illing ▁rud der . ▁However , ▁the ▁basic ▁shape ▁is ▁a ▁relatively ▁simple ▁‘ fish ▁shape ’ ▁if ▁viewed ▁from ▁above ▁( as ▁seen ▁in ▁the ▁figure ▁to ▁the ▁right ). ▁Also , ▁pair ▁of ▁flat ▁pl ates ▁are ▁typically ▁fitted ▁top ▁and ▁bottom ▁to ▁prevent ▁or ▁minim ize ▁end - effect ▁on ▁the ▁aer of o il . ▁ ▁The ▁basic ▁principal ▁proport ions ▁of ▁a ▁typical ▁Sch illing ▁rud der ▁layout ▁are ▁as ▁follows : ▁ ▁R ounded ▁leading ▁edge ▁ ▁Max imum ▁width ▁of ▁aer of o il ▁at ▁ 2 0 % ▁ch ord . ▁ ▁T aper ▁to ▁ 6 0 % ▁ch ord . ▁ ▁Fl at ▁to ▁ 8 0 % ▁ch ord ▁ ▁F lare ▁to ▁ 1 0 0 % ▁ ▁Or ▁in ▁other ▁words , ▁a ▁bul b ous ▁w iden ing ▁for ▁ 1 / 5 ▁of ▁the ▁total ▁length ▁of ▁the ▁rud der ▁bla de , ▁with ▁a ▁stream lined ▁narrow ing ▁for ▁ 2 / 5 ▁of ▁the ▁length ▁leading ▁to ▁a ▁flat ▁section ▁last ing ▁for ▁around ▁ 1 / 5 ▁of ▁a ▁cord - length , ▁final izing ▁in ▁a ▁bl unt - ended ▁fla red ▁trailing ▁edge ▁for ▁the ▁remaining ▁fifth . ▁ ▁The ▁width ▁of ▁the ▁trailing ▁edge ▁should ▁be ▁ 3 3 % ▁of ▁the ▁maximum ▁width ▁of ▁the ▁profiles . ▁The ▁width ▁of ▁the ▁end ▁pl ates ▁to ▁be ▁around ▁twice ▁the ▁maximum ▁width ▁of ▁the ▁rud der . ▁ ▁The ▁height ▁should ▁be