insert these surfaces are positioned on either side of the thrust plate 7 the front 18 and rear 17 bearing surfaces ensure that the front and rear parts of the insert 11 to which the inertial loads of the penetrator are applied are driven by the sabot body 2 bearing surfaces 17 and 18 are plane and inclined with respect to the sabot axis 19 the insert 11 is of a length selected such that it only covers the most mechanically stressed front and rear parts it is thus pointless to prolong the insert to the front and rear ends of the sabot which are less mechanically stressed than the median parts of these front 9 and rear 8 parts thus as may be seen in fig2 b the rear length l r of the insert 11 between the rear bearing surface 17 and its rear end is between 50 and 70 of the length l 1 of all the rear part 8 of the sabot length between the rear bearing surface 17 and the rear end of the sabot similarly the front length l f of the insert 11 between the bearing surface 18 and its front end is between 40 and 70 of the length l 2 of the front part 9 of the sabot length between the front bearing surface 18 and the front end of the sabot the sabot according to the invention thus has a mass of 20 to 30 less than homogenous sabots made of aluminum whilst having adequate mechanical strength this results in an increase in the velocity of the penetrator of around 5 to 8 thus an increase in its performances a second embodiment is shown in fig4 a.