Fin-stabilized projectile

A fin-stabilized projectile comprising

• (a) a projectile body having a longitudinal projectile axis;
• (b) a rear portion including a rearwardly open cavity;
• and
• (c) a stabilizing assembly including
• (1) a fin support accommodated in said cavity and being axially slidable relative thereto;
• said fin support having a retracted position in which said fin support is substantially withdrawn into said cavity and an axially outwardly shifted position in which said fin support projects rearward and outwardly from said projectile body;
• (2) a plurality of fins held in said fin support for pivotal motion about an axis transverse to the longitudinal projectile axis;
• each fin having a folded state in which it is withdrawn in said fin support when said fin support is in said retracted position and a deployed state in which it is in an unfolded state and extends substantially externally of said fin support when said fin support is in said outwardly shifted position;
• (3) first means for axially displacing said fin support when the projectile has left a weapon barrel after firing;
• said first means including
• (i) a frontal end wall forming part of said fin support;
• (ii) a chamber forming part of said cavity and defined between a rearward end of said projectile body and said frontal end wall of said fin support when said fin support is in said retracted position;
• and
• (iii) a through aperture provided in said frontal end wall of said fin support for maintaining communication between said chamber and an environment outside said chamber, whereby gas pressure in said chamber shifts said fin support into said outwardly shifted position in response to a difference in pressures prevailing in said chamber and in the environment outside said chamber;
• and
• (4) second means for moving said fins into said deployed state when said fin support assumes said outwardly shifted position.