Pitch reduction in transit by using stabiliser fins
Author Gaillarde, G.
Title Pitch reduction in transit by using stabiliser fins
Conference/Journal the Modern Yacht - RINA conference, Southampton
Year 2003

The quest for optimum comfort onboard motor yachts has been a rather strong drive for research and development, see [1] and [2]. During the last twenty years a dramatic increase in size and improvement in outfitting and building qualities were observed, with more luxurious and large equipment being brought onboard. The same quest for endeavouring onboard comfort also applied to hydrodynamics; shipyards and ship designers still struggling to reach the “floating island”concept in terms of motions (motion down - comfort up).
With increased ship length and range of operation, large motor yachts are also increasing the potential to meet harsh environment during their lifetime, which they should withstand without any trouble, meaning maximum safety and seaworthiness.
The present paper will not deal with extreme sea states and safety issues, even thougth very interesting, but will concentrate on a new innovative way to increase comfort in “light” cruising condition.
In December 2002, Amels Holland Shipyard, located in Makkum, The Netherlands, proposed together with Quantum Controls B.V. to try to reduce the pitch motions of their new built 60 m motor yacht. The idea was to use the two pairs of stabiliser fins that were already selected and fitted on the model. This idea was tried in the course of standard seakeeping model tests that were performed in the Seakeeping and Manoeuvring Basin (SMB) at MARIN. The results of the tests are presented and discussed in the following.

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