In ships with bluff or rounded sterns the wake effect is large and the speed of the water passing the rudder may be as much as 35 per cent less than that of the ship.
Kwiqanawa ene blafu okanyo ejekelezwe sisibonda senaanawa esiphambili uchaphazeleka yovuko enkulu nesantya samanzi adlula ngaphezu kwepesenti ezinga mashumi amathathu ngaphanthsi kancinci kweyenqanawa.