She then maintains her fore- and-aft trim by adjusting the levels of water in her trim tanks, and by the use of torpedo operating tanks to compensate for the loss of weight when torpedoes are fired .
Emva koko ithi igcine isilungelelanisi sayo ngokuthi ilungelelanise imigangatho yesilungelelanisi kwitanki layo, kwaye nangokusebenzisa imbumbulu ende enkulu eyenza ukuba buphunguke ubunzima benkwili xa ithe yadutyulwa.