Section 1 General
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Special Service Craft, July 2022 - Part 3 General Requirements and Constructional Arrangements - Chapter 3 Control Systems - Section 1 General

Section 1 General

Parent topic: Chapter 3 Control Systems

1.1 Application

1.1.1 This Chapter applies to all the craft types detailed in the Rules, and requirements are given for rudders, nozzles, steering gear, bow and stern thrust unit structure and stabiliser structure.

1.2 General

1.2.1 The following symbols and definitions are applicable to this Chapter, unless otherwise stated:

σo = minimum yield stress or 0,5 per cent proof stress of the material, in N/mm2 and is not to be taken greater than 0,7σT
where
σT = ultimate tensile strength of the material, in N/mm2

1.2.2 The scantlings in aluminium alloy are to be obtained by multiplying the scantlings in mild steel, determined from this Chapter, by the following factors:

  1. Plating thickness factor = k ta

    where
    k ta =

  2. Section modulus and cross sectional area factor, k aa

    where
    k aa = 235/σya or 1,36, whichever is the greater
    σya = specified minimum yield stress or 0,2 per cent proof stress of aluminium alloy in the welded condition, in N/mm2

1.3 Navigation in ice

1.3.1 Where an ice class notation is to be included in the class of a craft, the scantlings will require special consideration, see Pt 3, Ch 2, 9 Navigation in ice.

1.4 Materials

1.4.1 The requirements for materials are contained in the Rules for the Manufacture, Testing and Certification of Materials (hereinafter referred to as the Rules for Materials.

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