Hydrodynamics of large motor yachts: Past experience and future developments
Author Gaillarde, G., Toxopeus, S.L., Verwoest, T.F. and Hooijmans, P.M.
Title Hydrodynamics of large motor yachts: Past experience and future developments
Conference/Journal ATMA - Association Technique Maritime et Aeronautique, Paris, France
Month June
Year 2004

Abstract
The paper reviews the trends in tested designs over the last 15 years and highlights the lessons learned in the course of a long history of tests at MARIN for this type of vessels. It discusses the basics of motor yacht performance in calm water, manoeuvring and seakeeping and the techniques to investigate them in a numerical and experimental way.

The paper finally highlights future (hydrodynamic) developments that could be made to enhance further the comfort and performance of motor yachts. Use of podded propulsion, bulbous bow or trim wedges, manoeuvrability at low speed, development of better controls for steering and rolling in transit and at anchor, development of combined rudder-fin controls, use of rudder roll control are presented.

For luxury motor yachts, aesthetics, comfort and operability are of major importance. Designers and shipyards have to meet the challenge of realising the owner’s dream, but at the same time they have to work within technical and financial constraints. Aesthetics of the superstructure and the profile of the yacht must go hand-in-hand with technical requirements related to the expected operation of the ship. A yacht owner must be confident that his vessel can sail freely and safely in any part of the world and that it will also be comfortable and be able to realise the required range and speed.

The Maritime Research Institute Netherlands (MARIN) has a large track record with respect to the hydrodynamic research on motor yachts. This is partly due to the fact that a large number of yards dedicated to yacht business is present in The Netherlands, sometimes called the Yacht Valley. Every year different motor yacht designs are investigated with respect to their powering, seakeeping and manoeuvring performances.

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