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1. WO1981002926 - A BALLISTIC ARTILLERY PROJECTILE,THAT IS INITIALLY SPIN-STABILIZED

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[ EN ]

Claims :

1. A ballistic artillery projectile (2) that is initially spin-stabilized and provided with extendable fins (1), designed to be extended after the projectile (2) has
covered a part of the trajectory, characterized in that the fins (1) are attached to the projectile (2) by means of torsion bars (3).

2. An artillery projectile according to claim 1 characterized in that the torsion bars (3) are designed with engagement parts (4), of which in mounted condition, at least one per bar is in fixed engagement with a fin (1) and at least one per bar is in fixed engagement with the projectile (2) so that rotation of the bars in relation to the fins (1) and the projectile (2) is made impossible and with torsion parts (5), that are located between
engagement parts (4) attached to the fins (1) and engagement parts (4) attached to the projectile (2) and that are designed to be deformed by torsion when the fins (1) are being extended.

3. An artillery projectile according to claim 2, characterized in that the engagement parts (4) of the bar (3) has a multilateral cross section.

4. An artillery projectile according to claim 2, characterized in that the engagement parts (4) of the bar (3) are provided with splines.

5. An artillery projectile according to one of the claims 2-4, characterized in that the torsion parts (5) of the bar (3) by means of working has been given a determined cross section and a determined length.

6. An arτillery projectile according to one of the previous claims characterized in that the fins (1) are of the wraparound type.

7. An artillery projectile according to one of the claims 1-5, characterized in that the fins (1) in retracted position are lying in a radial slot in the projectile (2) and are designed to be extended by rotation round a bar that lies as a chord in the cross section of the projectile (2).