ISO 12215-9:2012 pdf download.Small craft-Hull construction and scantlings — Part 9: Sailing craft appendages.
— Keel-to-hull connection (bolts, wedge connection, stub keel, etc.)— see Figures 1, C.3, C.4 and D.1.
Bottom shell plating in respect of the keel bolts and transition arrangements beyond the keel bolt zone into the hull structure: in the case of bolted keels on a hull bottom of sandwich construction, the general practice outlined in Annex D is to have a single skin construction for keel and bolts. If this is not the case. the structural arrangement shall ensure that all loads — keel compression loads, bolt preload, etc. — are safely transferred, using proper core material, inserts, etc. The risk of water permeating the sandwich core via the bolt holes shall be seriously considered,
— Backing plates/washers, where relevant.
Floors, girders and associated supporting structure.
Keel boxes.
Fins, foils, centreboards, dagger boards.
Wherever possible, assessment should be conducted by numerical methods in accordance with Clause 8.
Alternatively the established practice” methods given Clause 9 shall be used.
Where calculation procedures do not exist, assessment should be conducted by a combination of
semi-empirical methods and the established practice given in Clause 9.
7 Load cases
7.1 General
7.1.1 Status of design load cases
CAUTION — For load cases I and 2 (see references in the list below ) — where keels have a large rake angle, the centre of gravity (CG) of the bulblfin can be located a significant distance aft or forward of the fin or bolt group longitudinal centre at the root. This will induce a torsional moment in addition to bending about the fore and aft axis, equal to the weight of the fin!bulb multiplied by the horizontal distance between the fin/bulb longitudinal centre of gravity (LCG) and rootlbolt group LCG. In such cases, it will be necessary to combine direct stresses owing to bending with shear stresses due to the torque. The resulting von Mises equivalent stress shall not exceed the design stress given in Equation (1). See also 7.8.1.
Bottom shell plating in respect of the keel bolts and transition arrangements beyond the keel bolt zone into the hull structure: in the case of bolted keels on a hull bottom of sandwich construction, the general practice outlined in Annex D is to have a single skin construction for keel and bolts. If this is not the case. the structural arrangement shall ensure that all loads — keel compression loads, bolt preload, etc. — are safely transferred, using proper core material, inserts, etc. The risk of water permeating the sandwich core via the bolt holes shall be seriously considered,
— Backing plates/washers, where relevant.
Floors, girders and associated supporting structure.
Keel boxes.
Fins, foils, centreboards, dagger boards.
Wherever possible, assessment should be conducted by numerical methods in accordance with Clause 8.
Alternatively the established practice” methods given Clause 9 shall be used.
Where calculation procedures do not exist, assessment should be conducted by a combination of
semi-empirical methods and the established practice given in Clause 9.
7 Load cases
7.1 General
7.1.1 Status of design load cases
CAUTION — For load cases I and 2 (see references in the list below ) — where keels have a large rake angle, the centre of gravity (CG) of the bulblfin can be located a significant distance aft or forward of the fin or bolt group longitudinal centre at the root. This will induce a torsional moment in addition to bending about the fore and aft axis, equal to the weight of the fin!bulb multiplied by the horizontal distance between the fin/bulb longitudinal centre of gravity (LCG) and rootlbolt group LCG. In such cases, it will be necessary to combine direct stresses owing to bending with shear stresses due to the torque. The resulting von Mises equivalent stress shall not exceed the design stress given in Equation (1). See also 7.8.1.
