Abstract: The invention is a projectile stabilizing fin formed with a laterally exting flat, triangular shaped tab positioned so that one point of the triangle points in the direction of the intended projectile direction and tilted so that air flow will impinge on the tab surface and cause the projectile to spin. Such construction is particularly useful for projectiles launched from smooth bore guns at high Kinetic Energy.

Abstract: Stiffeners between sabot petals resist bending of a kinetic energy projece, and thereby reduce aiming dispersion. The stiffeners compensate for material removed during the separation of an annular sabot into individual sabot petals, thereby eliminating the need for post-assembly machining to restore a circular perimeter. The stiffeners may extend radially from the surface of the kinetic energy projectile to the gun bore, for direct force carry-through, to reduce flexure and whip. In one embodiment, a thick portion on each stiffener fits into a notch in the abutting sabot petals to strengthen the sabot in a manner similar to an "I" beam.