“Het ontwerpen van kiel en roer”, by Peter van Oossanen, Published in “Vademecum van de zeilsport”, July 1988, pp. 1140-1-30 (ID No. 5736).
This paper (in Dutch) describes the process involved in choosing the main design variables of the keel and the rudder of sailing yachts such as: lateral area, aspect ratio, taper ratio, sweep angle, section shape, etc. The application of winglets on keels and rudders to augment side force and reduce drag is also covered.