ISO INTERNATIONAL STANDARD 12215-8 First edition 2009-05-15 Small craft Hull construction and scantlings Part 8: Rudders Petits navires Construction de coques et échantillonnage- Partie 8: Gouvernails Reference number ISO 12215-8:2009(E) @ ISO 2009 IHSunder Not for Resale ISO12215-8:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In COPYRIGHTPROTECTEDDOCUMENT @ ISO2009 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either isO at the address below or IsO's memberbody in the country of the requester. ISO copyright office Case postale 56. CH-1211Geneva 20 Tel. + 4122 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO 2009 - All rights reserved ted without license from IHS Not for Resale ISO 12215-8:2009(E) Contents Page Foreword. Introduction vi 1 Scope 2 Normative references . 3 Terms and definitions.. 4 Symbols. 5 Design stresses ... 5.1 Rudder material.... 6 Rudder and steering arrangement, rudder types.. 6.1 General.... 6.2 7 Design rudder force calculation... 10 7.1 General.. 10 7.2 Force F, and corresponding load case .. 11 7.3 Force F2 and corresponding load case .. 12 8 Rudder bending moment and reactions at bearings , 13 8.1 General.... 13 8.2 Analysis of spade rudder (Type I) ... 13 8.3 Analysis of skeg rudders (Types II to V) ... 14 9 Rudder design torque, T .... 10 Rudder and rudder stock design 17 10.1 Load bearing parts of the rudder .. 17 10.2 Metal rudder stock material... 17 10.3 Design stress for metal rudder stock...... 18 10.4 Reguireddiameterforsolidcircularmetalrudderstocks 18 10.5 Vertical variation of the diameter of a Type I rudder (spade). 18 10.6 Round tubular stocks ... 19 10.7 Non-circular metal rudder stocks .. 20 10.8 Simple non-isotropic rudder stocks (e.g. wood or FRP)... 21 10.9 Complex structural rudders and rudder stocks in composite .... 21 10.10 Check of deflection of Type I rudder stocks between bearings ... 21 11 Equivalent diameter at the level of notches.... 22 12 Rudder bearings, pintles and gudgeons, 22 12.1 Bearing arrangement..... 22 12.2 Clearance between stock and bearings 23 13 Rudder stock structure and rudder construction .24 13.1 Rudder stock structure.. 24 13.2 Rudder construction.... 13.3 FRP rudder blades.. 24 13.4 Non-FRP rudder blades... 25 14 Skeg structure.. .25 14.1 25 14.2 Design stress Annex A (normative) Metal for rudder stock..... Copyright International Organizationfrstandardizalionghtsreserved ili se from IHS Not for Resale