EN ISO 12217-2:2017

Small craft - Stability and buoyancy assessment and categorization - Part 2: Sailing boats of hull length greater than or equal to 6 m (ISO 12217-2:2015)

ISO 12217-2:2015 specifies methods for evaluating the stability and buoyancy of intact (i.e. undamaged) boats. The flotation characteristics of boats susceptible to swamping are also encompassed.
The evaluation of stability and buoyancy properties using ISO 12217-2:2015 will enable the boat to be assigned to a design category (A, B, C or D) appropriate to its design and maximum load.
ISO 12217-2:2015 is principally applicable to boats propelled primarily by sail (even if fitted with an auxiliary engine) of 6 m up to and including 24 m hull length. However, it can also be applied to boats less than 6 m if they are habitable multihulls or may be applied if they do not attain the desired design category specified in ISO 12217‑3 and they are decked and have quick-draining recesses which comply with ISO 11812.
In relation to habitable multihulls, ISO 12217-2:2015 includes assessment of susceptibility to inversion, definition of viable means of escape and requirements for inverted flotation.
ISO 12217-2:2015 excludes:
       inflatable and rigid-inflatable boats covered by ISO 6185, except for references made in ISO 6185 to specific clauses of ISO 12217;
       gondolas and pedalos;
       surfboards including sailing surfboards; and
       hydrofoils and foil stabilized boats when not operating in the displacement mode.
ISO 12217-2:2015 does not include or evaluate the effects on stability of towing, fishing, dredging or lifting operations, which need to be separately considered if appropriate.

Kleine Wasserfahrzeuge - Stabilitäts- und Auftriebsbewertung und Kategorisierung - Teil 2: Segelboote ab 6 m Rumpflänge (ISO 12217-2:2015)

Petits navires - Évaluation et catégorisation de la stabilité et de la flottabilité - Partie 2: Bateaux à voiles d'une longueur de coque supérieure ou égale à 6 m (ISO 12217-2:2015)

L'ISO 12217-2:2015 spécifie les méthodes d'évaluation de la stabilité et de la flottabilité des bateaux à l'état intact (c'est à dire non endommagés). Les caractéristiques de flottabilité des bateaux  susceptibles d'envahissement sont également considérées.
L'évaluation des propriétés de stabilité et de flottabilité effectuée à l'aide de l'ISO 12217-2:2015 permettra d'attribuer à un bateau une catégorie de conception (A, B, C ou D) appropriée à sa conception et à sa charge maximale.
L'ISO 12217-2:2015 est principalement applicable aux bateaux propulsés majoritairement par des voiles (même s'ils sont équipés d'un moteur auxiliaire), d'une longueur de coque de 6 m à 24 m inclus. Elle peut cependant être appliquée aux bateaux de moins de 6 m, s'ils sont des multicoques habitables ou s'ils n'atteignent pas la catégorie de conception désirée spécifiée par l'ISO 12217‑3 et s'ils sont pontés et munis de cavités rapidement autovideuses conformes à l'ISO 11812.
Pour ce qui concerne les multicoques habitables, l'ISO 12217-2:2015 comprend l'évaluation de la susceptibilité d'inversion, la définition d'un moyen d'échappée viable et les exigences de flottabilité à l'état inversé.
L'ISO 12217-2:2015 exclut:
       les bateaux pneumatiques et semi-rigides couverts par l'ISO 6185, excepté lorsque l'ISO 6185 fait référence à des articles spécifiques de l'ISO 12217;
       les gondoles et pédalos;
       les planches de surf et planches à voiles; et
       les hydrofoils et les bateaux stabilisés par des plans porteurs lorsqu'ils ne sont pas en mode à déplacement.
L'ISO 12217-2:2015 n'inclut ni n'évalue les effets sur la stabilité provenant du remorquage, de la pêche, du dragage ou d'opérations de levage, qu'il est nécessaire de considérer séparément.

Mala plovila - Stabilnost in ocena vzgona ter kategorizacija - 2. del: Jadrnice s trupom, večjim ali enakim 6 m (ISO 12217-2:2015)

Standard ISO 12217-2:2015 določa metode za oceno stabilnosti in vzgona brezhibnih (nepoškodovanih) čolnov. Zajete so tudi značilnosti plovnosti čolnov, ki so izpostavljeni zalivanju.
Ocena stabilnosti in vzgona z uporabo standarda ISO 12217-2:2015 bo omogočila, da bo čoln vključen v konstrukcijsko kategorijo (A, B, C ali D), ki je ustrezna glede na konstrukcijo in največjo obremenitev.
Standard ISO 12217-2:2015 se uporablja predvsem za čolne na jadra (tudi če imajo nameščen pomožni motor) z dolžino trupa od 6 do vključno 24 m. Uporablja se lahko tudi za čolne, krajše od 6 m, če so večtrupna bivalna plovila, ali kadar niso razvrščeni v želeno konstrukcijsko kategorijo, določeno v standardu ISO 12217-3, in imajo krov ter žlebove za hitro odvodnjavanje, ki so v skladu s standardom ISO 11812.
V povezavi z večtrupnimi bivalnimi plovili standard ISO 12217-2:2015 vključuje oceno izpostavljenosti prevrnitvi, navedbo ustreznih možnosti umika in zahteve za plovnost v prevrnjenem stanju.
ISO 12217-2:2015 se ne uporablja za:
napihljive čolne in napihljive čolne, ki imajo v spodnjem delu trupa togo enoto, ki jih obravnava standard ISO 6185, razen pri sklicih iz standarda ISO 6185 na določene točke standarda ISO 12217;
gondole in čolne na pedala;
deske, vključno z deskami na motorni pogon; ter
hidrogliserje in čolne s stabilizacijskimi flapi, kadar ne delujejo v načinu izpodriva.
ISO 12217-2:2015 ne vključuje ali ne vrednoti vpliva na stabilnost pri vlečenju, ribolovu, črpanju ali dvigovanju, pri katerih je treba ustreznost stabilnosti obravnavati posamezno.

General Information

• Status: Withdrawn
• Publication Date: 26-Sep-2017
• Withdrawal Date: 04-Nov-2025
• ICS: 47.080 - Small craft
• Technical Committee: CEN/TC 464 - Small Craft
• Drafting Committee: CEN/TC 464 - Small Craft
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 27-Sep-2017
• Due Date: 15-Mar-2018
• Completion Date: 27-Sep-2017
• Directive: 2013/53/EU - Directive 2013/53/EU of the European Parliament and of the Council of 20 November 2013 on recreational craft and personal watercraft and repealing Directive 94/25/EC
• Mandate: M/542 - [C(2015)8736] Standardisation Request to the European Committee for Standardisation and the European Committee for Electro-technical Standardisation as regards recreational craft and personal watercraft in support of Directive 2013/53/EU of the European Parliament and of the Council of 20 November 2013 on recreational craft and personal watercraft and repealing Directive 94/25/EC.
• Ref Project: SIST EN ISO 12217-2:2017 - Small craft - Stability and buoyancy assessment and categorization - Part 2: Sailing boats of hull length greater than or equal to 6 m (ISO 12217-2:2015)

Relations

• Replaces: EN ISO 12217-2:2015 - Small craft - Stability and buoyancy assessment and categorization - Part 2: Sailing boats of hull length greater than or equal to 6 m (ISO 12217-2:2015)
• Effective Date: 15-Jun-2016
• Replaced By: EN ISO 12217-2:2025 - Small craft - Stability and buoyancy assessment and categorization - Part 2: Sailing boats of hull length greater than or equal to 6 m (ISO 12217-2:2022)
• Effective Date: 21-Aug-2019

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2017
1DGRPHãþD
SIST EN ISO 12217-2:2016
0DODSORYLOD6WDELOQRVWLQRFHQDY]JRQDWHUNDWHJRUL]DFLMDGHO-DGUQLFHV
WUXSRPYHþMLPDOLHQDNLPP,62
Small craft - Stability and buoyancy assessment and categorization - Part 2: Sailing
boats of hull length greater than or equal to 6 m (ISO 12217-2:2015)
Kleine Wasserfahrzeuge - Stabilitäts- und Auftriebsbewertung und Kategorisierung - Teil
2: Segelboote ab 6 m Rumpflänge (ISO 12217-2:2015)
Petits navires - Évaluation et catégorisation de la stabilité et de la flottabilité - Partie 2:
Bateaux à voiles d'une longueur de coque supérieure ou égale à 6 m (ISO 12217-
2:2015)
Ta slovenski standard je istoveten z: EN ISO 12217-2:2017
ICS:
47.080 ýROQL Small craft
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 12217-2
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2017
EUROPÄISCHE NORM
ICS 47.080 Supersedes EN ISO 12217-2:2015
English Version
Small craft - Stability and buoyancy assessment and
categorization - Part 2: Sailing boats of hull length greater
than or equal to 6 m (ISO 12217-2:2015)
Petits navires - Évaluation et catégorisation de la Kleine Wasserfahrzeuge - Stabilitäts- und
stabilité et de la flottabilité - Partie 2: Bateaux à voiles Auftriebsbewertung und Kategorisierung - Teil 2:
d'une longueur de coque supérieure ou égale à 6 m Segelboote ab 6 m Rumpflänge (ISO 12217-2:2015)
(ISO 12217-2:2015)
This European Standard was approved by CEN on 23 July 2017.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12217-2:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2013/53/EU aimed to be covered . 4

European foreword
The text of ISO 12217-2:2015 has been prepared by Technical Committee ISO/TC 188 “Small craft” of
the International Organization for Standardization (ISO) and has been taken over as EN
ISO 12217-2:2017.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by March 2018, and conflicting national standards shall
be withdrawn at the latest by March 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 12217-2:2015.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this
document.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 12217-2:2015 has been approved by CEN as EN ISO 12217-2:2017 without any
modification.
Annex ZA
(informative)
Relationship between this European Standard and the essential
requirements of Directive 2013/53/EU aimed to be covered
This European Standard has been prepared under a Commission’s standardization request
M/542/C(2015) 8736 final to provide one voluntary means of conforming to essential requirements of
Directive 2013/53/EU.
Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZA.1 confers, within the limits of
the scope of this standard, a presumption of conformity with the corresponding essential requirements
of that Directive, and associated EFTA regulations.
Table ZA.1 — Correspondence between this European Standard and
Annex I of Directive 2013/53/EU
Essential Requirements of Clause(s)/sub-clause(s) Remarks/Notes
Directive 2013/53/EU of this EN
I.A.1 - Watercraft Design Clause 5; 6; 7; 9; Table 11; The evaluation of stability and
Categories buoyancy properties using
Annex I
ISO 12217-2 will enable boats
propelled primarily by sail (even
if fitted with an auxiliary engine)
of 6 m to 24 m hull length to be
assigned to a design category (A,
B, C or D) appropriate to its
design and maximum load.
Design categories A, B, C and D
defined in this standard
correspond to design categories
A, B, C and D of Directive
2013/53/EU.
I.A.2.3.2 - Stability and Freeboard Clause 5, 6, 7
Annexes A, B, C, D, G, H
I.A.2.3.3 - Buoyancy and flotation 6.9, 7.12, Includes requirements for
inverted flotation.
Annexes D, E
I.A.2.3.5 - Flooding Clause 6.2, 7.2 and 7.3 In respect of watertight integrity
and downflooding openings
Annex A, B
including ventilation openings
and fittings.
I.A.2.3.6 - Maximum Clause 5, 6 and 7
recommended load
I.A.2.3.8 - Escape Clauses 7.11 and 7.13 In relation to habitable
multihulls, these clauses include
an assessment of susceptibility to
inversion and viable means of
escape after inversion.
This standard does not include
means of escape in the event of
fire.
I.A.2.2.5 - Owner’s manual Annex F

WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European
Standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
INTERNATIONAL ISO
STANDARD 12217-2
Third edition
2015-10-15
Small craft — Stability and buoyancy
assessment and categorization —
Part 2:
Sailing boats of hull length greater
than or equal to 6 m
Petits navires — Évaluation et catégorisation de la stabilité et de la
flottabilité —
Partie 2: Bateaux à voiles d’une longueur de coque supérieure ou
égale à 6 m
Reference number
ISO 12217-2:2015(E)
©
ISO 2015
ISO 12217-2:2015(E)
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, 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 the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2015 – All rights reserved

ISO 12217-2:2015(E)
Contents Page
Foreword .v
Introduction .vii
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
4 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 .14
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 .22
6.5.1 Normal requirement .23
6.5.2 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 .28
6.8 Wind stiffness test .29
6.8.1 General.29
6.8.2 Practical test .29
6.8.3 Compliance by calculation .30
6.8.4 Requirements .30
6.9 Flotation requirements .31
6.10 Capsize-recovery test .32
6.11 Detection and removal of water .33
7 Requirements for catamarans, trimarans and form-stable monohulls .34
7.1 Requirements to be applied .34
ISO 12217-2:2015(E)
7.2 Downflooding openings .34
7.3 Downflooding height .34
7.4 Recess size .34
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 .37
7.10 Diagonal stability .38
7.11 Habitable multihull boats .38
7.12 Buoyancy when inverted .39
7.13 Escape after inversion .40
8 Safety signs .41
9 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 .47
Annex C (normative) Determining the curve of righting moments .50
Annex D (normative) Method for calculating reserve of buoyancy after inversion or swamping .53
Annex E (normative) Flotation material and elements .55
Annex F (normative) Information for owner’s manual .57
Annex G (normative) Determination of safe wind speed information .61
Annex H (normative) Determination of longitudinal righting characteristics .64
Annex I (informative) Summary of requirements .67
Annex J (informative) Worksheets .70
Annex K (informative) Illustration of recess retention level .89
Bibliography .90
iv © ISO 2015 – All rights reserved

ISO 12217-2:2015(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information.
The committee responsible for this document is ISO/TC 188, Small craft.
This third edition cancels and replaces the second edition (ISO 12217-2:2013), of which it constitutes a
minor revision. It incorporates the following modifications:
— Introduction: the reference to the European Directive has been updated (2013/53/EU);
— Clause 1, 6.2.1.6 d) 3), 7.6, 7.11, 7.12, 7.13, Annex I, Table I.2, and Annex J, Worksheets 2, 12, 14 and
16: vulnerable has been replaced with susceptible;
— Clause 3: definitions 3.1.1, 3.5.5, 3.5.6 and 3.6.11 have been amended;
— Subclause 6.3.1: second item in the list has been inserted;
— Subclauses 6.3.2.3 and 6.3.2.4: formulae coefficients have been corrected;
— Subclause 6.6.2: exponent ‘0,3’ has been deleted;
— Subclause 6.6.7: symbols have been corrected;
— Subclause 6.6.8: a note has been added to explain the phrase “fully flooded with water”;
— Clause 9.2: the text and Table 11 have been amended;
— Subclause H.3.2 c): the coefficient in the formula has been corrected;
— Annex J: worksheets 1, 2, 5, 7, 12 and 16 have been corrected to align with corrections listed above;
— Annex K has been added;
— Bibliography: reference to ISO 7010 has been added;
— Editorial and cross-referencing corrections have been made to Table 1, Annex J, worksheets 1, 5, 7,
12, 14 and 16, and to subclauses 6.3.1, 6.3.2.2 and 6.3.2.3.
ISO 12217-2:2015(E)
ISO 12217 consists of the following parts, under the general title Small craft — Stability and buoyancy
assessment and categorization:
— Part 1: Non-sailing boats of hull length greater than or equal to 6 m
— Part 2: Sailing boats of hull length greater than or equal to 6 m
— Part 3: Boats of hull length less than 6 m
vi © ISO 2015 – All rights reserved

ISO 12217-2:2015(E)
Introduction
This part of ISO 12217 enables the determination of limiting environmental conditions for which an
individual boat has been designed.
It enables the boat to be assigned to a design category appropriate to its design and maximum load.
The design categories used align with those in the Recreational Craft Directive of the European Union,
EU Directive 2013/53/EU.
Annex J provides worksheets to assist in the systematic assessment of a boat according to this part
of ISO 12217.
INTERNATIONAL STANDARD ISO 12217-2:2015(E)
Small craft — Stability and buoyancy assessment and
categorization —
Part 2:
Sailing boats of hull length greater than or equal to 6 m
CAUTION — Compliance with this part of ISO 12217 does not guarantee total safety or total
freedom of risk from capsize or sinking.
IMPORTANT — The electronic file of this document contains colours which are considered to be
useful for the correct understanding of the document. Users should therefore consider printing
this document using a colour printer.0
1 Scope
This part of ISO 12217 specifies methods for evaluating the stability and buoyancy of intact (i.e.
undamaged) boats. The flotation characteristics of boats susceptible to swamping are also encompassed.
The evaluation of stability and buoyancy properties using this part of ISO 12217 will enable the boat to
be assigned to a design category (A, B, C or D) appropriate to its design and maximum load.
This part of ISO 12217 is principally applicable to boats propelled primarily by sail (even if fitted with
an auxiliary engine) of 6 m up to and including 24 m hull length. However, it can also be applied to boats
less than 6 m if they are habitable multihulls or may be applied if they do not attain the desired design
category specified in ISO 12217-3 and they are decked and have quick-draining recesses which comply
with ISO 11812.
In relation to habitable multihulls, this part of ISO 12217 includes assessment of susceptibility to
inversion, definition of viable means of escape and requirements for inverted flotation.
This part of ISO 12217 excludes:
— inflatable and rigid-inflatable boats covered by ISO 6185, except for references made in ISO 6185 to
specific clauses of ISO 12217;
— gondolas and pedalos;
— surfboards including sailing surfboards; and
— hydrofoils and foil stabilized boats when not operating in the displacement mode.
NOTE Displacement mode means that the boat is only supported by hydrostatic forces.
It does not include or evaluate the effects on stability of towing, fishing, dredging or lifting operations,
which need to be separately considered if appropriate.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 2896:2001, Rigid cellular plastics — Determination of water absorption
ISO 12217-2:2015(E)
ISO 3864-1, Graphical symbols — Safety colours and safety signs — Part 1: Design principles for safety
signs and safety markings
ISO 8666, Small craft — Principal data
ISO 9093-1, Small craft — Seacocks and through-hull fittings — Part 1: Metallic
ISO 9093-2, Small craft — Seacocks and through-hull fittings — Part 2: Non-metallic
ISO 9094 (all parts), Small craft — Fire protection
ISO 10240, Small craft — Owner’s manual
ISO 11812, Small craft — Watertight cockpits and quick-draining cockpits
ISO 12216, Small craft — Windows, portlights, hatches, deadlights and doors — Strength and
watertightness requirements
ISO 12217-1:2015, Small craft — Stability and buoyancy assessment and categorization — Part 1: Non-
sailing boats of hull length greater than or equal to 6 m
ISO 12217-3:2015, Small craft — Stability and buoyancy assessment and categorization — Part 3: Boats of
hull length less than 6 m
ISO 14946, Small craft — Maximum load capacity
ISO 15083, Small craft — Bilge-pumping systems
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE The meanings of certain symbols used in the definitions are given in Clause 4.
3.1 Primary
3.1.1
design category
description of the sea and wind conditions for which a boat is assessed to be suitable
Note 1 to entry: See also 9.2.
3.1.2
sailing boat
boat for which the primary means of propulsion is by wind power, having reference sail area (3.4.8)
2/3
A ≥ 0,07(m )
S LDC
Note 1 to entry: m is the mass of the boat in the maximum load condition, expressed in kilograms.
LDC
3.1.3
catamaran
boat with two main load-bearing hulls
EXAMPLE Boats with a centreline or bridge-deck nacelle which supports less than 30 % of the mass in the
maximum load condition are considered to be catamarans. Proas are asymmetric catamarans.
3.1.4
trimaran
boat with a centre main hull and two sidehulls in which the centre hull, when the boat is upright,
supports 30 % or more of the mass in the maximum load condition
2 © ISO 2015 – All rights reserved

ISO 12217-2:2015(E)
3.1.5
recess
volume open to the air that might retain water within the range of loading conditions and
corresponding trims
EXAMPLE Cockpits, wells, open volumes or areas bounded by bulwarks or coamings.
Note 1 to entry: Cabins, shelters or lockers provided with closures according to the requirements of ISO 12216
are not recesses.
Note 2 to entry: Cockpits that are open aft to the sea are considered to be recesses. Flush decks without bulwarks
or coamings are not recesses.
3.1.6
quick-draining recess
recess fulfilling all the requirements of ISO 11812 for “quick-draining cockpits and recesses”
Note 1 to entry: According to its characteristics, a cockpit may be considered to be quick-draining for one design
category, but not for a higher category.
Note 2 to entry: ISO 11812 contains requirements with which most sailing dinghies cannot comply.
3.1.7
watertight recess
recess fulfilling all the requirements of ISO 11812 for “watertight cockpits and recesses”
Note 1 to entry: This term only implies requirements in respect of watertightness and sill heights, but not those
for drainage.
3.1.8
fully enclosed boat
boat in which the horizontal projection of the sheerline area comprises any combination of
— watertight deck and superstructure, and/or
— quick-draining recesses which comply with ISO 11812, and/or
— watertight recesses complying with ISO 11812 with a combined volume of less than (L B F )/40, and
H H M
all closing appliances have their degree of watertightness in accordance with ISO 12216
Note 1 to entry: The size of recesses permitted for boats of design category A, B or some boats of design category
C is restricted by the requirements of 6.3.
3.1.9
habitable boat
boat having a fully enclosed cabin with rigid roof fitted with one or more bunks, benches,
pipecots, hammocks or similar locations that can be used for sleeping when the boat is under way
Note 1 to entry: A boat is considered to be “habitable” if a fabric closure is used instead of a rigid door, or the
cabin has fabric sides.
Note 2 to entry: The following are not considered to render a boat “habitable”:
— a cockpit tent, or
— an open-sided cuddy intended to provide limited protection from spray, provided it is not fitted with fabric
closures all round.
Note 3 to entry: Locations used for sleeping have minimum dimensions of 1,5 m diagonal length, 0,4 m width
at the widest point, and with a minimum headroom of 0,4 m over the length. The cabin sole and compartments
designated by the builder to be used exclusively for storage and referenced in the owner’s manual are not included.
ISO 12217-2:2015(E)
3.1.10
habitable part of a boat
spaces within a habitable boat with rigid roof that are fitted with a toilet or in which there is provision
for any of the following activities: sitting, sleeping, cooking, eating, washing, navigation, steering
Note 1 to entry: Compartments designated by the builder to be used exclusively for storage and referenced in the
owner’s manual are not included.
3.2 Hazards
3.2.1
capsize
event when a boat reaches any heel angle from which it is unable to recover to equilibrium near the
upright without intervention
3.2.2
knockdown
event when a boat reaches a heel angle sufficient to immerse the masthead, and from which it may or
may not recover without intervention
3.2.3
inversion
event when a boat becomes upside down
3.3 Downflooding
3.3.1
downflooding opening
opening in the hull or deck (including the edge of a recess) that might admit water into the interior or
bilge of a boat, or a recess, apart from those excluded in 6.2.1.6
3.3.2
downflooding angle
ϕ
D
angle of heel at which downflooding openings (apart from those excluded in 6.2.1.6) become immersed,
when the boat is in calm water and in the appropriate loading condition at design trim
Note 1 to entry: Where openings are not symmetrical about the centreline of the boat, the case resulting in the
smallest angle is used.
Note 2 to entry: The following are specifically considered:
— ϕ is the downflooding angle to any downflooding opening;
D
— ϕ is the angle of heel at which openings which are not marked “KEEP SHUT WHEN UNDER WAY” having
DA
a combined total area, expressed in square centimetres (cm ), greater than the number represented by
1,2L B F first become immersed;
H H M
— ϕ is the downflooding angle at which recesses which are not quick-draining begin to fill with water;
DC
— ϕ is the downflooding angle at which any main access hatch (i.e. having an opening area greater than
DH
0,18 m each) giving direct access to the main open air helm position first begins to become immersed.
Note 3 to entry: Downflooding angle is expressed in degrees.
4 © ISO 2015 – All rights reserved

ISO 12217-2:2015(E)
3.3.3
downflooding height
h
D
smallest height above the waterline to any downflooding opening, apart from those excluded in 6.2.1.6,
when the boat is upright in calm water and in the maximum load condition, measured to the critical
downflooding point which might be within pipes or ducts inside the hull
Note 1 to entry: Downflooding height is expressed in metres.
Note 2 to entry: See Figure B.1
3.4 Dimensions, areas and angles
3.4.1
length of hull
L
H
length of the hull measured according to ISO 8666
Note 1 to entry: Length of hull is expressed in metres.
3.4.2
length waterline
L
WL
waterline length measured according to ISO 8666 when the boat is upright in calm water, in the
appropriate loading condition and at design trim
Note 1 to entry: For multihull boats, L relates to that of the longest individual hull.
WL
Note 2 to entry: Length waterline is expressed in metres.
3.4.3
beam of hull
B
H
maximum beam of the hull using the method of ISO 8666; for catamaran and trimaran boats, maximum
beam across the outer hulls
Note 1 to entry: Beam of hull is expressed in metres.
3.4.4
beam waterline
B
WL
greatest beam measured according to ISO 8666 at the waterline in calm water which, for multihull
boats, is the sum of the maximum waterline beams of each of the hulls, the boat being upright, in the
appropriate loading condition and at design trim
Note 1 to entry: Beam waterline is expressed in metres.
3.4.5
beam between hull centres
B
CB
on catamaran and trimaran boats, the transverse distance between the centres of buoyancy of the
outer hulls
Note 1 to entry: Beam between hull centres is expressed in metres.
ISO 12217-2:2015(E)
3.4.6
freeboard amidships
F
M
distance of the sheerline or deck above the waterline at L /2 measured according to ISO 8666, the
WL
boat being upright, in the appropriate loading condition and at design trim
Note 1 to entry: Freeboard amidships is expressed in metres.
Note 2 to entry: Where no loading condition is specified, maximum load condition should be assumed.
3.4.7
draught of canoe body
T
C
draught of the main buoyant part of the hull(s) below the waterline, as defined in ISO 8666, the boat
being upright in the appropriate loading condition and at design trim
Note 1 to entry: Draught of canoe body excludes appendages such as rudders or skegs, and is expressed in metres.
3.4.8
reference sail area
A
S
actual profile area of sails set abaft a mast, plus the maximum profile areas of all masts, plus reference
triangle area(s) forward of each mast as defined in ISO 8666
Note 1 to entry: Sail area is expressed in square metres.
3.4.9
standard sail area
A′
S
actual profile area of the largest sail plan suitable for windward sailing in true winds of 10–12 kn (5,1–
6,2 m/s), including overlaps, and supplied or recommended by the builder as standard
Note 1 to entry: Sail area is expressed in square metres.
3.4.10
angle of vanishing stability
ϕ
V
angle of heel nearest the upright (other than upright) in the appropriate loading condition at which the
transverse stability righting moment is zero
Note 1 to entry: This is determined assuming that there is no offset load, and that all potential downflooding
openings are considered to be watertight.
Note 2 to entry: Where a boat has recesses which are not quick-draining, ϕ is to be taken as the downflooding
V
angle to these recesses, unless the loss of buoyancy due to such recesses is fully accounted for in determining ϕ .
V
Note 3 to entry: Angle of vanishing stability is expressed in degrees.
3.5 Condition, mass and volume
3.5.1
empty craft condition
empty boat including fittings and equipment as listed below but excluding all optional equipment and
fittings not included in the manufacturer’s basic outfit:
a) structure: comprising all the structural parts, including any fixed ballast keel and/or drop
keel/centreboard/daggerboard(s) and rudder(s);
b) ballast: any fixed ballast installed;
6 © ISO 2015 – All rights reserved

ISO 12217-2:2015(E)
c) internal structure and accommodation: bulkheads and partitions, insulation, lining, built-in
furniture, flotation material, windows, hatches and doors, permanently installed mattresses and
upholstery materials;
d) permanently installed engine(s) and fuel system: comprising inboard engine(s), including all supplies
and controls as needed for their operation, permanently installed fuel systems, including tanks;
e) fluids in permanently installed systems: residual working fluids as needed for their operation (see
examples below), but excluding contents of fluid ballast systems and tanks, and main storage tanks
(which are included in maximum load);
EXAMPLES: fluids in hot or cold water, fuel, lubricating or hydraulic oil systems
f) internal equipment, including:
— all items of equipment permanently attached to the craft, e.g. tanks, toilet system(s), water
transfer equipment;
— bilge pumping system(s), cooking and heating devices, cooling equipment, ventilation system(s);
— electrical installation and equipment, including permanently installed batteries mounted in the
position intended by the builder;
— fixed navigational and electronic equipment;
— fixed fire fighting equipment, where fitted;
g) external equipment, including:
— all permanently attached standard or specified deck fittings, e.g. guardrails, pulpits and
pushpits, bowsprits and their attachments, bathing platforms, boarding ladders, steering
equipment, winches, sprayhood(s);
— awning(s), cockpit tables, gratings, signal mast(s), where fitted;
— mast(s), boom(s), spinnaker poles and other pole(s), standing and running rigging, in the stowed
position rea
...