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Dynamic knockdown of canting keel yachts in breaking waves


Binns, JR and Palos, O and Brandner, PA and Thomas, GA, Dynamic knockdown of canting keel yachts in breaking waves, Marine Technology and SNAME News, 46, (2) pp. 99-106. ISSN 1945-3582 (2009) [Refereed Article]

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Copyright 2009 by The Society of Naval Architects and Marine Engineers

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Yacht canting keel configurations have been developed to maximize the available righting moment by rotating their keel bulb to windward. Regulatory authorities have been required to establish rules covering the design and operation of such systems; however, significant dynamic investigations into their behavior have not been performed. This paper presents results trom a Iheoretical and experimental investigation into the dynamic stability of canting keel sailing yachts when experiencing a knockdown by large breaking waves. Towing tank experiments were conducted on a yacht model with a fixed keel and two canted keel configurations, beam-on to large solitary breaking waves. The motion of the model during the tests was recorded by four video cameras and analyzed using photogrammetry. A comparison of the hydrostatic predictions and experimental results indicate that the traditional GZ approach of assessing the energy required to heel may not be appropriate for yachts with canting keels. In addition, a correlation of the experimental results with the ISOstability indexhighlights that this indexmay be unsuitable for categorizingyachts with cantingkeels with respect to their ability to recover aftera knockdown event.

Item Details

Item Type:Refereed Article
Keywords:capsize; hydrodynamics (general); keels; model testing; safety; sailing yachts; stability
Research Division:Engineering
Research Group:Maritime engineering
Research Field:Ship and platform structures (incl. maritime hydrodynamics)
Objective Division:Manufacturing
Objective Group:Computer, electronic and communication equipment
Objective Field:Integrated systems
UTAS Author:Binns, JR (Professor Jonathan Binns)
UTAS Author:Brandner, PA (Professor Paul Brandner)
UTAS Author:Thomas, GA (Professor Giles Thomas)
ID Code:57686
Year Published:2009
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2009-08-07
Last Modified:2012-04-20
Downloads:7 View Download Statistics

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