SIST EN ISO 12215-7:2021

Small craft - Hull construction and scantlings - Part 7: Determination of loads for multihulls and of their local scantlings using ISO 12215-5 (ISO 12215-7:2020)

This document defines the dimensions, local design pressures and global loads acting on multihull
craft with a hull length (LH) or load line length of up to 24 m (see Note). It considers all parts of the
craft that are assumed watertight or weathertight when assessing stability, freeboard and buoyancy in
accordance with ISO 12217 (all parts). Scantlings corresponding to the local design pressures are then
assessed using ISO 12215-5.
NOTE The load line length is defined in the OMI "International Load Lines Convention 1966/2005", it can
be smaller than LH for craft with overhangs. This length also sets up at 24 m the lower limit of several IMO
conventions.
This document is applicable to multihulls built from the same materials as in ISO 12215-5, in intact
condition, and of the two following types:
— recreational craft, including recreational charter vessels;
— commercial craft and workboats.
It is not applicable to multihull racing craft designed only for professional racing.
This document is applicable to the structures supporting windows, portlights, hatches, deadlights
and doors.
For the complete scantlings of the craft, this document is intended to be used in conjunction with
ISO 12215-8 for rudders, ISO 12215-9 for appendages of sailing craft and ISO 12215-10 for rig loads and
rig attachment in sailing craft. ISO 12215-6 can be used for additional details.
Throughout this document, unless otherwise specified, dimensions are in (m), areas in (m2), masses
in (kg), forces in (N), moments in (Nm), Pressures in (kN/m2) (1 kN/m2 = 1 kPa), stresses and elastic
modulus in (N/mm2) (1 N/mm2 = 1 MPa).

Kleine Wasserfahrzeuge - Rumpfbauweise und Dimensionierung - Teil 7: Bestimmung der Lasten für Mehrrumpffahrzeuge und ihrer lokalen Dimensionierungen unter Anwendung der ISO 12215-5 (ISO 12215-7:2020)

Dieses Dokument definiert die Abmessungen, lokalen Entwurfsdrücke und globalen Lasten, die auf Mehrrumpfboote mit einer Rumpflänge (LH) oder Länge der Konstruktionswasserlinie von bis zu 24 m wirken (siehe Anmerkung). Es berücksichtigt alle Teile des Wasserfahrzeugs, die bei der Beurteilung der Stabilität, des Freibords und des Auftriebs in Übereinstimmung mit ISO 12217 (alle Teile) als wasserdicht oder witterungsbeständig angenommen werden. Wasserfahrzeuge, die den lokalen Entwurfsdrücken entsprechen, werden anschließend nach ISO 12215 5 geprüft.
ANMERKUNG Die Länge der Konstruktionswasserlinie ist in der „International Load Lines Convention 1966/2005“ der IMO festgelegt und kann bei Wasserfahrzeugen mit Überhang kleiner als LH sein. Diese Länge legt darüber hinaus bei 24 m die untere Grenze verschiedener IMO Konventionen fest.
Dieses Dokument gilt für Mehrrumpfboote, die aus denselben Werkstoffen wie in ISO 12215 5 gebaut sind und im intakten Zustand sind sowie einem der beiden folgenden Typen angehören:
- Sportboote, einschließlich Charter-Sportboote;
- gewerbliche Wasserfahrzeuge und Arbeitsboote.
Es ist nicht auf rein für professionelle Rennen ausgelegte Mehrrumpf Rennboote anwendbar.
Dieses Dokument ist anwendbar auf die Tragwerke von Fenstern, Bullaugen, Klappen, Seeschlagblenden und Türen.
Für die kompletten Dimensionierungen des Wasserfahrzeugs ist dieses Dokument für die Anwendung in Verbindung mit ISO 12215 8 für die Ruder, ISO 12215 9 für die Anhänge von Segelbooten und ISO 12215 10 für Takelagelasten und Takelagezubehör von Segelbooten vorgesehen. ISO 12215 6 kann für weitere Einzelheiten herangezogen werden.
In diesem Dokument, und sofern nicht anders festgelegt, sind die Abmessungen in (m), Flächen in (m2), Massen in (kg), Kräfte in (N), Momente in (Nm), Drücke in (kN/m2) (1 kN/m2 = 1 kPa), Spannungen und Elastizitätsmodule in (N/mm2) (1 N/mm2 = 1 MPa) angegeben.

Petits navires - Construction de la coque et échantillonnage - Partie 7: Détermination des charges des multicoques et de leur échantillonnage local en utilisant l'ISO 12215-5 (ISO 12215-7:2020)

Ce document définit les dimensions, les pressions de conception locales et les charges globales agissant sur les bateaux multicoques d'une longueur de coque (LH) ou une longueur de référence jusqu'à 24 m (voir la Note). Il prend en compte toutes les parties du bateau qui sont considérées étanches à l'eau ou aux intempéries lors de l'évaluation de la stabilité, du franc-bord et de la flottabilité conformément à l'ISO 12217 (toutes les parties). Les échantillonnages correspondant aux pressions nominales locales sont ensuite évalués à l'aide de l'ISO 12215-5.
NOTE       La longueur de référence est définie dans la «Convention internationale sur les lignes de charge 1966/2005» de l'OMI, elle peut être plus petite que LH pour des bateaux ayant des élancements. Cette longueur établit également à 24 m, la limite inférieure de plusieurs Conventions Internationales de l'OMI.
Ce document est applicable aux multicoques construits à partir des mêmes matériaux que dans l'ISO 12215-5 à l'état intact et des deux types suivants:
—          les bateaux de plaisance, y compris les bateaux de location avec skipper («charter»);
—          les bateaux à usage commercial et les bateaux de travail.
Il ne s'applique pas aux multicoques de course conçus uniquement pour les courses avec équipage professionnel.
Ce document est applicable aux structures supportant des fenêtres, hublots, panneaux, tapes et portes.
Pour un échantillonnage complet du bateau, le présent document est destiné à être utilisé conjointement avec l'ISO 12215-8 pour les gouvernails, l'ISO 12215-9 pour les appendices des voiliers et l'ISO 12215-10 pour les charges dans le gréement et les points d'ancrage du gréement. L'ISO 12215-6 peut être utilisée pour des détails supplémentaires.
Dans tout le présent document et sauf spécification contraire, les dimensions sont en (m), les surfaces en (m2), les forces en (N), les moments en (Nm), les pressions en kN/m2 (1kN/m2 = 1 kPa), les contraintes et modules d'élasticité en N/mm2 (1N/mm2 = 1 Mpa).

Mala plovila - Konstrukcija trupa in dimenzioniranje - 7. del: Določanje obremenitev za večtrupna plovila in njihove krajevne dimenzije z uporabo ISO 12215-5 (ISO 12215-7:2020)

General Information

• Status: Published
• Public Enquiry End Date: 05-Feb-2018
• Publication Date: 21-Jan-2021
• ICS: 47.020.10 - Hulls and their structure elements
• ICS: 47.080 - Small craft
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 19-Nov-2020
• Due Date: 24-Jan-2021
• Completion Date: 22-Jan-2021
• 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: EN ISO 12215-7:2020 - Small craft - Hull construction and scantlings - Part 7: Determination of loads for multihulls and of their local scantlings using ISO 12215-5 (ISO 12215-7:2020)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 12215-7:2021
01-februar-2021
Mala plovila - Konstrukcija trupa in dimenzioniranje - 7. del: Določanje
obremenitev za večtrupna plovila in njihove krajevne dimenzije z uporabo ISO
12215-5 (ISO 12215-7:2020)
Small craft - Hull construction and scantlings - Part 7: Determination of loads for
multihulls and of their local scantlings using ISO 12215-5 (ISO 12215-7:2020)
Kleine Wasserfahrzeuge - Rumpfbauweise und Dimensionierung - Teil 7: Bestimmung
der Lasten für Mehrrumpffahrzeuge und ihrer lokalen Dimensionierungen unter
Anwendung der ISO 12215-5 (ISO 12215-7:2020)
Petits navires - Construction de la coque et échantillonnage - Partie 7: Détermination des
charges des multicoques et de leur échantillonnage local en utilisant l'ISO 12215-5 (ISO
12215-7:2020)
Ta slovenski standard je istoveten z: EN ISO 12215-7:2020
ICS:
47.020.10 Ladijski trupi in njihovi Hulls and their structure
konstrukcijski elementi elements
47.080 Čolni Small craft
SIST EN ISO 12215-7:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 12215-7:2021

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SIST EN ISO 12215-7:2021


EN ISO 12215-7
EUROPEAN STANDARD

NORME EUROPÉENNE

November 2020
EUROPÄISCHE NORM
ICS 47.080
English Version

Small craft - Hull construction and scantlings - Part 7:
Determination of loads for multihulls and of their local
scantlings using ISO 12215-5 (ISO 12215-7:2020)
Petits navires - Construction de la coque et Kleine Wasserfahrzeuge - Rumpfbauweise und
échantillonnage - Partie 7: Détermination des charges Dimensionierung - Teil 7: Bestimmung der Lasten für
des multicoques et de leur échantillonnage local en Mehrrumpffahrzeuge und ihrer lokalen
utilisant l'ISO 12215-5 (ISO 12215-7:2020) Dimensionierungen unter Anwendung der ISO 12215-
5 (ISO 12215-7:2020)
This European Standard was approved by CEN on 20 July 2019.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, 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: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12215-7:2020 E
worldwide for CEN national Members.

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SIST EN ISO 12215-7:2021
EN ISO 12215-7:2020 (E)
Contents Page
European foreword . 3

2

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SIST EN ISO 12215-7:2021
EN ISO 12215-7:2020 (E)
European foreword
This document (EN ISO 12215-7:2020) has been prepared by Technical Committee ISO/TC 188 "Small
craft" in collaboration with CCMC.
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 May 2021, and conflicting national standards shall be
withdrawn at the latest by May 2021.
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 has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 12215-7:2020 has been approved by CEN as EN ISO 12215-7:2020 without any
modification.


3

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SIST EN ISO 12215-7:2021

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SIST EN ISO 12215-7:2021
INTERNATIONAL ISO
STANDARD 12215-7
First edition
2020-11
Small craft — Hull construction and
scantlings —
Part 7:
Determination of loads for multihulls
and of their local scantlings using
ISO 12215-5
Petits navires — Construction de la coque et échantillonnage —
Partie 7: Détermination des charges des multicoques et de leur
échantillonnage local en utilisant l'ISO 12215-5
Reference number
ISO 12215-7:2020(E)
©
ISO 2020

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SIST EN ISO 12215-7:2021
ISO 12215-7:2020(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
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 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

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SIST EN ISO 12215-7:2021
ISO 12215-7:2020(E)

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols . 4
5 Application of this document . 6
5.1 Materials . 6
5.2 Limitations . 6
5.3 Overall procedure for the application of this document . 7
6 Main dimensions, data and areas . 7
6.1 Dimensions and data . 7
6.1.1 General. 7
6.1.2 Bottom deadrise of the hulls βx and chine beam B x of planing multihulls . 7
C
6.1.3 Wet deck bottom . 8
6.1.4 Crossbeams . . 8
6.2 Areas .11
7 Dimensions and pressure for panels and stiffeners under local loads .14
7.1 General .14
7.2 Example of application on multihulls .14
7.2.1 Sections .14
7.2.2 Details on panel assessment and dimensions .16
7.2.3 The constant averaged pressure method .16
7.2.4 Other assessment and dimensioning methods .17
7.2.5 Panels acting as "natural" stiffeners .17
7.3 Other topics on panel or stiffener dimensions .17
8 Local pressure-adjusting factors .17
9 Local design pressures .24
9.1 General .24
9.2 Limits of areas .24
9.3 Tables defining the local design pressures for multihulls .24
9.4 Design pressure for trimaran floats P .27
TRFx
9.4.1 Pressure reduction factors .27
9.4.2 Pressure .27
9.5 Design pressure on watertight bulkheads and integral tanks .27
10 Further treatment of structural elements subject to local loads .27
11 Assessment of multihulls rudders, appendages and their wells .28
12 Multihull global loads .28
12.1 General .28
12.2 Typical structural arrangements .28
12.3 Global load assessment .30
12.3.1 General.30
12.3.2 The simplified method .30
12.3.3 The enhanced method . .31
12.4 Design stresses under global loads .32
12.5 Global load case GLC1: Diagonal load in quartering sea .32
12.6 Global load case GLC 2: Rig loads .33
12.7 Combination of diagonal load GLC 1 and rig load GLC 2 for sailing multihulls .33
12.8 Global load case GLC 3: Asymmetric broaching loads in sailing multihulls .33
© ISO 2020 – All rights reserved iii

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SIST EN ISO 12215-7:2021
ISO 12215-7:2020(E)

12.9 Global load case GLC 4: Longitudinal broaching/pitchpoling .34
12.9.1 General.34
12.9.2 Full method of analysis of the buoyancy load when the craft pitchpoles .35
12.10 Global load case GLC 5: Longitudinal force on one hull .36
12.10.1 General.36
12.10.2 Longitudinal force .36
12.11 Global load case GLC 6: Bending of crossbeams connecting hulls for motor catamarans. .37
13 Structural arrangement for supporting global loads .38
14 Multihulls used as commercial craft and workboats .38
15 Information to be included in the owner's manual .38
15.1 General .38
15.2 Respect of maximum loaded displacement .38
15.3 Operational guidance .38
15.4 Information to take care of sandwich plating .38
15.5 Information required by Annex J of ISO 12215-5:2019 - for commercial craft and
workboat .38
Annex A (informative) Application sheet of ISO 12215-7 .39
Annex B (informative) "Established practice" recommendations for global loads
assessment using FEM methods and reporting .41
Annex C (informative) "Established practice" details .43
Annex D (informative) Technical background and example of torsional moment analysis
with differential deflection of crossbeams .51
Bibliography .58
iv © ISO 2020 – All rights reserved

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SIST EN ISO 12215-7:2021
ISO 12215-7:2020(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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 188, Small craft.
A list of all parts in the ISO 12215 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
© ISO 2020 – All rights reserved v

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SIST EN ISO 12215-7:2021
ISO 12215-7:2020(E)

Introduction
The reason underlying the preparation of this document is that standards and recommended
practices for loads on the hull and the dimensioning of small craft differ considerably, thus limiting the
general worldwide acceptability of boat scantlings. This document has been set towards the minimal
requirements of the current practice.
The dimensioning according to this document is regarded as reflecting current practice, provided
the craft is correctly handled in the sense of good seamanship and operated at a speed appropriate
to the prevailing sea state in a safe and responsible manner, having due cognisance of the prevailing
conditions.
Implementation of this document allows to achieve an overall structural strength that ensures the
watertight and weathertight integrity of the craft. This document is intended to be a tool to determine
the scantlings of a craft as per minimal requirements. It is not intended to be a structural design
procedure.
The mechanical property data supplied as default values in this document make no explicit allowance
for deterioration in service nor provide any guarantee that these values can be obtained for any
particular craft.
Like the other parts of ISO 12215, this document was developed to assess the structure of recreational
craft up to 24 m L , but it can also be used, where relevant, for non-recreational craft, workboats or
H
yachts with an IMO load line length of up to 24 m, with the necessary critical mind.
vi © ISO 2020 – All rights reserved

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SIST EN ISO 12215-7:2021
INTERNATIONAL STANDARD ISO 12215-7:2020(E)
Small craft — Hull construction and scantlings —
Part 7:
Determination of loads for multihulls and of their local
scantlings using ISO 12215-5
1 Scope
This document defines the dimensions, local design pressures and global loads acting on multihull
craft with a hull length (L ) or load line length of up to 24 m (see Note). It considers all parts of the
H
craft that are assumed watertight or weathertight when assessing stability, freeboard and buoyancy in
accordance with ISO 12217 (all parts). Scantlings corresponding to the local design pressures are then
assessed using ISO 12215-5.
NOTE The load line length is defined in the OMI "International Load Lines Convention 1966/2005", it can
be smaller than L for craft with overhangs. This length also sets up at 24 m the lower limit of several IMO
H
conventions.
This document is applicable to multihulls built from the same materials as in ISO 12215-5, in intact
condition, and of the two following types:
— recreational craft, including recreational charter vessels;
— commercial craft and workboats.
It is not applicable to multihull racing craft designed only for professional racing.
This document is applicable to the structures supporting windows, portlights, hatches, deadlights
and doors.
For the complete scantlings of the craft, this document is intended to be used in conjunction with
ISO 12215-8 for rudders, ISO 12215-9 for appendages of sailing craft and ISO 12215-10 for rig loads and
rig attachment in sailing craft. ISO 12215-6 can be used for additional details.
2
Throughout this document, unless otherwise specified, dimensions are in (m), areas in (m ), masses
2 2
in (kg), forces in (N), moments in (Nm), Pressures in (kN/m ) (1 kN/m = 1 kPa), stresses and elastic
2 2
modulus in (N/mm ) (1 N/mm = 1 MPa).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 8666:2020, Small craft — Principal data
ISO 12215-5:2019, Small craft — Hull construction and scantlings — Part 5: Design pressures for monohulls,
design stress, scantlings determination
ISO 12215-8:2009, Small craft — Hull construction and scantlings — Part 8: Rudders
ISO 12215-9:2012, Small craft — Hull construction and scantlings — Part 9: Sailing craft appendages
ISO 12215-10:2020, Small craft — Hull construction and scantlings — Part 10: Rig loads and rig
attachments in sailing craft
© ISO 2020 – All rights reserved 1

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SIST EN ISO 12215-7:2021
ISO 12215-7:2020(E)

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 12217-2:2015, Small craft — Stability and buoyancy assessment and categorization — Part 2: Sailing
boats of hull length greater than or equal to 6 m
ISO 12217-3:2015, Small craft — Stability and buoyancy assessment and categorization — Part 3: Boats of
hull length less than 6 m
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
multihull
craft with two or more hulls with a connecting wet deck (3.8)/crossbeams above the loaded waterline,
as opposed to a tunnel boat or scow
Note 1 to entry: See Clause 6 and Figure 2 for the main dimensions of a multihull.
3.2
design categories
description of the sea and wind conditions for which a craft is assessed to be suitable
Note 1 to entry: The design categories are defined in ISO 12217 (all parts).
Note 2 to entry: The definitions of the design categories are in line with the European Recreational Craft Directive
2013/53/EU.
[SOURCE: ISO 12215-5:2019, 3.1.]
3.3
loaded displacement
m
LDC
mass of water displaced by the craft, including all appendages, when in fully loaded ready for use
condition
Note 1 to entry: The fully loaded ready for use condition is further defined in ISO 8666.
[SOURCE: ISO 12215-5:2019, 3.2.]
3.4
mass in minimum operating conditions
m
OC
mass of the craft in minimum operating condition
Note 1 to entry: The minimum operating condition is further defined in ISO 8666.
3.5
sailing craft
craft for which the primary means of propulsion is wind power
Note 1 to entry: It is further defined in ISO 8666.
Note 2 to entry: In this document, non-sailing craft are considered as motor craft.
2 © ISO 2020 – All rights reserved

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SIST EN ISO 12215-7:2021
ISO 12215-7:2020(E)

[SOURCE: ISO 12215-5:2019, 3.3.]
3.6
beam of hull
B
H
beam across the outer hulls
Note 1 to entry: The measurement of the beam of hulls is specified in ISO 8666.
3.7
chine beam
B
C
beam at chine of planing hulls
Note 1 to entry: It is further characterized in 6.1.2.
3.8
wet deck
underside area of the structure connecting hulls with an area greater than 5 % L B
H H
Note 1 to entry: Some multihulls (3.1) have no wet deck but just crossbeams. i.e. connecting beams.
3.9
craft speed
V
for motor craft, maximum speed in calm water and m condition that is declared by the manufacturer,
LDC
expressed in knots
[SOURCE: ISO 12215-5:2019, 3.6.]
3.10
displacement craft
motor craft whose speed is such that VL<5
WL
[SOURCE: ISO 12215-5:2019, 3.7, modified - the definition is reworded.]
3.11
displacement mode
mode of running of a motor craft in the sea such that its mass is mainly supported by buoyancy forces
Note 1 to entry: This is the case where the actual speed in a seaway in m condition is such that its speed/
LDC
length ratio makes the craft behave as a displacement craft (3.10).
[SOURCE: ISO 12215-5:2019, 3.8, modified - in the definition, "craft" is replaced with "motor craft".]
3.12
planing craft
motor craft whose speed is such that VL≥5
WL
Note 1 to entry: This speed/length ratio limit has been arbitrarily set up in this document, but it can vary from
one craft to another according to hull shape and other parameters.
[SOURCE: ISO 12215-5:2019, 3.9, modified - the definition is reworded.]
3.13
planing mode
mode of running of a motor craft in the sea such that a significa
...