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Dynamic interaction of the breaking waves and inverted sailing yachts: explaining the efficacy of mast height retention relative to vertical centre of gravity

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Binns, JR and Brandner, PA (2008) Dynamic interaction of the breaking waves and inverted sailing yachts: explaining the efficacy of mast height retention relative to vertical centre of gravity. Ocean Engineering, 35 (17-18). pp. 1759-1768. ISSN 0029-8018

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Abstract

The ability of a sailing yacht to re-right due to the effect of a breaking wave is investigated experimentally. Free and constrained physical models with varying mast height and centre of gravity were tested. To investigate the influence of retained mast height on sway force and roll moment, models were constrained by attachment to a force balance for sway motion tests in calm water and stationary tests in regular and breaking waves. Free model testing, with varying mast height and centre of gravity position, were carried out in breaking waves. For these tests, model motions in six degrees of freedom were measured using photogrammetry. The constrained tests showed that while the mast height had little effect on forces when stationary in waves it had a large effect when in sway motion. As models experience large sway motions when subject to a breaking wave the mast remnant plays a critical role in re-righting dynamics. This work demonstrates that re-righting probability is more dependent on mast height retention and wave characteristics than vertical centre of gravity. This conclusion has direct implications on re-righting safety assessment as the dominant design feature in most safety standards is the vertical centre of gravity.

Item Type: Article
Keywords: Sailing yacht safety, experimental hydrodynamics, capsize, re-righting
Journal or Publication Title: Ocean Engineering
Page Range: pp. 1759-1768
ISSN: 0029-8018
Identification Number - DOI: 10.1016/j.oceaneng.2008.08.013
Additional Information: The definitive version is available at http://www.sciencedirect.com
Date Deposited: 22 Apr 2009 04:21
Last Modified: 18 Nov 2014 03:58
URI: http://eprints.utas.edu.au/id/eprint/8612
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