Section 1 Hull design and construction parameters
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Special Service Craft, July 2022 - Part 4 Additional Requirements for Yachts - Chapter 3 Special Considerations for Sailing Yachts - Section 1 Hull design and construction parameters

Section 1 Hull design and construction parameters

Parent topic: Chapter 3 Special Considerations for Sailing Yachts

1.1 Plans and data

1.1.1 In addition to the general plans and data required by Pt 3, Ch 1, 5 Information required the following details of additional structural components, particular to sailing yachts, are to be submitted for appraisal:

  • Sail plan, including sail set configurations.
  • Limit load and working load on mast foundation.
  • Mast loadings.
  • Bowsprit arrangement with all its stays and loadings.
  • Rigging loadings.
  • Mast step.
  • Mast partners.
  • Boom and gaff.
  • Mast bearing integration and its foundation in the case of aerorig/dynarig.
  • Ballast keel lines plan.
  • Ballast keel securing arrangements including information of the weight of the keel and ballast and its centre of gravity.
  • Keel trunk in the case of a lifting keel or canting keel.
  • Dagger board arrangement.
  • Rudder skeg construction and support details.
  • Chainplates, Furler, forestay and backstay attachments.
  • Deck hardware plan.
  • Deck fitting for cleats, sheet winches, sheet tracks, travellers etc.
  • Through-deck fittings.
  • Mast and spreader sections.

1.1.2 All plans are to be presented in a clear and unambiguous manner with sufficient details to avoid misinterpretation.

1.2 Mast and rigging support arrangements

1.2.1 Sailing yacht mast and standing rigging loadings and their support structure require special consideration as follows:

  1. Adequate hull and deck longitudinal structure to resist hull bending.

  2. Provision of adequate transverse structure in way of masts, chainplates, keels, skegs etc.

  3. Provision of adequate bottom structure to support the mast and dissipate the mast loadings.

  4. Local reinforcement as given in Pt 8, Ch 3, 3.14 Local reinforcement in way of chainplates, forestay and backstay fittings, etc.

  5. The deck and beams are to be suitably strengthened in way of masts, coachroof/deckhouse ends, windlass, cleats, sheet winches, sheet tracks etc. Where a mast is stepped on the deck or coachroof/deckhouse the structural arrangements will be specially considered.

1.2.2 Details of the designer's/Builder's calculated maximum loads on the mast heel and the breaking loads of all standing rigging are to be submitted with the main structural plans for appraisal.

1.3 Bowsprits

1.3.1 The hull structure in way of the bowsprit is to be suitably reinforced with due account taken of the compressive loads along the bowsprit and bending moments due to rigging loads.

1.3.2 Details of the designer's/Builder's calculated maximum loads on the bowsprit and the breaking loads of all associated standing rigging are to be submitted with the structural plans for appraisal.

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