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

Review of Multihull Design, Construction and Flotation Requirements

15069-9-27

Revision

By

S.R.

Date

Description of change

Checked

1

03.11.15

Draft Issue

S.B.

_______________________
Shaun Ritson

Naval Architect
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
ABN: 43 954 607 498

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TABLE OF CONTENTS

DOCUMENT CHANGE CONTROL ...........................................................................................................2 12
INTRODUCTION ............................................................................................................................4 YA SPECIAL REGULATIONS 2013-16............................................................................................5

2.1 2.2
DESIGN AND CONSTRUCTION .............................................................................................................5 STABILITY AND FLOTATION...............................................................................................................5

345
EXISTING REQUIREMENTS OF ORGANISING AUTHORITIES......................................................6

3.1

2013 BALI RACE AND RALLY.............................................................................................................6

2015 BALI RACE AND RALLY.............................................................................................................6 2016 PITTWATER TO COFFS RACE......................................................................................................6 RORC RACES...............................................................................................................................7
3.2 3.3 3.4

STANDARDS APPLICABLE TO MULTIHULLS AND CURRENT PRACTICE ......................................8

4.1

ISO 12215-7..............................................................................................................................8

DNV-GL RULES............................................................................................................................9 ISO 12217-1:2013 .....................................................................................................................9 CURRENT PRACTICE........................................................................................................................9
4.2 4.3 4.4

FINDINGS AND RECOMMENDATIONS........................................................................................10

5.1 5.2
FINDINGS.................................................................................................................................. 10 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

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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.

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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.

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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.

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••

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; and, b) Standard(s) used to assess the global strength of the vessel's structure; The declaration must also confirm that the design, build and any subsequent structural modifications are consistent with the requirements of ISO 12215 Category B.

••

The declaration must include the date, the qualifications of the person making the declaration, and the details of any relevant related corporate entities.

3.4 RORC Races

RORC organises a number of offshore races throughout the calendar year that are open to multihulls. Their 2015 Notice of Race stipulates that the races will be governed by a number rules and regulations. Amongst them is the 2014-2015 ISAF Offshore Special Regulations (OSR).

On the subject of hull construction standards applicable to multihulls, ISAF Offshore Special regulations require;

Hull Construction Standards (Scantlings)

•

A monohull with the earliest of Age or Series Date before the 1 January 2010 shall comply with 3.03.1, 3.03.2 and 3.03.3 above or with appendix M to these OSR. A multihull shall comply with appendix M to these OSR.

Appendix M of OSR specifies which standards may be applied to confirm structural compliance. These include ISO 12215, ABS or EC Recreational Craft Directive.

ISAF Offshore Special regulations requirements in relation to stability and flotation of multihulls are the practically the same as those within the YA Special regulations.

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4

Standards Applicable to Multihulls and Current Practice

4.1 ISO 12215-7

The ISO 12215 series of standards applies to the design and construction of small craft. There are nine parts to the standard.

ISO 12215-7 Small craft - Hull construction and scantlings - Part 7: Scantling determination of multihulls is still in a draft form and is not yet a harmonised EN standard.

ISAF has a published list of notified bodies that are able to carry out structural assessments and issue CE certificates for the European Recreational Craft Directive.

HPi Verification Services Ltd is one of these recognised bodies. HPi have advised;

“We consider the current issue of ISO 12215-7 as being adequate to satisfy the requirements of the EU Recreational Craft Directive, for CE marking, in that the figures that it produces are in proportion with other standards/rules and our expectation. As it is not yet a harmonised EN standard, other EU certifiers (notified bodies) are entitled to have a different opinion. I know some have a policy of never using draft standards but we are not alone in accepting structures to this one.”

The Australian Maritime Safety Authority regulates commercial vessels operating within Australia. AMSA publish the National Code for Commercial Vessels which are the regulations applicable to domestic commercial vessels.

The NSCV Part C, Section 3 Construction stipulates the various standards and regulations that are applicable to the design and construction of commercial vessels.

Chapter 3.4 permits the application of specified standards in the ISO 12215 series to specified craft engaged in light operations. ISO 12215-7 Small craft - Hull construction and scantlings - Part 7: Scantling determination of multihulls is one of the ISO 12215 standards that are deemed to satisfy the requirements for a domestic commercial vessel operating in specific operations (light operations, hire and drive).

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4.2 DNV-GL Rules

Another of the list of notified bodies published by ISAF is the Classification Society DNV-GL. DNV-GL has published a document titled “Provisions for the structural plan review of fast sailing catamarans”. This document outlines the basis for assessing the structural integrity for a fast sailing catamaran to RCD and ISAF Offshore Special Regulations.

DNV-GL applies the following standards for making these assessments;
Rules for Classification and Construction, I Ship Technology, 3 Special Craft ,1 High Speed Craft Rules for Classification and Construction, I Ship Technology, 3 Special Craft ,7 Guidelines for the Structural Design of Racing Yachts ≥ 24 m

4.3 ISO 12217-1:2013

Stability and buoyancy requirement applicable to both monohulls and multihulls are detailed in ISO 12217- 1:2013 Small craft - Stability and buoyancy assessment and categorization - Part 1: Non-sailing boats of hull length greater than or equal to 6 m.

This code outlines the requirements for Design Category A which Special Regulations require for both category 1 and Category 2 races.

4.4 Current Practice

Spirited Designs supply designs for sailing catamarans to the Australian market. They indicated that they can supply a CE compliant kit package for a particular design, but that for a racing multihull they would recommend their standard kit which is lighter than the CE engineered structure.

Their standard structure is engineered by ATL Composites but to their own recreational standards. Spirited Designs indicated that survey/ charter/CE classifications all require additional reinforcement to meet these codes.

Another multihull designer indicated ISO 12217 is widely used for multihull stability and normally required for CE certification. They suggested if they were to start a new CE-certified cruising cat, they would use the draft 12215-7. In the past, they have also applied DNV/GL for global loads or ABS offshore racing yachts for panel pressures, or a combination of the two and it has been accepted by CE. This particular designer does not design specifically for the Australian market.

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5

Findings and Recommendations

5.1 Findings

1. 2. 3. 4.
The current YA Special regulations place no structural or stability requirements on multihulls competing in Category 1 and Category 2 races. Local organising authorities have, in some instances, required structural compliance to some standard as a condition of entry to an event (Coffs Pittwater). ISAF OSR requires multihulls competing in Category 1 and Category 2 events to be compliant with published structural standards. There are Classification rules and International Standards (draft form) that are currently accepted for structural assessments of multihulls both locally and internationally.
5. 6.
There are International Standards that are currently accepted for sailing multihull stability assessments. There have been no reports of construction or stability related incidents relating to multihulls competing in local Category 1 and Category 2 races that have become available during this review.

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5.2 Recommendations

1.

The YA Special Regulations be updated to include hull design and construction requirements applicable to multihulls aligned with Appendix M of the OSR.

The existing Special Regulations prescribe minimum design and construction standards for monohull yachts competing in Cat 1 and Cat 2 races. The assumption is that this requirement has been adopted with the aim of achieving a minimum level of safety. It would seem reasonable that this same level of safety should be required of multihulls competing in the same events.

There are Classification rules and International Standards (draft form) that are currently accepted for structural assessments of multihulls both locally and internationally.

This requirement may become an obstacle for entries of locally designed vessels, as indicated by Spirited Designs. In that instance, a more generic alternative along the lines of that applied in the Pittwater to Coffs race could be included as deemed to satisfy solution.

•

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; and, b) Standard(s) used to assess the global strength of the vessel's structure; The declaration must also confirm that the design, build and any subsequent structural modifications are consistent with the requirements of the applied standard(s).

••

The declaration must include the date, and the qualifications of the person making the declaration, and the details of any relevant related corporate entities.

2.

The YA Special Regulations relating to flotation and buoyancy of multihulls remain unchanged.

The existing Special Regulations already closely align with the OSR in relation to flotation and buoyancy. Whilst it appears to be an anomaly that flotation and buoyancy requirements are in place for multihulls and not for monohulls, it is noted that this same anomaly exists within ISO 12217 for category A yachts.

3.

A dialogue is started with ISAF and stakeholders to establish whether ISO 12217 category A compliance should be required for multihulls competing in Cat 1 and Cat 2 races.

The existing Special Regulations prescribe minimum stability standards for monohull yachts competing in Cat 1 and Cat 2 races. The assumption is that this requirement has been adopted with the aim of achieving a minimum level of safety. It would seem reasonable that this same level of safety should be required of a multihulls competing in the same events.

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There are International Standards (ISO 12217-2) that are currently accepted for stability assessments of both Category A monohulls and multihulls.

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Appendix A – ISAF Offshore Special Regulations

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Appendix B –Pittwater to Coffs Multihull Requirements

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Appendix C –YA SR Stability and Flotation - Multihulls

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Appendix D –OSR Stability and Flotation - Multihulls

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