The prime functions of the rudder are therefore first to produce the moment to start the ship turning, and secondly to keep her turning (if desired) by resisting the tendency of the water pressure to push her back on to her original course.
Umsebenzi wokuqala wephini kukwenza imizuzu yokuqalisa ukujika, okwesibini ukungcina ukujika xa kuyimfuneko.