In this paper the development of the 12 Metre Class Yacht "Australia II" is described as it took place at the Netherlands Ship Model Basin in Wageningen, The Netherlands, under the direction of Ben Lexcen, An account is given of the adopted design process and the technology involved. Particular attention is given to the adopted towing tank procedures and calculation techniques for predicting performance, A description is also given of the computer monitoring system used to evaluate "Australia II's" performance while sail-tuning and racing in Australia and Newport in 1982 and 1983.

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