EN ISO 12217-3:2002

SLOVENSKI STANDARD
01-december-2002
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Small craft - Stability and buoyancy assessment and categorization - Part 3: Boats of hull
length less than 6 m (ISO 12217-3:2002)
Kleine Wasserfahrzeuge - Festlegung und Kategorisierung von Stabilität und Auftrieb -
Teil 3: Boote unter 6 m Rumpflänge (ISO 12217-3:2002)
Petits navires - Evaluation et catégorisation de la stabilité et de la flottabilité - Partie 3:
Bateaux d'une longueur de coque inférieure a 6 m (ISO 12217-3:2002)
Ta slovenski standard je istoveten z: EN ISO 12217-3:2002
ICS:
47.080
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 12217-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2002
ICS 47.080
English version
Small craft - Stability and buoyancy assessment and
categorization - Part 3: Boats of hull length less than 6 m (ISO
12217-3:2002)
Petits navires - Evaluation et catégorisation de la stabilité et Kleine Wasserfahrzeuge - Festlegung und Kategorisierung
de la flottabilité - Partie 3: Bateaux d'une longueur de von Stabilität und Auftrieb - Teil 3: Boote unter 6 m
coque inférieure à 6 m (ISO 12217-3:2002) Rumpflänge (ISO 12217-3:2002)
This European Standard was approved by CEN on 1 May 2002.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2002 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12217-3:2002 E
worldwide for CEN national Members.

CORRECTED  2002-05-15
Foreword
This document (ISO 12217-3:2002) has been prepared by Technical Committee ISO/TC 188
"Small craft", 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 2002, and conflicting
national standards shall be withdrawn at the latest by November 2002.
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 ZB, 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,
Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,
Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the
United Kingdom.
Endorsement notice
The text of the International Standard ISO 12217-3:2002 has been approved by CEN as a
European Standard without any modifications.
NOTE Normative references to International Standards are listed in annex ZA (normative).
Annex ZA
(normative)
Normative references to international publications
with their relevant European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions
of any of these publications apply to this European Standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies (including amendments).
NOTE Where an International Publication has been modified by common modifications,
indicated by (mod.), the relevant EN/HD applies.
Publication Year Title EN Year
ISO 9093-1 1994 Small craft - Seacocks and through- EN ISO 9093-1 1997
hull fittings - Part 1: Metallic
ISO 10240 1995 Small craft - Owner's manual EN ISO 10240 1996
ISO 11812 2001 Small craft - Watertight cockpits and EN ISO 11812 2001
quick-draining cockpits
ISO 12217-1 2002 Small craft - Stability and buoyancy EN ISO 12217-1 2002
assessment and categorization -
Part 1: Non-sailing boats of hull
length greater than or equal to 6 m
ISO 12217-2 2002 Small craft - Stability and buoyancy EN ISO 12217-2 2002
assessment and categorization -
Part 2: Sailing boats of hull length
greater than or equal to 6 m
ISO 14946 2001 Small craft - Maximum load capacity EN ISO 14946 2001
Annex ZB
(informative)
Clauses of this European Standard addressing essential requirements
or other provisions of EU Directives
This European Standard 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 94/25/EC.
WARNING: Other requirements and other EU Directive may be applicable to the
product(s) falling within the scope of this standard.
The following clauses of this standard, as detailed in Table ZA.1, are likely to support
requirements of Directive 94/25/EC.
Compliance with the clauses of this standard provides one means of conforming with the
specific essential requirements of the Directive concerned and associated EFTA regulations.
Table ZA.1 - Correspondence between this European Standard and EU Directives
Clauses/sub-clauses of Corresponding annexes/ Comments
this European Standard paragraphs of Directive
94/25/EC
5, 6, 7, 8, Annex A, B, C, D Annex 1, Clause 3.2, Stability Design categories A, B, C
and Freeboard, Clause 3.5, and D defined in the standard
Flooding, and Clauses 3.6 are considered to correspond
and 3.2, maximum load and to design categories A, B, C
number of persons and D of the Directive.
6.4, 6.5, 7.3, Annex B, C, D Annex I, Clause 3.3,
Buoyancy and flotation.
Annex E Annexe I, Clause 2.5,
Owner's manual
INTERNATIONAL ISO
STANDARD 12217-3
First edition
2002-05-01
Small craft — Stability and buoyancy
assessment and categorization —
Part 3:
Boats of hull length less than 6 m
Petits navires — Évaluation de la stabilité et de la flottabilité et
catégorisation —
Partie 3: Bateaux d'une longueur de coque inférieure à 6 m

Reference number
ISO 12217-3:2002(E)
©
ISO 2002
ISO 12217-3:2002(E)
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ii © ISO 2002 – All rights reserved

ISO 12217-3:2002(E)
Contents Page
1 Scope .1
2 Normative references.1
3 Terms and definitions .2
3.1 Primary.2
3.2 Downflooding.3
3.3 Condition and mass .3
3.4 Other definitions .4
4 Symbols.6
5 Procedure .6
5.1 Maximum total load .6
5.2 Sailing or non-sailing .6
5.3 Tests to be applied .7
5.4 Alternatives .7
6 Tests to be applied to non-sailing boats.7
6.1 General.7
6.2 Downflooding-height tests .8
6.3 Offset-load test .12
6.4 Level flotation test.13
6.5 Basic flotation test.14
6.6 Capsize-recovery test.14
7 Tests to be applied to sailing boats.15
7.1 General.15
7.2 Downflooding-height tests .16
7.3 Flotation tests .16
7.4 Capsize-recovery test.16
7.5 Knockdown-recovery test.17
7.6 Wind stiffness test.18
8 Application .19
8.1 Deciding the design category .19
8.2 Meaning of the design categories.19
Annex A (normative) Full method for required downflooding height .20
Annex B (normative) Method for flotation tests.22
Annex C (normative) Flotation material and elements.27
Annex D (normative) Calculation method for basic flotation requirement .29
Annex E (normative) Information for owner's manual .31
Annex F (informative) Summary of requirements.32
Annex G (informative) Worksheets .34
Bibliography.47

ISO 12217-3:2002(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
The main task of technical committees is to prepare International Standards. Draft International Standards adopted
by the technical committees are circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this part of ISO 12217 may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 12217-3 was prepared by Technical Committee ISO/TC 188, Small craft.
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
Annexes A, B, C, D and E form a normative part of this part of ISO 12217. Annexes F and G are for information
only.
iv © ISO 2002 – All rights reserved

ISO 12217-3:2002(E)
Introduction
This part of ISO 12217 enables the determination of the limiting environmental conditions to be determined for
which an individual boat has been designed.

INTERNATIONAL STANDARD ISO 12217-3:2002(E)

Small craft — Stability and buoyancy assessment and
categorization —
Part 3:
Boats of hull length less than 6 m
CAUTION — Compliance with this part of ISO 12217 does not guarantee total safety or total freedom of
risk from capsize or sinking.
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 craft vulnerable 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 (C or D) appropriate to its design and maximum load.
This part of ISO 12217 is applicable to boats of hull length less than 6 m, whether propelled by human or
mechanical power, except habitable sailing multihulls. Boats of hull length less than 6 m, which are fitted with a full
deck and quick-draining cockpit(s) complying with ISO 11812, may alternatively be assessed using ISO 12217-1 or
ISO 12217-2 (for non-sailing and sailing boats respectively), in which case higher design categories may be
assigned.
This part of ISO 12217 excludes
 aquatic toys,
 canoes, kayaks or other boats with a beam of less than 1,1 m,
 inflatable and rigid-inflatable boats up to 8 m covered by ISO 6185,
 personal watercraft covered by ISO 13590,
 hydrofoils and hovercraft when operating in the dynamically supported mode, and
 submersibles.
It does not include or evaluate the effects on stability of towing, fishing, dredging or lifting operations, which should
be separately considered if appropriate.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 12217. For dated references, subsequent amendments to, or revisions of, any of these publications
do not apply. However, parties to agreements based on this part of ISO 12217 are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain
registers of currently valid International Standards.
ISO 12217-3:2002(E)
ISO 2896:2001, Rigid cellular plastics — Determination of water absorption
1)
ISO 8666:— , Small craft — Principal data
ISO 9093-1:1994, Small craft — Seacocks and through-hull fittings — Part 1: Metallic
1)
ISO 9093-2:— , Small craft — Seacocks and through-hull fittings — Part 2: Non-metallic
1)
ISO 9094-1:— , Small craft — Fire protection — Part 1: Craft with a hull length of up to and including 15 m
1)
ISO 9094-2:— , Small craft — Fire protection — Part 2: Craft with a hull length of over 15 m
2)
ISO 10240:1995 , Small craft — Owner’s manual
ISO 11812:2001, Small craft — Watertight cockpits and quick-draining cockpits
1)
ISO 12216:— , Small craft — Windows, portlights, hatches, deadlights and doors — Strength and tightness
requirements
ISO 12217-1:2002, Small craft — Stability and buoyancy assessment and categorization — Part 1: Non-sailing
boats of hull length greater than or equal to 6 m
ISO 12217-2:2002, Small craft — Stability and buoyancy assessment and categorization — Part 2: Sailing boats of
hull length greater than or equal to 6 m
ISO 14946:2001, Small craft — Maximum load capacity
IMO Resolution MSC.81(70) — Revised Recommendation on Testing of Life-Saving Appliances
3 Terms and definitions
For the purposes of this part of ISO 12217, the following terms and definitions apply.
The mainings 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 by this part of ISO 12217
NOTE See also 8.2.
3.1.2
recess
any volume open to the sky that may retain water
EXAMPLE Cockpits, wells, open volumes or areas bounded by bulwarks or coamings
NOTE Cabins, shelters or lockers provided with closures according to the requirements of ISO 12216 are not recesses.

1) To be published.
2) Undergoing revision.
2 © ISO 2002 – All rights reserved

ISO 12217-3:2002(E)
3.1.3
quick-draining recess
recess fulfilling all the requirements of ISO 11812 for “quick-draining cockpits and recesses”
NOTE 1 ISO 11812 contains requirements with which most sailing dinghies cannot comply.
NOTE 2 According to its characteristics, a cockpit may be considered to be quick-draining for one design category, but maybe
not for a higher one.
3.1.4
watertight recess
recess fulfilling all the requirements of ISO 11812 for “watertight cockpits and recesses”
NOTE This term only implies requirements in respect of watertightness and sill heights, but not those for drainage.
3.1.5
fully decked boat
boat in which the horizontal projection of the sheerline area comprises any combination of
 watertight deck and superstructure, and/or
 quick-draining recesses complying with ISO 11812, and/or
 watertight recesses complying with ISO 11812 with a combined volume of less than L B F /40,
H H M
all closing appliances being watertight in accordance with ISO 12216
3.1.6
partially decked boat
boat in which at least two-thirds of the horizontal projection of the sheerline area is equipped with decking, cabins,
shelters or rigid covers which are watertight according to ISO 12216 and designed to shed water overboard, in
which area all that within L /3 from the bow and also the area 100 mm inboard from the periphery of the boat are
H
included
NOTE Outboard engine wells are considered to provide a covering suitable for this purpose.
3.2 Downflooding
3.2.1
downflooding opening
any opening (including the edge of a recess) that may admit water into the interior or bilge of a boat, or a recess,
apart from those excluded in 6.2.1.1
3.2.2
downflooding height
h
D
smallest height above the waterline to any downflooding opening, apart from those excluded in 6.2.1.1, when the
boat is upright in calm water at loaded displacement mass and design trim
NOTE Downflooding height is expressed in metres.
3.3 Condition and mass
3.3.1
light craft condition
boat equipped as the light craft mass according to ISO 8666 with the following added and positioned as
appropriate:
a) where provision is made for propulsion by outboard engine(s) of more than 3 kW, the heaviest engine(s)
recommended for the boat by the manufacturer, mounted in the working position(s);
ISO 12217-3:2002(E)
b) where batteries are fitted, they shall be mounted in the position intended by the builder;
c) mast(s), boom(s), and other spar(s) on board and rigged in the stowed position ready for use, but not set; all
standing and running rigging in place;
d) any sails supplied by the builder, onboard and rigged ready for use, but not hoisted, e.g. mainsail on boom,
roller furling sails furled, hanked foresails on stay stowed on foredeck
NOTE In item b), the mass allowed for outboard engine batteries shall not be less than that given in column 3 of
Tables B.2 and B.3. If there is no specific stowage provided for batteries, the mass of one battery for each engine over 7 kW
shall be allowed for, and located within 1,0 m of the engine location.
3.3.2
maximum total load
m
MTL
maximum load which the boat is designed to carry in addition to the light craft condition, comprising the
manufacturer’s maximum recommended load as defined in ISO 14946, including all liquids (e.g. fuel, oils, fresh
water, water in ballast or bait tanks and live wells) to the maximum capacity of fixed or portable tanks
NOTE Maximum total load is expressed in kilograms.
3.3.3
loaded displacement mass
m
LDC
mass of the boat in light craft condition with maximum total load added
NOTE Loaded displacement mass is expressed in kilograms.
3.4 Other definitions
3.4.1
crew
collective description of all persons on board a boat
3.4.2
crew limit
CL
maximum number of people (with a mass of 75 kg each) used when assessing the design category
3.4.3
design trim
longitudinal attitude of a boat when upright, with crew, stores and equipment in the positions designated by the
designer or builder
NOTE Crew are assumed to be in positions designated by the builder. In the absence of builder’s instructions, crew and
gear are assumed to be positioned in a manner most likely to provide a favourable test result, provided that such positions are
consistent with the proper operation of the boat and that crew are assumed to be either standing at designated positions fitted
with hand holds, or seated.
3.4.4
flotation element
element which provides “buoyancy” to the boat and thus influences the flotation characteristics
3.4.4.1
air tank
tank made of hull construction material, integral with hull or deck structure
3.4.4.2
air container
container made of stiff material, not integral with the hull or deck structure
4 © ISO 2002 – All rights reserved

ISO 12217-3:2002(E)
3.4.4.3
low density material
material with a specific gravity of less than 1,0 primarily incorporated into the boat to enhance the buoyancy when
swamped
3.4.4.4
rib collar
heavy duty tubular collar fitted around the periphery of the boat and always intended to be inflated whenever the
boat is being used
3.4.4.5
inflated bag
bag made of flexible material, not integral with hull or deck, accessible for visual inspection and intended always to
be inflated when the boat is being used
NOTE Bags intended to be inflated automatically when immersed (e.g. at the masthead as a means to prevent inversion)
are not regarded as flotation elements.
3.4.5
loaded waterline
waterline of the boat when upright at loaded displacement mass and design trim
3.4.6
watertightness degree
degree of watertightness as specified in ISO 11812 and ISO 12216
NOTE The degree of watertightness is summarized as follows.
Degree 1: Degree of tightness providing protection against effects of continuous immersion in water.
Degree 2: Degree of tightness providing protection against effects of temporary immersion in water.
Degree 3: Degree of tightness providing protection against splashing water.
Degree 4: Degree of tightness providing protection against water drops falling at an angle of up to 15° from the vertical.
ISO 12217-3:2002(E)
4 Symbols
For the purposes of this part of ISO 12217, the symbols in Table 1 apply.
Table 1 — Symbols
Symbol Units Meaning
A m Nominal sail area according to ISO 8666
S
B m Beam of hull according to ISO 8666
H
B m Beam waterline according to ISO 8666 on the loaded waterline. In the case of multihulls, this is the
WL
sum of the maximum waterline beam of each of the hulls
CL — Crew limit according to 3.4.2
F m Freeboard midships according to ISO 8666 to the loaded waterline
M
h m Actual downflooding height according to 6.2
D
h m Required downflooding height according to 6.2
D(R)
L m Length of hull according to ISO 8666
H
m kg Mass of the boat in light craft condition, see 3.3.1
LCC
m kg Mass of the boat in light craft condition with maximum total load added, see 3.3.3
LDC
m kg Mass of the maximum total load, see 3.3.2
MTL
5 Procedure
5.1 Maximum total load
Decide on the crew limit and the maximum total load that the boat is intended to carry in accordance with the
definitions. The crew limit shall not exceed that determined by the seating or standing space requirements of
ISO 14946.
NOTE If a boat is assessed with different amounts of maximum total load, different design categories may be assigned
according to the load.
It is important to ensure that the maximum total load is not underestimated.
5.2 Sailing or non-sailing
Determine whether the boat is sailing or non-sailing. Non-sailing boats are those where
2/3
A < 0,07 x (m )
S LDC
where
A is the nominal sail area according to ISO 8666, expressed in square metres;
S
m is the loaded displacement mass of the boat, expressed in kilograms.
LDC
All other boats are sailing boats. Table 2 gives values of nominal sail area for different loaded displacement
masses.
Table 2 — Minimum nominal sail area for sailing boats
m (kg)
200 300 400 500 600 700 800 900 1000 1100 1200 1500
LDC
A (m ) shall be W 2,4 3,1 3,8 4,4 5,0 5,5 6,0 6,5 7,0 7,5 7,9 9,2
S
6 © ISO 2002 – All rights reserved

ISO 12217-3:2002(E)
5.3 Tests to be applied
Non-sailing boats shall be assessed using clause 6.
Sailing boats other than habitable multihulls shall be assessed using clause 7. Habitable multihull sailing boats
shall be assessed using ISO 12217-2.
If a sailing boat can also be used as a non-sailing boat, e.g. for rowing or for engine propulsion, it shall also meet
the requirements for non-sailing boats. The design category finally given is that for which the boat satisfies all the
relevant requirements.
5.4 Alternatives
If the boat does not reach the desired design category, modify the maximum load and/or the number of crew and
repeat the assessment.
Boats which are fully decked may alternatively be assessed using ISO 12217-1 or ISO 12217-2, for non-sailing and
sailing boats respectively, in which case they may be able to attain design categories A or B.
6 Tests to be applied to non-sailing boats
6.1 General
Non-sailing boats may be assessed by any one of six options according to length of hull, amount of flotation and
decking, and whether the boat is fitted with suitable recesses complying with ISO 11812. These options and the
corresponding tests to be applied are given in Table 3.
The design category finally given in respect of stability and buoyancy is that for which the boat satisfies all the
relevant requirements.
ISO 12217-3:2002(E)
Table 3 — Tests to be applied to non-sailing boats
a a a
Option 1 2 3 4 5 6
Applicable to length of hull Up to 6,0 m From 4,8 m up to 6,0 m
Design categories possible C and D C and D D C and D D only C and D
Applicable to engine powers of Any Any u 3 kW Any Any Any
amount amount amount amount amount
Applicable to the following types Any Any Any Any Any Inboard
of engine installation engines
only
Decking or covering Any Fully Any Partially Any Any
b c
amount amount amount amount
decked decked
d
Downflooding-height test 6.2 6.2 6.2 6.2 6.2
6.2
Offset-load test 6.3 6.3 — 6.3 6.3 6.3
Flotation standard Level — See 6.6 — — Basic
Flotation test 6.4 — See 6.6 — — 6.5
Flotation elements Annex C — Annex C — — Annex C
Capsize-recovery test — — 6.6 — — —
a
Boats using options 1, 3 and 6 are considered to be susceptible to swamping when used in their design category.
b
This term is defined in 3.1.5.
c
This term is defined in 3.1.6.
d
This test is not required to be applied if, when swamped during the test described in 6.4, the boat supports an equivalent dry mass of
133 % of the maximum total load, or if the boat does not take on water when heeled to 90° from the upright in light craft condition.

6.2 Downflooding-height tests
6.2.1 Downflooding openings
6.2.1.1 The requirements given below, and in 6.2.2 and 6.2.3, shall apply to all downflooding openings except:
a) watertight recesses with a combined volume less than (L B F )/40, or quick-draining recesses;
H H M
b) piped drains from quick-draining recesses or from watertight recesses which, if filled, would not lead to
downflooding or capsize when the boat is upright;
c) non-opening appliances;
d) opening appliances located in the topsides which comply with ISO 12216 to tightness degree 2 and which are
referenced in the Owner’s Manual and are clearly marked “WATERTIGHT CLOSURE – KEEP SHUT WHEN
UNDERWAY”; and which are
1) emergency escape hatches or appliances fitted with screwed closures, or
2) in a compartment of such restricted volume that, even if flooded, the boat satisfies all the requirements, or
3) in a boat of design category C or D and which, when at loaded displacement mass, would not sink if the
affected compartment was flooded as a result of the appliance being left open.
8 © ISO 2002 – All rights reserved

ISO 12217-3:2002(E)
e) opening appliances located inboard of the topsides which comply with ISO 12216 to tightness degree 2 and
which are referenced in the Owner’s Manual and are clearly marked “WATERTIGHT CLOSURE — KEEP
SHUT WHEN UNDERWAY”;
f) engine exhausts or other openings that are only connected to watertight systems;
g) openings in the sides of outboard engine wells which are of
1) watertightness degree 2 and having the lowest point of downflooding more than 0,1 m above the loaded
waterline, or
2) watertightness degree 3 and having the lowest point of downflooding more than 0,2 m above the loaded
waterline and also above the top of the transom in way of the engine mounting, provided that well drain
holes are fitted, see Figure 1, or
3) watertightness degree 4 and having the lowest point of downflooding more than 0,2 m above the loaded
waterline and also above the top of the transom in way of the engine mounting, provided that well drain
holes are fitted, and that the part of the interior or non-quick-draining spaces into which water may be
admitted has a length less than L /6 and from which water up to 0,2 m above the loaded waterline cannot
H
drain into other parts of the interior or non-quick-draining spaces of the boat, see Figure 1.
Dimensions in metres
Key
1 Waterline
2 Watertightness degree 3 or 4
3 Drain
4 Watertightness degree 4
5 Non-quick-draining space
Figure 1 — Openings in outboard engine wells
6.2.1.2 All closing appliances fitted to downflooding openings shall comply with ISO 12216, according to
design category and appliance location area.
6.2.1.3 No opening type appliances shall be fitted in the hull less than 0,2 m above the loaded waterline
unless they comply with ISO 9093 or they are emergency escape hatches complying with ISO 9094.
6.2.1.4 Openings within the boat, such as outboard engine trunks or free-flooding fish bait tanks, shall be
considered as possible downflooding openings.
ISO 12217-3:2002(E)
6.2.2 With maximum load
6.2.2.1 Test
This test is to demonstrate sufficient margins of freeboard for the boat at loaded displacement mass before water is
shipped aboard.
This test is not required for boats assessed using option 1 if, during the buoyancy test in B.4.3, the boat has been
shown to support an equivalent dry mass of 133 % of the maximum total load, or if the boat does not take on water
when heeled to 90° from the upright in the light craft condition.
This test shall be performed using people as described below, using test weights to represent people (at 75 kg per
person), or by calculation (using a lines plan and displacement derived by a weighing or measured freeboards).
a) Select a number of people equal to the crew limit, having an average mass of not less than 75 kg.
b) In calm water, load the boat with all items of maximum total load, with the people positioned so as to achieve
the design trim.
c) Measure the height from the waterline to the points at which water could first begin to enter any downflooding
opening described in 6.2.1.1. Where a downflooding opening is fully protected by a higher coaming around the
recess from which it leads, the downflooding height shall be measured to the lowest point of that coaming.
6.2.2.2 Requirements
a) Determine the design category by comparing the measurements with the requirements for minimum
downflooding height, as modified by b) to f) below, using either
1) the method of normative annex A, which generally gives the lowest requirement, or
2) Figure 2 which is based only on boat length.
b) For boats assessed using options 1, 3, 5 or 6, the required downflooding height within L /3 of the bow shall be
H
increased as shown in Figure 3.
c) Boats assessed using options 1 or 3 are permitted a 20 % reduction in required downflooding height in the way
of an outboard engine mounting position, provided that the width of this reduction is minimized.
d) The required downflooding height at the transom shall be reduced by 0,05 m for boats of design category C
using option 1, provided that such boats have a watertight recess aft (i.e.: cockpit).
e) Boats assessed using Figure 2 shall be permitted downflooding openings having a combined clear area,
2 2
expressed in square millimetres (mm ), of not more than (50L ) within the aft quarter of L provided that the
H H
downflooding height to these openings is not less than 3/4 of that required by Figure 2.
f) For sailing boats also equipped for use as non-sailing boats, the required downflooding height for centreboard,
drop keel or dagger-board casings shall be half that determined by a) above.
10 © ISO 2002 – All rights reserved

ISO 12217-3:2002(E)
a
See Table 3.
b) Design category D
a) Design category C
Figure 2 — Required downflooding height — Design categories C and D

Key
1 Waterline
2 Basic downflooding requirement
3 Increased requirement forward
Figure 3 — Increase in required downflooding height — Options 1, 3, 5 and 6 (see Table 3)
6.2.3 Outboard boats when starting
In addition and only applicable to boats with provision for externally mounted outboard engine(s), the following
requirements shall be satisfied.
 When the boat is in the light craft condition, with engine(s) fitted and one person of not less than 75 kg
positioned 0,5 m forward of the engine attachment point, the least height from the waterline to the point at
which the boat could first begin to enter any downflooding opening shall be greater than 0,1 m.
 The mass of petrol engines shall be taken from columns 1 and 3 of Tables B.1 and B.2 as appropriate to the
maximum power recommended for the boat by the builder. For other engines, the mass of the actual engine
shall be used.
ISO 12217-3:2002(E)
6.3 Offset-load test
6.3.1 General
This test is to demonstrate sufficient stability against offset loading by the crew, for unswamped boats. If it is more
convenient, people may be used instead of test weights provided that the mass of each person used equals or
exceeds that of the relevant test weight. Calculation using a weighed weight for the boat may be used instead of a
practical test.
6.3.2 Test
6.3.2.1 Prepare test weights to represent each person up to the crew limit. A mass of 75 kg shall represent
each person, except for boats of L less than 4,8 m in design category D, when a mass of 75 x L /4,8 shall be
H H
used.
NOTE The use of water containers instead of metallic test weights will give a less advantageous result.
6.3.2.2 Load the boat with all items of maximum total load except the crew.
6.3.2.3 In placing test weights using the following procedure, weights shall be placed on all appropriate seats
and thwarts before being positioned on the bottom boards. Weights shall not be placed in locations where people
cannot stand or sit. In cases of doubt, weights shall be positioned to produce the most adverse result.
6.3.2.4 In calm water, add test weights to represent the longitudinal and vertical position that is appropriate to
one person operating the boat, and giving a trim as near as practical to that intended by the builder. The centre of
gravity of the test weights shall be positioned as far to one side as practicable, provided that it is not closer than
250 mm to the outboard edge of the seating or standing area.
6.3.2.5 Measure the least height from the waterline to the point at which water could first begin to enter the
interior of the boat. For this purpose, one booted outboard-engine well penetration may be excluded. Repeat in the
opposite direction of heel. The lesser of the two measurements made is the measured freeboard margin. On boats
with watertight or quick-draining cockpits, water may enter the cockpit through drains when the boat is heeled
during the test, provided this water drains overboard when the boat returns to the upright. The height shall then be
measured to the point at which water could first begin to enter the bilge.
6.3.2.6 Remove the test weights previously added, and place test weights to represent the longitudinal and
vertical positions that are appropriate to two persons operating the boat, and giving a trim as near as practical to
that intended by the builder. The centre of gravity of the test weights shall be positioned as far to one side as
practicable, provided that the weights representing each crew member are not placed with their centres of gravity
closer than 500 mm apart in any direction, or closer than 250 mm from the outboard edge of seating or standing
areas.
6.3.2.7 Measure the least height from the waterline to the point at which water could first begin to enter the
interior of the boat. For this purpose, one booted outboard engine well penetration may be excluded. Repeat in the
opposite direction of heel. The lesser of the two measurements made is the measured freeboard margin. On boats
with watertight or quick-draining cockpits, water may enter the cockpit through drains when the boat is heeled
during the test, provided this water drains overboard when the boat returns to the upright. The height shall then be
measured to the point at which water could first begin to enter the bilge.
6.3.2.8 Repeat 6.3.2.6 and 6.3.2.7 for further increments of one person at a time until the crew limit is reached,
ensuring that weights are placed on all appropriate seats and thwarts before being positioned on the bottom
boards. In cases of doubt, weights shall be positioned to produce the most adverse result. When placed on curved
bottom boards, the centre of gravity of weights representing a person shall not be further outboard than a 15°
tangent to a level waterline, see Figure 4.
12 © ISO 2002 – All rights reserved

ISO 12217-3:2002(E)
Dimensions in millimetres
Key
1 Centreline of boat
2 Test weight
Figure 4 — Placement of test weights on bottom boards
6.3.2.9 The test shall be stopped before water comes aboard or the boat capsizes.
6.3.2.10 The least of the measurements made according to 6.3.2.5, 6.3.2.7 or 6.3.2.8 is the minimum measured
freeboard margin, which shall exceed the requirement for the appropriate option as given in Table 4.
Table 4 — Required minimum freeboard margin
Dimensions in millimetres
Option 1 2 3 4 5 6
Design category C 100 100 100 150 Not applicable 100
Design category D 10 10 10 10 250
...