EN ISO 12215-8:2009

SLOVENSKI STANDARD
01-julij-2009
Mala plovila - Konstrukcija trupa in zahtevane lastnosti - 8. del: Krmila (ISO 12215-
8:2009)
Small craft - Hull construction and scantlings - Part 8: Rudders (ISO 12215-8:2009)
Kleine Wasserfahrzeuge - Rumpfbauweise und Dimensionierung - Teil 8: Ruder (ISO
12215-8:2009)
Petits navires - Construction de coques et échantillonnage - Partie 8: Gouvernails (ISO
12215-8:2009)
Ta slovenski standard je istoveten z: EN ISO 12215-8:2009
ICS:
47.020.10 Ladijski trupi in njihovi Hulls and their structure
konstrukcijski elementi elements
47.080 ýROQL Small craft
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 12215-8
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2009
ICS 47.020.10; 47.080
English Version
Small craft - Hull construction and scantlings - Part 8: Rudders
(ISO 12215-8:2009)
Petits navires - Construction de coques et échantillonnage - Kleine Wasserfahrzeuge - Rumpfbauweise und
Partie 8: Gouvernails (ISO 12215-8:2009) Dimensionierung - Teil 8: Ruder (ISO 12215-8:2009)
This European Standard was approved by CEN on 21 April 2009.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12215-8:2009: E
worldwide for CEN national Members.

Contents Page
Foreword .3
Annex ZA (informative) Relationship between this International Standard and the Essential
Requirements of EU Directive 94/25/EC amended by EU Directive 2003/44/EC .4

Foreword
This document (EN ISO 12215-8:2009) has been prepared by Technical Committee ISO/TC 188 "Small craft"
in collaboration with CEN Sub-sector T01 “Shipbuilding and maritime structures”, the secretariat of which is
held by CMC.
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 November 2009, and conflicting national standards shall be withdrawn
at the latest by November 2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] 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, and supports essential requirements of EC Directive(s).
For relationship with EC 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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 12215-8:2009 has been approved by CEN as a EN ISO 12215-8:2009 without any
modification.
Annex ZA
(informative)
Relationship between this International Standard and the Essential
Requirements of EU Directive 94/25/EC amended by EU Directive
2003/44/EC
This standard has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association to provide one means of conforming to Essential Requirements of the New
Approach Directive 94/25/EC amended by EU Directive 2003/44/EC.
Once this standard is cited in the Official Journal of the European Communities under that Directive and has
been implemented as a national standard in at least one Member State, 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 International Standard and Directive 94/25/EC amended
by EU Directive 2003/44/EC
Essential requirements (ERs) of EU
Clause(s)/sub-clause(s) of this
Directive 94/25/EC amended by EU Qualifying remarks/Notes
International Standard
Directive 2003/44/EC
The standard provides
All clauses Annex 1 A, Clause 3.1 structure
requirements for the structural
strength of rudders.
Single bearing spade rudders and
single hull bearing skeg rudders are not
addressed by this standard.
WARNING — Other requirements and other EU Directives may be applicable to the products falling
within the scope of this standard.

INTERNATIONAL ISO
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
ISO 12215-8:2009(E)
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ISO 12215-8:2009(E)
Contents Page
Foreword. v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Symbols . 2
5 Design stresses . 4
5.1 Rudder material. 4
6 Rudder and steering arrangement, rudder types . 5
6.1 General. 5
6.2 Rudder types . 6
7 Design rudder force calculation. 10
7.1 General. 10
7.2 Force F and corresponding load case . 11
7.3 Force F 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 . 16
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 Required diameter for solid circular metal rudder stocks . 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. 24
13.3 FRP rudder blades. 24
13.4 Non-FRP rudder blades. 25
14 Skeg structure. 25
14.1 General. 25
14.2 Design stress . 25
Annex A (normative) Metal for rudder stock .
...