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The development of the winged keel for twelve-metre yachts

Published online by Cambridge University Press:  21 April 2006

P. Van Oossanen  and
P. N. Joubert
P. Van Oossanen
Affiliation:
Maritime Research Institute, Wageningen, The Netherlands
P. N. Joubert
Affiliation:
Department of Mechanical Engineering, University of Melbourne, Victoria 3052, Australia
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Abstract

In this paper the authors present a numerical and experimental analysis of the winged keel originally developed for the International twelve-metre class yacht Australia II that won the America's Cup in 1983. After briefly explaining why this keel was evolved in 1981, some basic considerations are presented relating keel performance to various design parameters. The results of numerical flow analyses and wind-tunnel measurements on a model of a winged keel are then presented and compared. The differences between the performance with and without winglets fitted to the keel are discussed. The fitting of winglets appreciably enhances the performance of a low-aspect-ratio lifting surface such as the keel of a twelve-metre yacht.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 173 , December 1986 , pp. 55 - 71
Copyright
© 1986 Cambridge University Press

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