WE KNOW THAT RUDDER IS MADE TO TURN FROM 35 TO 35. BUT THE QUESTION NOW ARISES IS THAT WHY THE ANGLE IS LIMITED TO ONLY 35 DEGREE AND NOT MORE THAN THAT. WHY NOT 40 OR 45.
THE ANSWER IS REDUCTION IN EFFICIENCY OF THE RUDDER DUE TO FORMATION OF EDDIES ON TH BACK OF THE RUDDER AS THE FLOW IS NOT STREAMLINE AND WILL CAUSE A DRAG. THIS IS ALSO CALLED STALLING OF RUDDER.