Home NI590 Rudders in composite materials This Guidance Note defines a methodology to assess scantling of rudders (rudder stock, rudder blade and flap, rudder trunk and rudder horn) built in composite materials and the requirements for the manufacture inspections and tests for rudders. Reference Title Edition NI590 R00 Rudders in composite materials Sep 2013 check relted documents: NR546 Hull in composite materials and plywood, material approval, design principles, construction and survey NR467 Rules for the classification of steel ships Check other Bureau Veritas rules and guidelines.