In the summer of 1983, in the months leading up to the 25th America's Cup competition, a storm of controversy gathered over what is today known as the famous (or infamous) "winged keel" on the Australian boat, AUSTRALIA II. The controversy continues to this day, as summarized in a technically thorough discussion of who can actually be credited for this industry-changing keel design, and exactly how the design evolved. 

Winged Victory








Click here to read the article as it appeared in Professional Boatbuilder. 

The Royal Institution of Naval Architects is extending its first notice and call for papers for its INNOV'SAIL 2010 Conference to be held June 30 - July 1, 2010 in Lorient, France.

Papers are invited on all aspects of yacht design, including:
• Innovative design for performance
• Aerodynamics
• Design of sails, masts, rigging.
• Hydrodynamics.
• Design of hulls, appendages.
• Structure and materials.
• Fluid structure interaction.
• CFD Validation.
• New experimental techniques.
• Performance enhancement in general.

Click here for a PDF of the First Notice and Call for Papers.

Cover Story in Feb. 2008 Physics Today

"Sails and keels, like airplane wings, exploit Bernulli's principle. Aerodynamic and hydrodamic insights help designers create faster sailboats."
This article was written by Bryon D. Anderson, an experimental nuclear physicist and chairman of the physics department at Kent State University in Kent, Ohio. He is also an avid sailor who lectures and writes about the intersection between physics and sailing. 
Click here to view the article online (this link take you to the article on the American Institute of Physic's website):

Operator Guidance Based on Assessing the Wind-Heel Angle
Relationship of Traditionally-Rigged Sailing Vessels

Pride of Batlimore II

Bruce Johnson, U. S. Naval Academy, Co-chair, SNAME Panel O-49, (FL)
Jan C. Miles, Captain, Pride of Baltimore II, (V)
William C. Lasher, Penn State Erie, The Behrend College, Chair, SNAME Panel SC-2, (M)
John Womack, Chesapeake Shipbuilding, Co-chair, SNAME Panel O-49, (M)


This paper reports on a series of projects funded by the Society of Naval Architects and Marine Engineers (SNAME) T&R Steering Committee. Analysis of underway data recorded on the Pride of Baltimore II in conjunction with CFD modeling has shown promising results on achieving useful wind-heel stability guidance. The resulting volumes of data were then entered into spreadsheets to develop the vessel’s wind-heel stability characteristics. The current method of analysis involves the concept of Significant Heel Angle Analysis, i.e. the average of the highest one third of the heel angles obtained by sorting the data records by decreasing heel angle. This concept appears to be independent of whether or not a mast motion correction is applied to the wind anemometer data. Significant heel analysis also avoids the skew in the averages caused by small heel angle analysis. Most important, these characteristics can then be conveyed to the master in simple color coded charts. 

Click here to view/download the PDF file. 


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