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Machine translation
1. (WO1981002926) A BALLISTIC ARTILLERY PROJECTILE,THAT IS INITIALLY SPIN-STABILIZED
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/002926    International Application No.:    PCT/SE1981/000100
Publication Date: 15.10.1981 International Filing Date: 30.03.1981
IPC:
F42B 10/16 (2006.01)
Applicants:
Inventors:
Priority Data:
8002453 31.03.1980 SE
Title (EN) A BALLISTIC ARTILLERY PROJECTILE,THAT IS INITIALLY SPIN-STABILIZED
(FR) PROJECTILE D"ARTILLERIE BALISTIQUE DONT LA ROTATION INITIALE EST STABILISEE
Abstract: front page image
(EN)In order to reduce the dispersion of artillery projectiles (2) it is previously known to correct their trajectory in the terminal phase. The projectiles are usually spin-stabilized or fin-stabilized during their entire trajectory. It has, however, been proposed to give the projectiles (2) a stabilizing rotation at the firing which after a part of the trajectory has been covered are being braked by fins (1) that are extended and thereafter stabilize the projectile (2). This simple principle is, however, very difficult to realize, because the dynamic forces on the fins (1), which are caused by the centrifugal forces from the rotation of the shell and which are the motive power at the extension, are very big during the course of extension and at the impact of the fins (1) against stop and locking device in the extended position. In the present invention the problem is solved by attaching the fins (1) to the projectile (2) by means of bars (3) designed to be able to be plasticly twisted, torsion bars.
(FR)De maniere a reduire la dispersion des projectiles d"artillerie (2), la technique de l"art anterieur permet de corriger leur trajectoire dans la phase terminale. Les projectiles sont generalement stabilises en rotation ou stabilises par des ailettes pendant toute leur trajectoire. Cependant il a ete propose de donner aux projectiles (2) une rotation de stabilisation au moment du tir et ceux-ci, apres avoir couvert une partie de leur trajectoire, sont freines par des ailettes (1) qui se deploient et stabilisent le projectile (2). Ce principe simple est cependant tres difficile a realiser parce que les forces dynamiques s"exercant sur les ailettes (1), qui sont dues aux forces centrifuges de la rotation de l"obus et qui sont les forces motrices de l"extension, sont tres importantes pendant l"extension et au moment de l"impact des ailettes (1) contre le dispositif de butee et de verrouillage dans la position deployee. Dans la presente invention, ce probleme est resolu en attachant les ailettes (1) au projectile (2) a l"aide de barres de torsion (3) concues pour pouvoir subir une torsion plastique.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)