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Report YA Special Regulations Review of Multihull Design YA Special Regulations Review of Multihull Design, Construction and Flotation Requirements For Yachting Australia Naval Architecture and Marine Solutions Unit 4, 14 Merino Entrance Cockburn Central WA 6164 PO Box 75 Parkwood WA 6147 Ph (08)9417 9421 [email protected] www.nmsolutions.com.au Report Multihull Design, Construction and Flotation DOCUMENT CHANGE CONTROL Document No. Title 15069-9-27 Review of Multihull Design, Construction and Flotation Requirements Revision By Date Description of change Checked 1 S.R. 03.11.15 Draft Issue S.B. _______________________ Shaun Ritson Naval Architect Naval Architecture and Marine Solutions Unit 4, 14 Merino Entrance Cockburn Central WA 6164 PO Box 75 Parkwood WA 6147 Ph (08)9417 9421 [email protected] www.nmsolutions.com.au Naval Architecture Solutions Pty Ltd ATF N & M Solutions Trading Trust T/A Naval Architecture and Marine Solutions ABN: 43 954 607 498 © 2015 Naval Architecture and Marine Solutions 2 Multihull Design, Construction and Flotation TABLE OF CONTENTS DOCUMENT CHANGE CONTROL ........................................................................................................... 2 1 INTRODUCTION ............................................................................................................................ 4 2 YA SPECIAL REGULATIONS 2013-16............................................................................................ 5 2.1 DESIGN AND CONSTRUCTION ............................................................................................................. 5 2.2 STABILITY AND FLOTATION ............................................................................................................... 5 3 EXISTING REQUIREMENTS OF ORGANISING AUTHORITIES ...................................................... 6 3.1 2013 BALI RACE AND RALLY ............................................................................................................. 6 3.2 2015 BALI RACE AND RALLY ............................................................................................................. 6 3.3 2016 PITTWATER TO COFFS RACE ...................................................................................................... 6 3.4 RORC RACES ............................................................................................................................... 7 4 STANDARDS APPLICABLE TO MULTIHULLS AND CURRENT PRACTICE ...................................... 8 4.1 ISO 12215-7.............................................................................................................................. 8 4.2 DNV-GL RULES ............................................................................................................................ 9 4.3 ISO 12217-1:2013 ..................................................................................................................... 9 4.4 CURRENT PRACTICE ........................................................................................................................ 9 5 FINDINGS AND RECOMMENDATIONS ........................................................................................ 10 5.1 FINDINGS .................................................................................................................................. 10 5.2 RECOMMENDATIONS ..................................................................................................................... 11 APPENDIX A – ISAF OFFSHORE SPECIAL REGULATIONS ................................................................. 13 APPENDIX B –PITTWATER TO COFFS MULTIHULL REQUIREMENTS ................................................ 15 APPENDIX C –YA SR STABILITY AND FLOTATION - MULTIHULLS ................................................... 16 APPENDIX D –OSR STABILITY AND FLOTATION - MULTIHULLS ...................................................... 17 APPENDIX E –ISO 12217 FLOTATION REQUIREMENTS - MONOHULLS ........................................... 18 APPENDIX F –ISO 12217 BUOYANCY REQUIREMENTS - MULTIHULLS ........................................... 19 APPENDIX G –ISO 12217 APPLICATION TO MULTIHULLS ............................................................... 20 © 2015 Naval Architecture and Marine Solutions 3 Multihull Design, Construction and Flotation 1 Introduction A review of the design, construction and flotation requirements of the YA Special Regulations 2013-16 (Special Regulations) has been completed in relation to their application to multihulls competing in Category 1 (Cat 1) and Category 2 (Cat 2)races. This review has considered what standards or regulations are currently applicable to multihulls competing in Cat 1 and Cat 2 races, what standards and regulations are being applied by event organisers, and what regulations and International standards are available that could be applied. © 2015 Naval Architecture and Marine Solutions 4 Multihull Design, Construction and Flotation 2 YA Special Regulations 2013-16 2.1 Design and construction The current version of Special Regulations treats design and construction of monohulls and multihulls very differently. Considering only those vessels with an Age or Series Date on or after 1 July 2010, a monohull competing in a Cat 1 or Cat 2 race is required to; • Be designed and built in accordance with the requirements of ISO 12215 Category A. • Have on board a certificate of building plan review from a notified body recognised by ISAF. • Have on board a declaration signed and dated by the builder to confirm the yacht is built in accordance with the plans reviewed by the notified body. A multihull competing in the same Cat 1 or Cat 2 race is not required, by Special regulations, to satisfy any minimum structural requirements. 2.2 Stability and Flotation Similarly, Special Regulations treat stability and flotation of monohulls and multihulls very differently. Again, considering only those vessels with an Age or Series Date on or after 1 July 2010, a monohull competing in a Cat 1 or Cat 2 race is required to; • Satisfy minimum stability requirements determined in accordance with ORCi or ISO 12217-2 Design Category A. • Have ballast and be resistant to capsize. A multihull competing in the same Cat 1 or Cat 2 race is not required, by Special regulations, to satisfy any minimum stability requirements. Conversely, Special Regulations require a multihull competing in a Cat 1 or Cat 2 race is required to; • Have adequate watertight bulkheads, compartments and flotation to be effectively unsinkable. • Have a minimum of bulkheads for hulls without accommodation • Have a collision bulkhead A monohull competing in the same Cat 1 or Cat 2 race is not required, by Special regulations, to satisfy any requirements in terms of watertight bulkheads or residual flotation. This same anomaly appears in ISO 12217- 2, in that minimum floatation requirements are applicable to Category A multihulls, but not Category A monohulls. © 2015 Naval Architecture and Marine Solutions 5 Multihull Design, Construction and Flotation 3 Existing requirements of Organising Authorities 3.1 2013 Bali Race and Rally Five catamarans competed in the rally division of the 2013 Bali Race and Rally. Within the notice of Race for the event, the Prescriptions and Special Regulations of Yachting Australia were referenced as a governing document. In addition, Appendix A of the NOR set out specific stability requirements applicable to multihulls. • Other than in the case of a boat that submits a current, valid ORCi Certificate, the Organizing Authority may elect to obtain technical advice as to a boat’s eligibility and the data and documentation supplied, at the cost of the entrant concerned. The entrant will be consulted prior to this occurring. The organisers did not report any structure or stability related incidents with the multihull competitors. 3.2 2015 Bali Race and Rally One catamaran competed in the rally division of the 2015 Bali Race and Rally. Within the Notice of Race for the event, the Prescriptions and Special Regulations of Yachting Australia were referenced as a governing document. Entries to the event were required to submit; • Verification of stability • Verification of construction requirements The stability requirements for entries in the Fremantle to Bali Rally 2015 were outlined in Appendix A of the NOR as follows. • ORCi Stability Index off 115 or greater. • An ISO 12217-2 Category A assessment with a Stix > 35. 3.3 2016 Pittwater to Coffs Race The 2016 Pittwater to Coffs Race is a Category 2 race open to multihull entries. Within the Notice of Race for the event, the current versions of the Prescriptions and Special Regulations of Yachting Australia were referenced as a governing document. The stability requirements for entries in the 2016 Pittwater to Coffs race are outlined in Appendix B of the NOR as follows. © 2015 Naval Architecture and Marine Solutions 6 Multihull Design, Construction and Flotation • Multihulls must comply with the YA SR 2013 ‐17 with the exception of SR 3.03 which has been deleted pending amendment by YA. • Until such time as SR 3.03 has been amended to specifically address multihull construction aspects the requirements below shall apply. Hull Construction Standards • A signed declaration must be provided by a naval architect, the builder, or other person familiar with the requirements for the design and construction of multihulls identifying the: a) Standard(s) or Classification Society Rules to which the hull panels and internal structure of the vessel have been constructed;
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