Hostname: page-component-8448b6f56d-gtxcr Total loading time: 0 Render date: 2024-04-23T15:56:27.899Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Beukelman, W. & Keuning, J. A. 1975 The influence of fin-keel sweep-back on the performance of sailing yachts. Fourth HISWA Symp. on Yacht Architecture, pp. 7–51.
Hoerner, S. F. 1965 Fluid-dynamic Drag. Hoerner Fluid Dynamics.
Hoerner, S. F. & Borst, H. V. 1975 Fluid-dynamic Lift. Hoerner Fluid Dynamics.
Hopkins, E. J. & Sorensen, N. E. 1956 A device for vortex-core measurements. J. Aero. Sci. 23, 396–398.Google Scholar
Joubert, P. N., Wang, M. H. & Clayton, R. M. F. 1986 Wind tunnel tests of the winged keel from Australia II. Dept. of Mech. Engng, University of Melbourne. 45 pp.Google Scholar
Labrujere, Th. E., Loeve, W. & Slooff, J. W. 1970 An approximate method for the calculation of the pressure distribution on wing-body combinations at sub-critical speeds. National Aerospace Laboratory, Rep. No. NLR MP700144.
Oossanen, P. Van 1979 Theoretical estimation of the influence of some main design factors on the performance of International twelve-metre class yachts. Fourth Chesepeake Sailing Yacht Symp. 27 pp.
Oossanen, P. Van 1981 A method for the calculation of resistance and side force of sailing yachts. Conference on Calculator and Computer-aided Design for Small Craft. Roy. Inst. Nav. Archit. 22 pp.Google Scholar
Oossanen, P. Van 1985 The development of the twelve-metre yacht Australia II. Seventh Chesepeake Sailing Yacht Symp., pp. 81–101.Google Scholar
Taylor, G. I. 1927 Across the Arctic Circle in Frolic, 1927. Roy. Cruising Club J., 1–18.Google Scholar
Whicker, L. F. & Fehlner, L. F. 1958 Free-stream characteristics of a family of low-aspect ratio, all movable control surfaces for application to ship design. David W. Taylor Naval Ship Research and Development Center, Rep. No. 933.
Whitcomb, R. T. 1976 A design approach and selected wind-tunnel results at high subsonic speeds for wing-tip mounted winglets. NASA Tech. Note D-8260.