Section
1 General
1.1 Applicability
1.1.1 This Chapter applies to craft that are fitted with a rig used for propulsion by wind
force.
1.1.2 This Chapter applies to the rig insofar as this structure is used for propulsion
purposes. The actual propulsion force may be generated by sails that are hoisted on
the mast (e.g. fore-and-aft rig), rotation of the mast structure itself (e.g.
Flettner rotors), or other means that capture wind force and transfer it to the hull
(e.g. DynaRig).
1.1.3 Other elements of wind propulsion systems such as sails and running rigging are
excluded from this Chapter.
1.1.4 Rigs, from an arrangement point of view, that do not fit into the assessment
structure as laid out in this Chapter, will be considered on an equivalence
basis.
1.1.5 Attention is drawn to the requirements of the Flag Administration regarding the
application of certain materials, systems, criteria or practices.
1.2 Definitions
1.2.1 ‘The rig’ in this Chapter is defined as all the structure and equipment essential for
the safe operation of a wind propulsion system.
1.3 Class notations
1.3.1 RIGGING. The RIGGING notation will be assigned where a new craft is
fitted with a rig used for propulsion by wind force which is in accordance with the
Rules.
1.3.2 RIGGING*. Upon request, the RIGGING* notation will be assigned where an
existing craft is fitted with a rig used for propulsion by wind force where:
- the rig design complies with requirements of this
Chapter;
- maintenance records starting at the time of first stepping
are available and assessed;
- service history is available and assessed; and
- a rig behaviour trial is carried out. See
Pt 3, Ch 7, 6 Rig behaviour trial.
1.4 Submissions requirements
1.4.1 In addition to submissions required by Pt 3, Ch 1, 5 Information required, plans and
information are to be submitted as required in Table 7.1.1 Plans and particulars to be
submitted as applicable.
Table 7.1.1 Plans and particulars to be
submitted
Document
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For information, see Note
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For appraisal, see Note
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Technical Construction File (TCF)
see
Pt 3, Ch 7, 1.5 The Technical Construction File, additionally including:
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X
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Transport and handling
procedures
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Dock tune
procedure
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Maintenance
manual
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Material
certification
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General wind propulsion layout
plan
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X
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Deck hardware plan
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X
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Deck fittings for cleats, sheet
winches, sheet tracks, travellers, etc. and through-deck
fittings
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X
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Mast, spreader and spar
sections
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X
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Limit load and working load on mast
foundation
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X
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Mast loadings
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X
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Bowsprit arrangement with all its
stays and loadings
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X
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Rig loadings
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X
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Mast step
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X
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Mast bearing integration and its
foundation in the case of unstayed wind propulsion systems
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X
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Chainplates, furlers, forestay and
backstay attachments
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X
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Ballast keel securing arrangements
including information of the mass of the keel and ballast and its
centre of gravity, including keel trunk
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X
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Dagger board arrangement
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X
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Rudder skeg construction and support
details
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X
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Note X indicates
reason for submission.
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1.5 The Technical Construction File
1.5.1 A Technical Construction File (TCF) is to be maintained during the design,
construction, stepping and commissioning phases.
1.5.2 The TCF will be the basis for appraisal.
The TCF will include a:
- Global design description which is to include a sail plan(s)
with standing and running rigging shown. The sails that are carried on board and
that can be used in the sailing conditions are to be described.
- Methodology description which gives the methods used for
calculations and predictions, and explains the computational approach applied to
the rig scantling design.
- Load case definition. A list of load cases for which the rig
is designed. As a minimum, the applied load cases will be limit cases. The load
case definition is to include:
- operation at sea;
- manufacture (if considered applicable);
- transport;
- stepping;
- maintenance (if considered applicable); and
- survival.
- Structural design definition, which is a collection of
documents and plans showing dimensions, materials, and cross-sections of all
elements making up the structural integrity of the rig. Limit loads are to be
defined for each of the elements. See also
Pt 3, Ch 7, 2.3 Stress factors (SF).
- Design evaluation report, which is to show that, in any of
the design load cases, the loads on elements do not exceed permissible values.
Rig foundation loads (e.g. mast step, chain plates, winch foundations and strong
points) are part of the hull appraisal but may be taken into consideration in
the design evaluation report.
- Materials certification report, which includes a declaration
from the manufacturer that all construction materials are compliant with the
structural design definition and will be examined using spot checks.
- Rig stepping report, which is to include the transport and
stepping procedure as provided by the manufacturer and is to be to the
satisfaction of the attending Surveyor.
- Rig behaviour report, which is to include a minimum of three
sailing conditions which are included in the rig operation manual. It is a
factual statement of observations made during trials with particular focus on
agreement between predicted condition and actual performance. The report and
observations are to be to the satisfaction of the attending Surveyor.
- Rig maintenance manual which is, as a minimum, to include
maintenance instructions from the manufacturers of parts affecting safety and
durability, clearly scheduled maintenance tasks that can be recorded in the
ship’s logbook and descriptions of the procedures for inspection. Attention is
drawn to the Code of safe working practices for merchant seafarers
(COSWP).
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