the front and back sides of the two positioning members 9a and 9b branch lines to intermediate electrodes may likewise be provided if a voltage is applied between the electrodes 14 on the front and back side of the upper piezoelectric positioning member 9a via the control circuit 15 in the rest position of the missile tip shown in fig1 this piezoelectric positioning member expands in the longitudinal direction of the column thereby the shell tip 4 is rotated in the direction of the arrow a the longitudinal expansion of the piezoelectric positioning member depends on the applied voltage the positioning force is very large here so that the opposite piezoelectric positioning member 9b is compressed separate actuation of this second piezoelectric positioning member 9b is not necessary as a rule however it is also possible to subject this second piezoelectric positioning member to a voltage of opposite polarity so that it contracts and does not interfere with the tilting of the shell tip 4 in the direction of the arrow a in order to obtain different longitudinal expansions either the voltage between the electrodes 14 can be changed or the voltage is applied between tee electrode facing the back wall 12 and an intermediate electrode via a branch line 17 the shell tip 4.