Small craft - Hull construction and scantlings -Part 10: Rig loads and rig attachment in sailing craft
1 Scope
This document specifies methods for the determination of:
- the design loads and design stresses on rig elements; and
- the loads and scantlings of rig attachments and mast steps/pillars;
on monohull and multihulls sailing craft.
It also gives, in Annexes, "established practices "for the assessment of mast steps/pillars or chainplates
Note 1: Other engineering methods can be used provided the design loads and design stresses are used.
This document is applicable to craft with a hull length LH up to 24m but it can also be applied to craft up to 24 m load line length.
Note 2: The load line length is defined in the OMI "International Load Lines Convention 1966/2005", it is smaller than LH. This length also sets up, at 24 m, the lower limit of several IMO conventions.
Scantlings derived from this document are primarily intended to apply to recreational craft, including charter vessels.
This document is not applicable to racing craft designed only for professional racing.
This document only considers the loads exerted when sailing. Any loads that may result from other situations are not considered in this document.
Throughout this document, and unless otherwise specified, dimensions are in (m), areas in (m2), masses in (kg), forces in (N), moments in (N·m), stresses and elastic modulus in N/mm²(1 N/mm2=1 Mpa).
Unless otherwise stated, the craft is assessed in fully loaded ready for use condition.
2 Normative references
The following referenced documents are indispensable for the application 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 12215-5:2019 Smallcraft - Hullconstruction and scantlings - Part 5 : Design pressures for monohulls, design stresses, scantlings determination
Note: GB/T 19314.5-2019 Small craft - Hull construction and scantlings - Part 5 : Design pressures for monohulls, design stresses, scantlings determination (ISO 12215-5: 2008, IDT)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
design categories
description of the sea and wind conditions for which a craft is assessed to be suitable
Note 1: The design categories are defined in ISO 12217 (all parts).
Note 2: 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]
3.2
loaded displacement
mLDC
mass of water displaced by the craft, including all appendages, when in the fully loaded ready-for-use condition
Note: The fully loaded ready-for-use condition is further defined in ISO 8666.
[Source: ISO 12215-5:2019, 3.2]
3.3
sailing craft
craft for which the primary means of propulsion is wind power
Note: It is further defined in ISO 8666.
[Source: ISO 12215-5:2019, 3.3, modified - Note 2 deleted]
3.4
monohull
craft with only one hull
3.5
multihull
craft with two or more hulls with a connecting wet deck/platform or beams above the loaded waterline, as opposed to a tunnel boat or scow
3.6
mast step
element fitted at the bottom of the mast that supports the mast compression and transmits it to the rest of the structure
3.7
mast pillar
pillar
in a deck stepped rig, structural element that transmits the mast compression to the rest of the structure
3.8
chainplate
rig attachment
component(s) to which the rig elements are attached, transmitting their load to the rest of the structure, including tie rods where relevant
Example: Metal chainplate, strapped composite chainplate
Note: See Annex D.
3.9
connection
all elements or group of elements connecting the rig attachment to the structure of the craft
Example: Bolts, lamination.
Note: Some of these elements can be part of the chainplate.
3.10
mLDC condition
maximum load condition corresponding to the loaded displacement (3.2)
4 Symbols
Unless specified otherwise, the symbols, factors and parameters given in Table 1 apply.
