The ordinary rudder is most efficient when at a 35° angle to the keel, after which its efficiency decreases until it becomes a brake at 90°.
Iplanga lokuqhuba eliqhelekileyo lifaneleke kakhulu kwi-engile engu 35° ukuya kwisiseko senqanawa, emva koko oko kufanela kuyehla de libe ngu 90°.