ISO INTERNATIONAL STANDARD 12217-2 Fourth edition 2022-12 Small craft - Stability and buoyancy assessment and categorization - Part 2: Sailing boats of hull length greater than or equal to 6 m Petits navires - Evaluation et categorisation de la stabilité et de la flottabilite- Partie 2: Bateaux d voiles d'une longueur de coque superieure ou égale a 6 m Reference number ISO 12217-2:2022(E) Tso @ ISO 2022 IS0 12217-2:2022(E) COPYRIGHT PROTECTED DOCUMENT @ISO2022 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on or IsoO's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2022 - All rights reserved IS0 12217-2:2022(E) wx:ivd-by Contents Page Foreword ..V Introduction. vi 1 Scope. .1 2 Normative references 1 3 Terms and definitions .2 3.1 Primary .2 3.2 Hazards .4 3.3 Downflooding 4 3.4 Dimensions, areas and angles. .5 3.5 Condition, mass and volume.. .6 3.6 Other terms and definitions 9 Symbols.. .12 5 Procedure. .13 5.1 Maximum load .13 5.2 Sailing or non-sailing .13 5.3 Tests, calculations and requirements to be applied 13 5.4 Variation in input parameters 14 6 Requirements for monohull boats .14 6.1 Requirements to be applied. .14 6.2 Downflooding. 15 6.2.1 Downflooding openings 15 6.2.2 Downflooding height.. .18 6.2.3 Downflooding angle 19 6.3 Recess size 19 6.3.1 Application. 19 6.3.2 Simplified methods 20 6.3.3 Direct calculation method .22 6.4 Minimum righting energy 22 6.5 Angle of vanishing stability 23 6.5.1 General 23 6.5.2 Normal requirement 23 6.5.3 Alternative requirement for design category B 23 6.6 Stability index (STIX) 24 6.6.1 Method. 24 6.6.2 Dynamic stability factor (FDS) 25 6.6.3 Inversion recovery factor (FIR) 25 6.6.4 Knockdown recovery factor (FKR) 25 6.6.5 Displacement-length factor (FDL) 26 6.6.6 Beam-displacement factor (FBD) 26 6.6.7 Wind moment factor (FWM) 26 6.6.8 Downflooding factor (FDF) 27 6.6.9 Calculation of the stability index (STIX) 27 6.7 Knockdown-recovery test. 27 6.8 Wind stiffness test 28 6.8.1 General 28 6.8.2 Practicaltest 28 6.8.3 Compliance by calculation 30 6.8.4 Requirements. 31 6.9 Flotation requirements 32 6.10 Capsize-recoverytest 32 6.11 Detection and removal of water. .34 7 Requirements for catamarans, trimarans and form-stable monohulls .35 @ IS0 2022 - All rights reserved ii IS0 12217-2:2022(E) 7.1 Requirements to be applied. 35 7.2 Downflooding openings 35 7.3 Downflooding height. 35 7.4 Recesssize 35 7.5 Stability information 35 7.6 Safety signs. 36 7.7 Bare poles factor 37 7.8 Rolling in breaking waves 37 7.9 Pitchpoling 38 7.10 Diagonal stability 38 7.11 Habitable multihull boats 38 7.12 Buoyancy when inverted. 40 7.13 Escape after inversion.. 41 8 Safety signs 42 Application .42 9.1 Deciding the design category 42 9.2 Meaning of the design categories 42 Annex A (normative) Full method for required downflooding height. 44 Annex B (normative) Methods for calculating downflooding angle .46 Annex C (normative) Determining the curve of righting moments .48 Annex D (normative) Method for calculating reserve of buoyancy after inversion or swamping. 51 Annex E (normative) Flotation material and elements. .53 Annex F (normative) Information for the craft's owner's manual 55 Annex G (normative) Determination of safe wind speed information 59 Annex H (normative) Determination of longitudinal righting characteristics 62 Annex I (informative) Summary of requirements .65 Annex J (informative) Worksheets .68 Annex K (informative) Illustration of recess retention level .87 Bibliography 88 iv @ IS0 2022 - All rights reserved IS0 12217-2:2022(E) Foreword Iso (the International Organization for Standardization