Design of a Sailing Yacht with a Bow Rudder. International Conference on the211 Modern Yacht. Held in Portsmouth, England on March 18-19, 1998. Papers

摘要

Looking at the design of yachts, like those which competed in the latest Vendee211u001eGlobe Challenge and the B.O.C. Challenge, the most striking features of these 211u001eyachts seems to be their wide aft bodies. Important reasons for the designer to 211u001echoose such a hull form could be the creation of a flat and wide bottom of the 211u001ehull aft. so that the yacht may reach high speeds at downwind courses and the 211u001epossible drastic reduction of wetted surface when heeled. Consequently, the 211u001edesigner is usually forced to use multiple rudders, because a single rudder would 211u001ecome out of the water when a yacht like this is heeled. The possible additional 211u001eresistence due to this rudder configuration, compared to a single rudder, is a 211u001edisadvantage that has to be addressed. An alternative might be the use of a 211u001esingle bow rudder. The question is whether this is feasible or not. In the 211u001epresent study a comparison between these two design options was made for one 211u001eparticular design. Issues such as course stability and manoeuvrability were also 211u001etaken into account. To explore the difference in performance of the two designs, 211u001etank tests were performed at the Ship Hydromechanics Laboratory in Delft. A 211u001equalitative manoeuvring test was made as well. This paper will present the 211u001eresults of this comparison in some detail.