Library Open Repository

Dynamic knockdown of canting keel yachts in breaking waves

Downloads

Downloads per month over past year

Binns, JR and Palos, O and Brandner, PA and Thomas, GA (2009) Dynamic knockdown of canting keel yachts in breaking waves. Marine Technology, 46 (2). pp. 99-106. ISSN 0025-3316

[img] PDF
BinnsPalosBrandnerThomas_2009_sname200904.pdf | Request a copy
Full text restricted
Available under University of Tasmania Standard License.

Official URL: http://www.sname.org

Abstract

Yacht canting keel configurations have been developed to maximise 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 behaviour have not been performed. This paper presents results from a theoretical 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 analysed 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 ISO stability index highlights that this index may be unsuitable for categorising yachts with canting keels with respect to their ability to recover after a knockdown event.

Item Type: Article
Keywords: capsize hydrodynamics (general) keels model testing safety sail yachts stability
Journal or Publication Title: Marine Technology
Page Range: pp. 99-106
ISSN: 0025-3316
Date Deposited: 22 Apr 2009 03:36
Last Modified: 18 Nov 2014 03:58
URI: http://eprints.utas.edu.au/id/eprint/8610
Item Statistics: View statistics for this item

Repository Staff Only (login required)

Item Control Page Item Control Page