The increase ·of the market for high-speed vessels and the related technical requirements have been responsable for the search of better understanding and development of reliable tools for the estimation and prediction of the seakeeping behavior. As a result, a research program on high-speed monohulls was created whose objectives are related to the improvement of computer and experimental techniques (towing tank and full scale tests) for evaluation of the vessels' characteristics in waves and the development of specific knowledge for design purposes.

The vessel, which has been chosen for this study, is a high-speed round-bilge monohull. This initial work has been divided in three steps that is, a computer analysis has been undertaking by employing of the traditional "strip method", the construction of a fiberglass model for towing tank tests and, finally, a full scale experiment has been carried out. The description of the model and full scale experimental procedure are presented, the transfer functions and statistics compared and the results analyzed and explained.

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