WO2008071608A1 - Dispositif d'empennage porteur deployable pour obus - Google Patents
Dispositif d'empennage porteur deployable pour obus Download PDFInfo
- Publication number
- WO2008071608A1 WO2008071608A1 PCT/EP2007/063372 EP2007063372W WO2008071608A1 WO 2008071608 A1 WO2008071608 A1 WO 2008071608A1 EP 2007063372 W EP2007063372 W EP 2007063372W WO 2008071608 A1 WO2008071608 A1 WO 2008071608A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- leaves
- fins
- shell
- leaf
- ammunition
- Prior art date
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
- F42B10/14—Stabilising arrangements using fins spread or deployed after launch, e.g. after leaving the barrel
- F42B10/16—Wrap-around fins
Definitions
- the present invention relates to an expandable carrier stabilizer device for artillery ammunition.
- most empennages are not carriers but stabilizers.
- Most current solutions are like folding wings in the form of shells conforming to the outer cylindrical shape of the shell. The size of these known devices is reduced, but this form of fins is not at all planing and moreover their deployment is limited by the caliber of the ammunition.
- the present invention relates to an expandable carrier tail device for artillery ammunition to increase the length of the hovering flight of the ammunition on its path.
- the empennage device is characterized in that it comprises a stabilizer with one or more pairs of fins (necessary condition to have a good planing wing), each fin having at least two plane leaves, folded at start of the blow and protected by a base, these fins unfolding in flight, after ejection of the base, by the effect of the gyration of the ammunition, their leaves then coplanar.
- a stabilizer with one or more pairs of fins (necessary condition to have a good planing wing), each fin having at least two plane leaves, folded at start of the blow and protected by a base, these fins unfolding in flight, after ejection of the base, by the effect of the gyration of the ammunition, their leaves then coplanar.
- FIG. 1 is a perspective view of a base of shells with a snatch showing part of the folded tail of the invention
- - Figure 2 is a perspective view of the folded tail of Figure 1, the base being removed
- Figures 3 and 4 are further perspective views showing the folded fins of different embodiments at different angles
- FIG. 5 is a perspective view of an embodiment of an unfolded fin of the device of the invention
- Figure 6 is a perspective view of the fin of Figure 5 deployed and fixed on the shell.
- the present invention is described below with reference to a shell equipped with a tail with four folding wings each having two planar leaves, but it is understood that it can be applied to other types of artillery ammunition and that it is not limited to the embodiment with four folding wings each having two leaf leaves, and may have a different number of fins, and that its fins may have more than two leaves planes.
- the body of the shell 1, of which only the posterior end 2 has been shown in the drawing, is extended by a beam 3 which supports the base 10.
- the beam 3 is connected to the end 2 of the body of the shell. shell by a substantially planar crown-shaped wall 4, this central beam supports the flange 3 a.
- a stabilizer 5 with four identical deployable fins 6 to 9 is fixed on the wall 4 and the flange 3A, and is capped, before the launch of the shell, with a cylindrical base 10 whose external diameter is substantially equal to that of the body 2.
- the fins 6 to 9 each consist of two leaf leaves having a general shape of rectangular parallelepipeds of small thickness (a few millimeters), respectively referenced 6 A and 6B to 9A and 9B. We will call later "plan" of these leaves the plane parallel to their large faces and passing through their center.
- the leaves 6A to 9A are articulated by one of their short sides on axes of rotation 6C to 9C respectively, these axes being fixed by one of their ends on the wall 4 and the flange 3A, parallel to the longitudinal axis of the shell, by being regularly spaced (arranged at 90 ° to each other) on a common circle which is centered on the longitudinal axis of the shell and located between the central beam and the internal diameter the base of the shell.
- a plate 3A is fixed at the other end of the axes 6C to 9C, perpendicularly to the longitudinal axis of the beam 3.
- the length of the leaves 6A to 9A, measured perpendicularly to their corresponding axis of rotation, is greater than the distance separating two successive axes of rotation.
- the rotation of the leaves 6A to 9A around their respective axes of rotation is limited, by means not shown in the drawing, at about 270 °.
- the first extreme position in rotation that these leaves can occupy, and here called “rest position" of the fins 6 to 9 is a position for which each of them is in contact with the end hinged next leaf (considered in the sense of clockwise in this case, the shell being seen from the rear), the first extreme position being that for which we can cap the fins 6 to 9 with their hood protection, which prevents any movement of the leaves when in place.
- the empennage 5 thus folded in the rest position forms a polyhedron whose contour, considered in a plane perpendicular to the longitudinal axis of the shell, is approximately square.
- each of the four fins has more than two leaves, their length and the way they are folded are such that said contour remains a square.
- the said contour of the polygon comprises a corresponding number of sides.
- the leaves 6B to 9B are hinged to the respective ends of the carrier leaves 6A to 9A opposite to those which are articulated on the axes 6C to 9C.
- the rotation of the end leaves, once the fins 6 to 9 are mounted on the axes of rotation 6C to 9C, is limited to about 90 °.
- each of the leaves other than the door leaf comprises such stops which rest on the corresponding leaf (previous leaf).
- the joints of the end leaves and the carrier leaves each comprise a non-return device 6 E, not shown on the carrier leaves blocking each of the leaves in the deployed position.
- the shell 1 is launched with the cap 10 covering the fins 5 folded, as shown in Figure 1.
- the launching of the shell is done so as to print a rotational movement about its longitudinal axis (rolling motion).
- the cap 10 which hoods the fins is ejected, which causes the deployment of the fins under the simple effect of the gyration of the shell and taking wind leaves.
- the direction of folding fins is, of course, such that the gyration of the shell forces them to unfold: thus, for the example shown in the drawing, the rotation of the shell, as seen from the back , is done in the direction of clockwise.
- the solution of the invention allows the opening of true aerodynamically carrier fins of straight shapes necessary for an optimal gliding flight of the ammunition.
- These fins fold into the base of the ammunition in two or more leaves, while having a minimum footprint compatible with the diameter of the ammunition, the base being ejectable during the flight. They unfold under the effect of gyration of the munition.
- the fin deployment is stopped by stops located on the axis of the foot of the fins with the possibility of an anti-return.
- the invention thus makes it possible to have a large deployment of the fins.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Toys (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2007332583A AU2007332583B2 (en) | 2006-12-15 | 2007-12-05 | Extendable lifting tail device for shell |
EP07857261A EP2089666A1 (fr) | 2006-12-15 | 2007-12-05 | Dispositif d'empennage porteur deployable pour obus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0610952A FR2910122B1 (fr) | 2006-12-15 | 2006-12-15 | Dispositif d'empennage porteur deployable pour obus |
FR0610952 | 2006-12-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008071608A1 true WO2008071608A1 (fr) | 2008-06-19 |
Family
ID=38277601
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2007/063372 WO2008071608A1 (fr) | 2006-12-15 | 2007-12-05 | Dispositif d'empennage porteur deployable pour obus |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2089666A1 (fr) |
AU (1) | AU2007332583B2 (fr) |
FR (1) | FR2910122B1 (fr) |
WO (1) | WO2008071608A1 (fr) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2924175A (en) * | 1955-10-20 | 1960-02-09 | Brandt Soc Nouv Ets | Foldable fin arrangement for a projectile |
DE2649643A1 (de) * | 1976-10-29 | 1978-06-15 | Messerschmitt Boelkow Blohm | Raketengetriebener flugkoerper mit entfaltbaren stabilisierungsflaechen |
EP0236552A1 (fr) * | 1985-12-18 | 1987-09-16 | The State Of Israel, Ministry Of Defence, Israel Military Industries | Obus à munitions en grappe avec moyen de diminution de la rotation |
WO2003001141A1 (fr) * | 2001-06-23 | 2003-01-03 | Diehl Munitionssysteme Gmbh & Co. Kg | Projectile d'artillerie a charge utile interchangeable |
US6834828B1 (en) * | 2003-09-23 | 2004-12-28 | The United States Of America As Represented By The Secretary Of The Navy | Fin deployment system |
DE102005035829A1 (de) * | 2005-07-30 | 2007-02-01 | Diehl Bgt Defence Gmbh & Co. Kg | Rollentkoppeltes Leitwerk für ein Artilleriegeschoss |
-
2006
- 2006-12-15 FR FR0610952A patent/FR2910122B1/fr not_active Expired - Fee Related
-
2007
- 2007-12-05 EP EP07857261A patent/EP2089666A1/fr not_active Withdrawn
- 2007-12-05 AU AU2007332583A patent/AU2007332583B2/en not_active Ceased
- 2007-12-05 WO PCT/EP2007/063372 patent/WO2008071608A1/fr active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2924175A (en) * | 1955-10-20 | 1960-02-09 | Brandt Soc Nouv Ets | Foldable fin arrangement for a projectile |
DE2649643A1 (de) * | 1976-10-29 | 1978-06-15 | Messerschmitt Boelkow Blohm | Raketengetriebener flugkoerper mit entfaltbaren stabilisierungsflaechen |
EP0236552A1 (fr) * | 1985-12-18 | 1987-09-16 | The State Of Israel, Ministry Of Defence, Israel Military Industries | Obus à munitions en grappe avec moyen de diminution de la rotation |
WO2003001141A1 (fr) * | 2001-06-23 | 2003-01-03 | Diehl Munitionssysteme Gmbh & Co. Kg | Projectile d'artillerie a charge utile interchangeable |
US6834828B1 (en) * | 2003-09-23 | 2004-12-28 | The United States Of America As Represented By The Secretary Of The Navy | Fin deployment system |
DE102005035829A1 (de) * | 2005-07-30 | 2007-02-01 | Diehl Bgt Defence Gmbh & Co. Kg | Rollentkoppeltes Leitwerk für ein Artilleriegeschoss |
Also Published As
Publication number | Publication date |
---|---|
FR2910122A1 (fr) | 2008-06-20 |
FR2910122B1 (fr) | 2009-03-06 |
EP2089666A1 (fr) | 2009-08-19 |
AU2007332583A1 (en) | 2008-06-19 |
AU2007332583B2 (en) | 2013-09-19 |
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