Section 1 Scope
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Naval Ships, January 2023 - Volume 2 Machinery and Engineering Systems - Part 4 Propulsion Devices - Chapter 1 Propellers - Section 1 Scope

Section 1 Scope

Parent topic: Chapter 1 Propellers

1.1 Application

1.1.1 This Chapter defines the requirements for the design and service life of marine propellers for naval ships and is to be read in conjunction with the General Requirements for Machinery and Engineering Systems in Vol 2, Pt 1, Ch 1 General Requirements for Classification of Engineering Systems and Vol 2, Pt 1, Ch 3 Requirements for Design, Construction, Installation and Sea Trials of Engineering Systems

1.1.2 The scope of this Chapter includes propellers for main propulsion, the support arrangements and the controls and systems necessary to maintain operation and functionality of the propeller. The contents are in respect of mechanical integrity of the propeller, control and monitoring systems and other support critical systems.

1.1.3 Marine propellers utilised for propulsion purposes are within the Mobility category as defined in Vol 2, Pt 1, Ch 1, 3 Engineering system designation

1.1.4 With the exception of the requirements of Vol 2, Pt 4, Ch 1, 8 Propeller tolerances, this Chapter is applicable to fully immersed propellers that are non-ducted. The propellers may be non-cavitating, partially cavitating or supercavitating.

1.1.5 Propeller designs for applications other than those specified in Vol 2, Pt 4, Ch 1, 1.1 Application 1.1.4 will be specially considered.

1.1.6  See Vol 2, Pt 1, Ch 3, 12 Propellers for construction, installation and testing requirements.

1.2 Power ratings

1.2.1 In this Chapter where the dimensions of any particular components are determined from shaft power, P, in kW, and revolutions per minute, R, the values to be used are those defined in Vol 2, Pt 1, Ch 3, 4.3 Power ratings

1.3 Propeller skew angle definition

1.3.1 The maximum skew angle of a propeller blade is defined as the angle, in projected view of the blade, between a line drawn through the blade geometric tip and the shaft centreline and a second line through the shaft centreline which acts as a tangent to the locus of the mid-points of the helical blade sections, see Figure 1.1.1 Definition of skew angle.

Figure 1.1.1 Definition of skew angle
Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.