Seakeeping Predictions for a 100-knot yacht

By:
D. Schleicher, P.E. Donald L. Blount and Associates, Inc., USA
J. Bowles, Donald L. Blount and Associates, Inc., USA

This paper explores the seakeeping characteristics of high speed craft in a macroscopic sense using data and information available in the public domain for high-speed, hard-chine hull forms. A brief description of the term seakeeping is provided, and standard references providing limits for vessel motions, crew and passenger fatigue, and injury are identified and discussed. A method will be presented to apply analytical design tools to evaluate the seakeeping performance of the vessel in the concept design phase. A method to estimate the maximum sea state in which a vessel can operate unrestricted is provided, and basic seakeeping criteria will be defined to allow a designer to estimate the speed-wave height limits for comfortable operation in a seaway.

The method will be illustrated using a luxury yacht capable of 100 knots as an example. DLBA has previously explored the technical feasibility of a 100-knot yacht using data available within the public domain, examining the state-of-the-art relationship between weight, power and speed for hard chine hull forms. Both structural studies and propulsion studies have been presented to date. In addition to the 100-knot speed requirement, the vessel must have appropriate ride quality to be a true yacht with creature comforts and accouterment. Key to the performance of the vessel is its ability to handle seas at high speeds. Therefore, excellent seakeeping characteristics are a must.

In case you would like to receive more information or discuss about this subject, please contact Jeffrey Bowles