverse stresses to which the tail unit is subjected are transmitted to the bar and cause it to rupture, thereby reducing its effectiveness and the depth of penetration into the target.
  • patent DE 3 119646 proposes to reduce the dead weight of projectiles of all types (arrows, medium-caliber, feathered projectiles with hollow charge, missiles) by making certain peripheral parts of the latter in composite materials, but this teaching is not apply to the empennage of these.
  • the object of the invention is to propose a stabilizing stabilizer having the lowest possible mass and thus making it possible to ensure a large range for the projectile, while being able to resist erosion on the trajectory.
  • the tail proposed by the invention is very easy to build and low manufacturing cost.
  • the invention therefore relates to a tail unit for kinetic energy projectile of the arrow type comprising an elongated rod made of heavy material, characterized in that it is made of a material constituted by a plastic material comprising 0% to 60% by weight of reinforcement and / or load, and in that the material thus produced has a melting temperature greater than 520 ° K and a coefficient of thermal conductivity less than 0.25 WATT / (meter x oK).
  • the plastic material is of the plastimer type chosen from the group: polyamide 6, polycarbonate, high density polyethylene, polyarylamide, polyimide, polyethrimide, polyphenylsulfone, polyamide-imide.
  • the filler is chosen from the group: bronze powder, beryllium oxide, glass beads.
  • the reinforcement is chosen from the group: glass fibers, carbon fibers, "kevlar” fibers, or boron fibers.
  • Another advantage of this invention is that the reduction in the mass of the tail unit makes it possible to reduce the tensile forces in the bar and improves its mechanical strength.
  • a lighter plastic stabilizer makes it possible to transfer the mass difference to the useful part (bar) which contributes to improving the perforation performance.
  • a bar equipped with a plastic stabilizer of the polyamide 6 type reinforced with 30% by mass of glass fibers could be pulled at a distance of 3500 m; whereas a bar of the same mass always, but with an aluminum empennage, could not exceed 2500 m.
  • the poor performance linked to the aluminum tailplane is due to the erosion on its trajectory. It has been observed, for a plastic empennage loaded with glass fibers, that the plastic binder is eroded surface to reveal the glass fiber and that erosion is then stopped because the glass acts as a thermal screen. Similar results will be obtained with empennages made of materials having a melting temperature above 520 ° K as well as a low coefficient of thermal conductivity (less than 0.25 Watt / (meter. ° K). the surface heating of the empennage cannot cause its melting, so other fillers or reinforcements (such as carbon fiber or "Kevlar") allowing the coefficient of thermal conductivity to be lowered can be adopted. choose a plastic material of the thermosetting type, loaded or not.

Claims (6)

1. Leitwerk für pfeilartiges Wuchtgeschoß bestehend aus einem gestreckten Stab aus schwerem Werkstoff, dadurch gekennzeichnet, daß es aus einem Werkstoff bestehend aus einem Kunststoff gefertigt ist, der einen Anteil von 0% bis 60% an Verstärkungs- und/oder Füllmasse enthält, und daß der somit zusammengesetzte Kunststoff eine Schmelztemperatur über 250 K und eine Wärmeleitzahl geringer als 0,25 W/m Kaufweist.
2. Leitwerk nach Anspruch 1, dadurch gekennzeichnet, daß der Kunststoff aus einem Plastimer besteht, der in der Gruppe Polyamid 6, Polycarbonat, HD-Polyäthylen, Polyarylamid, Polyimid, Polyätherimid, Polyphenilsulfon, Polyamidimid gewählt wird.
3. Leitwerk nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß als Füllstoff Bronzepulver, Berylliumoxyd oder Glaskugeln verwendet wird.
4. Leitwerk nach einem beliebigen Anspruch 1 bis 3, dadurch gekennzeichnet, daß der Verstärkungsstoff in der Gruppe Glas-, Kohlenstoff-, Kevlar-oder Borfasern gewählt wird.
5. Leitwerk nach einem beliebigen Anspruch 1 bis 4, dadurch gekennzeichnet, daß es aus mit einem Gewichtsanteil von 30% Glasfasern verstärktem Polyamid 6 besteht.
6. Leitwerk nach einem beliebigen Anspruch 1 bis 4, dadurch gekennzeichnet, daß es aus mit einem Gewichtsanteil von 50% Glasfasern verstärktem Polyarylamid besteht.
EP87401209A 1986-06-05 1987-05-29 Stabilisierungsflossen für einen in Pfeilform ausgebildeten Penetrator Expired - Lifetime EP0249525B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87401209T ATE56814T1 (de) 1986-06-05 1987-05-29 Stabilisierungsflossen fuer einen in pfeilform ausgebildeten penetrator.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8608095 1986-06-05
FR8608095A FR2599829B1 (fr) 1986-06-05 1986-06-05 Empennage pour projectile a energie cinetique de type fleche

Publications (2)

Publication Number Publication Date
EP0249525A1 EP0249525A1 (de) 1987-12-16
EP0249525B1 true EP0249525B1 (de) 1990-09-19

Family

ID=9336021

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87401209A Expired - Lifetime EP0249525B1 (de) 1986-06-05 1987-05-29 Stabilisierungsflossen für einen in Pfeilform ausgebildeten Penetrator

Country Status (6)

Country Link
EP (1) EP0249525B1 (de)
AT (1) ATE56814T1 (de)
DE (1) DE3765017D1 (de)
ES (1) ES2018033B3 (de)
FR (1) FR2599829B1 (de)
IL (1) IL82750A (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8706250D0 (en) * 1987-03-17 1987-04-23 Secr Defence Tail fin unit for projectile
DE3927917A1 (de) * 1989-08-24 1991-02-28 Rheinmetall Gmbh Fluegelstabilisiertes geschoss
EP0484958A3 (en) * 1990-11-09 1992-10-28 Alliant Techsystems Inc. Protective coating for projectile fins
US5158509A (en) * 1990-12-14 1992-10-27 The United States Of America As Represented By The United States Department Of Energy Composite stabilizer unit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1288365A (fr) * 1961-04-07 1962-03-24 Oregon Etablissements Fuer Pat Nouveau projectile empenné
FR1307270A (fr) * 1961-06-08 1962-10-26 Le Ministre Des Armees Terre D Empennage pour projectile et son procédé d'assemblage
US4328750A (en) * 1978-10-26 1982-05-11 Bangor Punta Corporation Plastic coated ammunition and methods of manufacture
DE3119646A1 (de) * 1981-05-16 1982-12-02 Rheinmetall GmbH, 4000 Düsseldorf Geschoss

Also Published As

Publication number Publication date
FR2599829A1 (fr) 1987-12-11
ATE56814T1 (de) 1990-10-15
IL82750A (en) 1992-01-15
ES2018033B3 (es) 1991-03-16
IL82750A0 (en) 1987-12-20
FR2599829B1 (fr) 1990-04-13
DE3765017D1 (de) 1990-10-25
EP0249525A1 (de) 1987-12-16

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